2016-01-18 Sandra Loosemore <sandra@codesourcery.com>

	gcc/
	* doc/invoke.texi (Invoking GCC): Add new section to menu.
	(Option Summary): Update to reflect new section and moved options.
	(C++ Dialect Options): Move -fstats to new section.
	(Debugging Options): Move all dump, statistics, and other GCC
	developer options to new section.  Rewrite section introduction
	and re-order remaining options to put the more basic ones first.
	(Optimization Options): Move -fira-verbose and -flto-report* to
	new section.
	(Developer Options): New section incorporating moved options.
	* doc/cppopts.texi (-dM): Update cross-reference.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@232541 138bc75d-0d04-0410-961f-82ee72b054a4

3 files changed, 1449 insertions, 1403 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index ffb8c2a2bbf..de6e1ede674 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,16 @@
+2016-01-18  Sandra Loosemore <sandra@codesourcery.com>
+
+	* doc/invoke.texi (Invoking GCC): Add new section to menu.
+	(Option Summary): Update to reflect new section and moved options.
+	(C++ Dialect Options): Move -fstats to new section.
+	(Debugging Options): Move all dump, statistics, and other GCC
+	developer options to new section.  Rewrite section introduction
+	and re-order remaining options to put the more basic ones first.
+	(Optimization Options): Move -fira-verbose and -flto-report* to
+	new section.
+	(Developer Options): New section incorporating moved options.
+	* doc/cppopts.texi (-dM): Update cross-reference.
+
 2016-01-18  Richard Henderson  <rth@redhat.com>
 
 	PR target/69176
diff --git a/gcc/doc/cppopts.texi b/gcc/doc/cppopts.texi
index f7142406498..c5f919a5cf2 100644
--- a/gcc/doc/cppopts.texi
+++ b/gcc/doc/cppopts.texi
@@ -710,7 +710,7 @@ will show all the predefined macros.
 
 If you use @option{-dM} without the @option{-E} option, @option{-dM} is
 interpreted as a synonym for @option{-fdump-rtl-mach}.
-@xref{Debugging Options, , ,gcc}.
+@xref{Developer Options, , ,gcc}.
 
 @item D
 @opindex dD
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 66861937d81..a1debf19074 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -138,7 +138,7 @@ only one of these two forms, whichever one is not the default.
 * Diagnostic Message Formatting Options:: Controlling how diagnostics should
                         be formatted.
 * Warning Options::     How picky should the compiler be?
-* Debugging Options::   Symbol tables, measurements, and debugging dumps.
+* Debugging Options::   Producing debuggable code.
 * Optimize Options::    How much optimization?
 * Instrumentation Options:: Enabling profiling and extra run-time error checking.
 * Preprocessor Options:: Controlling header files and macro definitions.
@@ -149,6 +149,8 @@ only one of these two forms, whichever one is not the default.
                         Where to find the compiler executable files.
 * Code Gen Options::    Specifying conventions for function calls, data layout
                         and register usage.
+* Developer Options::   Printing GCC configuration info, statistics, and
+                        debugging dumps.
 * Submodel Options::    Target-specific options, such as compiling for a
                         specific processor variant.
 * Spec Files::          How to pass switches to sub-processes.
@@ -199,7 +201,7 @@ in the following sections.
 -fno-optional-diags  -fpermissive @gol
 -fno-pretty-templates @gol
 -frepo  -fno-rtti -fsized-deallocation @gol
--fstats  -ftemplate-backtrace-limit=@var{n} @gol
+-ftemplate-backtrace-limit=@var{n} @gol
 -ftemplate-depth=@var{n} @gol
 -fno-threadsafe-statics  -fuse-cxa-atexit @gol
 -fno-weak  -nostdinc++ @gol
@@ -313,71 +315,18 @@ Objective-C and Objective-C++ Dialects}.
 -Wdeclaration-after-statement -Wpointer-sign}
 
 @item Debugging Options
-@xref{Debugging Options,,Options for Debugging Your Program or GCC}.
-@gccoptlist{-d@var{letters}  -dumpspecs  -dumpmachine  -dumpversion @gol
--fchecking -fdbg-cnt-list -fdbg-cnt=@var{counter-value-list} @gol
--fdisable-ipa-@var{pass_name} @gol
--fdisable-rtl-@var{pass_name} @gol
--fdisable-rtl-@var{pass-name}=@var{range-list} @gol
--fdisable-tree-@var{pass_name} @gol
--fdisable-tree-@var{pass-name}=@var{range-list} @gol
--fdump-noaddr -fdump-unnumbered -fdump-unnumbered-links @gol
--fdump-translation-unit@r{[}-@var{n}@r{]} @gol
--fdump-class-hierarchy@r{[}-@var{n}@r{]} @gol
--fdump-ipa-all -fdump-ipa-cgraph -fdump-ipa-inline @gol
--fdump-passes @gol
--fdump-statistics @gol
--fdump-tree-all @gol
--fdump-tree-original@r{[}-@var{n}@r{]}  @gol
--fdump-tree-optimized@r{[}-@var{n}@r{]} @gol
--fdump-tree-cfg -fdump-tree-alias @gol
--fdump-tree-ch @gol
--fdump-tree-ssa@r{[}-@var{n}@r{]} -fdump-tree-pre@r{[}-@var{n}@r{]} @gol
--fdump-tree-ccp@r{[}-@var{n}@r{]} -fdump-tree-dce@r{[}-@var{n}@r{]} @gol
--fdump-tree-gimple@r{[}-raw@r{]} @gol
--fdump-tree-dom@r{[}-@var{n}@r{]} @gol
--fdump-tree-dse@r{[}-@var{n}@r{]} @gol
--fdump-tree-phiprop@r{[}-@var{n}@r{]} @gol
--fdump-tree-phiopt@r{[}-@var{n}@r{]} @gol
--fdump-tree-backprop@r{[}-@var{n}@r{]} @gol
--fdump-tree-forwprop@r{[}-@var{n}@r{]} @gol
--fdump-tree-nrv -fdump-tree-vect @gol
--fdump-tree-sink @gol
--fdump-tree-sra@r{[}-@var{n}@r{]} @gol
--fdump-tree-forwprop@r{[}-@var{n}@r{]} @gol
--fdump-tree-fre@r{[}-@var{n}@r{]} @gol
--fdump-tree-vtable-verify @gol
--fdump-tree-vrp@r{[}-@var{n}@r{]} @gol
--fdump-tree-split-paths@r{[}-@var{n}@r{]} @gol
--fdump-tree-storeccp@r{[}-@var{n}@r{]} @gol
--fdump-final-insns=@var{file} @gol
--fcompare-debug@r{[}=@var{opts}@r{]}  -fcompare-debug-second @gol
--feliminate-dwarf2-dups -fno-eliminate-unused-debug-types @gol
--feliminate-unused-debug-symbols -femit-class-debug-always @gol
--fenable-@var{kind}-@var{pass} @gol
--fenable-@var{kind}-@var{pass}=@var{range-list} @gol
--fdebug-types-section -fmem-report-wpa @gol
--fmem-report -fpre-ipa-mem-report -fpost-ipa-mem-report @gol
--fopt-info @gol
--fopt-info-@var{options}@r{[}=@var{file}@r{]} @gol
--fprofile-report @gol
--frandom-seed=@var{string} -fsched-verbose=@var{n} @gol
--fsel-sched-verbose -fsel-sched-dump-cfg -fsel-sched-pipelining-verbose @gol
--fstack-usage  -ftime-report -fvar-tracking @gol
--fvar-tracking-assignments  -fvar-tracking-assignments-toggle @gol
--g  -g@var{level}  -gtoggle  -gcoff  -gdwarf-@var{version} @gol
+@xref{Debugging Options,,Options for Debugging Your Program}.
+@gccoptlist{-g  -g@var{level}  -gcoff  -gdwarf-@var{version} @gol
 -ggdb  -grecord-gcc-switches  -gno-record-gcc-switches @gol
 -gstabs  -gstabs+  -gstrict-dwarf  -gno-strict-dwarf @gol
 -gvms  -gxcoff  -gxcoff+ -gz@r{[}=@var{type}@r{]} @gol
--fno-merge-debug-strings -fno-dwarf2-cfi-asm @gol
--fdebug-prefix-map=@var{old}=@var{new} @gol
+-fdebug-prefix-map=@var{old}=@var{new} -fdebug-types-section @gol
+-feliminate-dwarf2-dups -fno-eliminate-unused-debug-types @gol
 -femit-struct-debug-baseonly -femit-struct-debug-reduced @gol
 -femit-struct-debug-detailed@r{[}=@var{spec-list}@r{]} @gol
--print-file-name=@var{library}  -print-libgcc-file-name @gol
--print-multi-directory  -print-multi-lib  -print-multi-os-directory @gol
--print-prog-name=@var{program}  -print-search-dirs  -Q @gol
--print-sysroot -print-sysroot-headers-suffix @gol
--save-temps -save-temps=cwd -save-temps=obj -time@r{[}=@var{file}@r{]}}
+-feliminate-unused-debug-symbols -femit-class-debug-always @gol
+-fno-merge-debug-strings -fno-dwarf2-cfi-asm @gol
+-fvar-tracking -fvar-tracking-assignments}
 
 @item Optimization Options
 @xref{Optimize Options,,Options that Control Optimization}.
@@ -407,14 +356,14 @@ Objective-C and Objective-C++ Dialects}.
 -fira-algorithm=@var{algorithm} @gol
 -fira-region=@var{region} -fira-hoist-pressure @gol
 -fira-loop-pressure -fno-ira-share-save-slots @gol
--fno-ira-share-spill-slots -fira-verbose=@var{n} @gol
+-fno-ira-share-spill-slots @gol
 -fisolate-erroneous-paths-dereference -fisolate-erroneous-paths-attribute @gol
 -fivopts -fkeep-inline-functions -fkeep-static-functions @gol
 -fkeep-static-consts -flive-range-shrinkage @gol
 -floop-block -floop-interchange -floop-strip-mine @gol
 -floop-unroll-and-jam -floop-nest-optimize @gol
 -floop-parallelize-all -flra-remat -flto -flto-compression-level @gol
--flto-partition=@var{alg} -flto-report -flto-report-wpa -fmerge-all-constants @gol
+-flto-partition=@var{alg} -fmerge-all-constants @gol
 -fmerge-constants -fmodulo-sched -fmodulo-sched-allow-regmoves @gol
 -fmove-loop-invariants -fno-branch-count-reg @gol
 -fno-defer-pop -fno-function-cse -fno-guess-branch-probability @gol
@@ -548,6 +497,64 @@ Objective-C and Objective-C++ Dialects}.
 -fvisibility=@r{[}default@r{|}internal@r{|}hidden@r{|}protected@r{]} @gol
 -fstrict-volatile-bitfields -fsync-libcalls}
 
+@item Developer Options
+@xref{Developer Options,,GCC Developer Options}
+@gccoptlist{-d@var{letters}  -dumpspecs  -dumpmachine  -dumpversion @gol
+-fchecking -fdbg-cnt-list -fdbg-cnt=@var{counter-value-list} @gol
+-fdisable-ipa-@var{pass_name} @gol
+-fdisable-rtl-@var{pass_name} @gol
+-fdisable-rtl-@var{pass-name}=@var{range-list} @gol
+-fdisable-tree-@var{pass_name} @gol
+-fdisable-tree-@var{pass-name}=@var{range-list} @gol
+-fdump-noaddr -fdump-unnumbered -fdump-unnumbered-links @gol
+-fdump-translation-unit@r{[}-@var{n}@r{]} @gol
+-fdump-class-hierarchy@r{[}-@var{n}@r{]} @gol
+-fdump-ipa-all -fdump-ipa-cgraph -fdump-ipa-inline @gol
+-fdump-passes @gol
+-fdump-rtl-@var{pass} -fdump-rtl-@var{pass}=@var{filename} @gol
+-fdump-statistics @gol
+-fdump-tree-all @gol
+-fdump-tree-original@r{[}-@var{n}@r{]}  @gol
+-fdump-tree-optimized@r{[}-@var{n}@r{]} @gol
+-fdump-tree-cfg -fdump-tree-alias @gol
+-fdump-tree-ch @gol
+-fdump-tree-ssa@r{[}-@var{n}@r{]} -fdump-tree-pre@r{[}-@var{n}@r{]} @gol
+-fdump-tree-ccp@r{[}-@var{n}@r{]} -fdump-tree-dce@r{[}-@var{n}@r{]} @gol
+-fdump-tree-gimple@r{[}-raw@r{]} @gol
+-fdump-tree-dom@r{[}-@var{n}@r{]} @gol
+-fdump-tree-dse@r{[}-@var{n}@r{]} @gol
+-fdump-tree-phiprop@r{[}-@var{n}@r{]} @gol
+-fdump-tree-phiopt@r{[}-@var{n}@r{]} @gol
+-fdump-tree-backprop@r{[}-@var{n}@r{]} @gol
+-fdump-tree-forwprop@r{[}-@var{n}@r{]} @gol
+-fdump-tree-nrv -fdump-tree-vect @gol
+-fdump-tree-sink @gol
+-fdump-tree-sra@r{[}-@var{n}@r{]} @gol
+-fdump-tree-forwprop@r{[}-@var{n}@r{]} @gol
+-fdump-tree-fre@r{[}-@var{n}@r{]} @gol
+-fdump-tree-vtable-verify @gol
+-fdump-tree-vrp@r{[}-@var{n}@r{]} @gol
+-fdump-tree-split-paths@r{[}-@var{n}@r{]} @gol
+-fdump-tree-storeccp@r{[}-@var{n}@r{]} @gol
+-fdump-final-insns=@var{file} @gol
+-fcompare-debug@r{[}=@var{opts}@r{]}  -fcompare-debug-second @gol
+-fenable-@var{kind}-@var{pass} @gol
+-fenable-@var{kind}-@var{pass}=@var{range-list} @gol
+-fira-verbose=@var{n} @gol
+-flto-report -flto-report-wpa -fmem-report-wpa @gol
+-fmem-report -fpre-ipa-mem-report -fpost-ipa-mem-report @gol
+-fopt-info -fopt-info-@var{options}@r{[}=@var{file}@r{]} @gol
+-fprofile-report @gol
+-frandom-seed=@var{string} -fsched-verbose=@var{n} @gol
+-fsel-sched-verbose -fsel-sched-dump-cfg -fsel-sched-pipelining-verbose @gol
+-fstats  -fstack-usage  -ftime-report @gol
+-fvar-tracking-assignments-toggle -gtoggle @gol
+-print-file-name=@var{library}  -print-libgcc-file-name @gol
+-print-multi-directory  -print-multi-lib  -print-multi-os-directory @gol
+-print-prog-name=@var{program}  -print-search-dirs  -Q @gol
+-print-sysroot -print-sysroot-headers-suffix @gol
+-save-temps -save-temps=cwd -save-temps=obj -time@r{[}=@var{file}@r{]}}
+
 @item Machine-Dependent Options
 @xref{Submodel Options,,Machine-Dependent Options}.
 @c This list is ordered alphanumerically by subsection name.
@@ -2433,11 +2440,6 @@ to make deallocation faster.  Enabled by default under
 @option{-std=c++14} and above.  The flag @option{-Wsized-deallocation}
 warns about places that might want to add a definition.
 
-@item -fstats
-@opindex fstats
-Emit statistics about front-end processing at the end of the compilation.
-This information is generally only useful to the G++ development team.
-
 @item -fstrict-enums
 @opindex fstrict-enums
 Allow the compiler to optimize using the assumption that a value of
@@ -5694,12 +5696,28 @@ attribute.
 @end table
 
 @node Debugging Options
-@section Options for Debugging Your Program or GCC
+@section Options for Debugging Your Program
 @cindex options, debugging
 @cindex debugging information options
 
-GCC has various special options that are used for debugging
-either your program or GCC:
+To tell GCC to emit extra information for use by a debugger, in almost 
+all cases you need only to add @option{-g} to your other options.
+
+GCC allows you to use @option{-g} with
+@option{-O}.  The shortcuts taken by optimized code may occasionally
+be surprising: some variables you declared may not exist
+at all; flow of control may briefly move where you did not expect it;
+some statements may not be executed because they compute constant
+results or their values are already at hand; some statements may
+execute in different places because they have been moved out of loops.
+Nevertheless it is possible to debug optimized output.  This makes
+it reasonable to use the optimizer for programs that might have bugs.
+
+If you are not using some other optimization option, consider
+using @option{-Og} (@pxref{Optimize Options}) with @option{-g}.  
+With no @option{-O} option at all, some compiler passes that collect
+information useful for debugging do not run at all, so that
+@option{-Og} may result in a better debugging experience.
 
 @table @gcctabopt
 @item -g
@@ -5716,28 +5734,6 @@ refuse to read the program.  If you want to control for certain whether
 to generate the extra information, use @option{-gstabs+}, @option{-gstabs},
 @option{-gxcoff+}, @option{-gxcoff}, or @option{-gvms} (see below).
 
-GCC allows you to use @option{-g} with
-@option{-O}.  The shortcuts taken by optimized code may occasionally
-produce surprising results: some variables you declared may not exist
-at all; flow of control may briefly move where you did not expect it;
-some statements may not be executed because they compute constant
-results or their values are already at hand; some statements may
-execute in different places because they have been moved out of loops.
-
-Nevertheless it proves possible to debug optimized output.  This makes
-it reasonable to use the optimizer for programs that might have bugs.
-
-The following options are useful when GCC is generated with the
-capability for more than one debugging format.
-
-@item -gsplit-dwarf
-@opindex gsplit-dwarf
-Separate as much dwarf debugging information as possible into a
-separate output file with the extension .dwo.  This option allows
-the build system to avoid linking files with debug information.  To
-be useful, this option requires a debugger capable of reading .dwo
-files.
-
 @item -ggdb
 @opindex ggdb
 Produce debugging information for use by GDB@.  This means to use the
@@ -5745,15 +5741,17 @@ most expressive format available (DWARF 2, stabs, or the native format
 if neither of those are supported), including GDB extensions if at all
 possible.
 
-@item -gpubnames
-@opindex gpubnames
-Generate dwarf .debug_pubnames and .debug_pubtypes sections.
+@item -gdwarf-@var{version}
+@opindex gdwarf-@var{version}
+Produce debugging information in DWARF format (if that is supported).
+The value of @var{version} may be either 2, 3, 4 or 5; the default version
+for most targets is 4.  DWARF Version 5 is only experimental.
 
-@item -ggnu-pubnames
-@opindex ggnu-pubnames
-Generate .debug_pubnames and .debug_pubtypes sections in a format
-suitable for conversion into a GDB@ index.  This option is only useful
-with a linker that can produce GDB@ index version 7.
+Note that with DWARF Version 2, some ports require and always
+use some non-conflicting DWARF 3 extensions in the unwind tables.
+
+Version 4 may require GDB 7.0 and @option{-fvar-tracking-assignments}
+for maximum benefit.
 
 @item -gstabs
 @opindex gstabs
@@ -5763,31 +5761,6 @@ systems.  On MIPS, Alpha and System V Release 4 systems this option
 produces stabs debugging output that is not understood by DBX or SDB@.
 On System V Release 4 systems this option requires the GNU assembler.
 
-@item -feliminate-unused-debug-symbols
-@opindex feliminate-unused-debug-symbols
-Produce debugging information in stabs format (if that is supported),
-for only symbols that are actually used.
-
-@item -femit-class-debug-always
-@opindex femit-class-debug-always
-Instead of emitting debugging information for a C++ class in only one
-object file, emit it in all object files using the class.  This option
-should be used only with debuggers that are unable to handle the way GCC
-normally emits debugging information for classes because using this
-option increases the size of debugging information by as much as a
-factor of two.
-
-@item -fdebug-types-section
-@opindex fdebug-types-section
-@opindex fno-debug-types-section
-When using DWARF Version 4 or higher, type DIEs can be put into
-their own @code{.debug_types} section instead of making them part of the
-@code{.debug_info} section.  It is more efficient to put them in a separate
-comdat sections since the linker can then remove duplicates.
-But not all DWARF consumers support @code{.debug_types} sections yet
-and on some objects @code{.debug_types} produces larger instead of smaller
-debugging information.
-
 @item -gstabs+
 @opindex gstabs+
 Produce debugging information in stabs format (if that is supported),
@@ -5814,55 +5787,6 @@ use of these extensions is likely to make other debuggers crash or
 refuse to read the program, and may cause assemblers other than the GNU
 assembler (GAS) to fail with an error.
 
-@item -gdwarf-@var{version}
-@opindex gdwarf-@var{version}
-Produce debugging information in DWARF format (if that is supported).
-The value of @var{version} may be either 2, 3, 4 or 5; the default version
-for most targets is 4.  DWARF Version 5 is only experimental.
-
-Note that with DWARF Version 2, some ports require and always
-use some non-conflicting DWARF 3 extensions in the unwind tables.
-
-Version 4 may require GDB 7.0 and @option{-fvar-tracking-assignments}
-for maximum benefit.
-
-@item -grecord-gcc-switches
-@opindex grecord-gcc-switches
-This switch causes the command-line options used to invoke the
-compiler that may affect code generation to be appended to the
-DW_AT_producer attribute in DWARF debugging information.  The options
-are concatenated with spaces separating them from each other and from
-the compiler version.  See also @option{-frecord-gcc-switches} for another
-way of storing compiler options into the object file.  This is the default.
-
-@item -gno-record-gcc-switches
-@opindex gno-record-gcc-switches
-Disallow appending command-line options to the DW_AT_producer attribute
-in DWARF debugging information.
-
-@item -gstrict-dwarf
-@opindex gstrict-dwarf
-Disallow using extensions of later DWARF standard version than selected
-with @option{-gdwarf-@var{version}}.  On most targets using non-conflicting
-DWARF extensions from later standard versions is allowed.
-
-@item -gno-strict-dwarf
-@opindex gno-strict-dwarf
-Allow using extensions of later DWARF standard version than selected with
-@option{-gdwarf-@var{version}}.
-
-@item -gz@r{[}=@var{type}@r{]}
-@opindex gz
-Produce compressed debug sections in DWARF format, if that is supported.
-If @var{type} is not given, the default type depends on the capabilities
-of the assembler and linker used.  @var{type} may be one of
-@samp{none} (don't compress debug sections), @samp{zlib} (use zlib
-compression in ELF gABI format), or @samp{zlib-gnu} (use zlib
-compression in traditional GNU format).  If the linker doesn't support
-writing compressed debug sections, the option is rejected.  Otherwise,
-if the assembler does not support them, @option{-gz} is silently ignored
-when producing object files.
-
 @item -gvms
 @opindex gvms
 Produce debugging information in Alpha/VMS debug format (if that is
@@ -5897,69 +5821,122 @@ debug format is long obsolete, but the option cannot be changed now.
 Instead use an additional @option{-g@var{level}} option to change the
 debug level for DWARF.
 
-@item -gtoggle
-@opindex gtoggle
-Turn off generation of debug info, if leaving out this option
-generates it, or turn it on at level 2 otherwise.  The position of this
-argument in the command line does not matter; it takes effect after all
-other options are processed, and it does so only once, no matter how
-many times it is given.  This is mainly intended to be used with
-@option{-fcompare-debug}.
+@item -feliminate-unused-debug-symbols
+@opindex feliminate-unused-debug-symbols
+Produce debugging information in stabs format (if that is supported),
+for only symbols that are actually used.
 
-@item -fchecking
-@opindex fchecking
-@opindex fno-checking
-Enable internal consistency checking.  The default depends on
-the compiler configuration.
+@item -femit-class-debug-always
+@opindex femit-class-debug-always
+Instead of emitting debugging information for a C++ class in only one
+object file, emit it in all object files using the class.  This option
+should be used only with debuggers that are unable to handle the way GCC
+normally emits debugging information for classes because using this
+option increases the size of debugging information by as much as a
+factor of two.
 
-@item -fdump-final-insns@r{[}=@var{file}@r{]}
-@opindex fdump-final-insns
-Dump the final internal representation (RTL) to @var{file}.  If the
-optional argument is omitted (or if @var{file} is @code{.}), the name
-of the dump file is determined by appending @code{.gkd} to the
-compilation output file name.
+@item -fno-merge-debug-strings
+@opindex fmerge-debug-strings
+@opindex fno-merge-debug-strings
+Direct the linker to not merge together strings in the debugging
+information that are identical in different object files.  Merging is
+not supported by all assemblers or linkers.  Merging decreases the size
+of the debug information in the output file at the cost of increasing
+link processing time.  Merging is enabled by default.
 
-@item -fcompare-debug@r{[}=@var{opts}@r{]}
-@opindex fcompare-debug
-@opindex fno-compare-debug
-If no error occurs during compilation, run the compiler a second time,
-adding @var{opts} and @option{-fcompare-debug-second} to the arguments
-passed to the second compilation.  Dump the final internal
-representation in both compilations, and print an error if they differ.
+@item -fdebug-prefix-map=@var{old}=@var{new}
+@opindex fdebug-prefix-map
+When compiling files in directory @file{@var{old}}, record debugging
+information describing them as in @file{@var{new}} instead.
 
-If the equal sign is omitted, the default @option{-gtoggle} is used.
+@item -fvar-tracking
+@opindex fvar-tracking
+Run variable tracking pass.  It computes where variables are stored at each
+position in code.  Better debugging information is then generated
+(if the debugging information format supports this information).
 
-The environment variable @env{GCC_COMPARE_DEBUG}, if defined, non-empty
-and nonzero, implicitly enables @option{-fcompare-debug}.  If
-@env{GCC_COMPARE_DEBUG} is defined to a string starting with a dash,
-then it is used for @var{opts}, otherwise the default @option{-gtoggle}
-is used.
+It is enabled by default when compiling with optimization (@option{-Os},
+@option{-O}, @option{-O2}, @dots{}), debugging information (@option{-g}) and
+the debug info format supports it.
 
-@option{-fcompare-debug=}, with the equal sign but without @var{opts},
-is equivalent to @option{-fno-compare-debug}, which disables the dumping
-of the final representation and the second compilation, preventing even
-@env{GCC_COMPARE_DEBUG} from taking effect.
+@item -fvar-tracking-assignments
+@opindex fvar-tracking-assignments
+@opindex fno-var-tracking-assignments
+Annotate assignments to user variables early in the compilation and
+attempt to carry the annotations over throughout the compilation all the
+way to the end, in an attempt to improve debug information while
+optimizing.  Use of @option{-gdwarf-4} is recommended along with it.
 
-To verify full coverage during @option{-fcompare-debug} testing, set
-@env{GCC_COMPARE_DEBUG} to say @option{-fcompare-debug-not-overridden},
-which GCC rejects as an invalid option in any actual compilation
-(rather than preprocessing, assembly or linking).  To get just a
-warning, setting @env{GCC_COMPARE_DEBUG} to @samp{-w%n-fcompare-debug
-not overridden} will do.
+It can be enabled even if var-tracking is disabled, in which case
+annotations are created and maintained, but discarded at the end.
+By default, this flag is enabled together with @option{-fvar-tracking},
+except when selective scheduling is enabled.
 
-@item -fcompare-debug-second
-@opindex fcompare-debug-second
-This option is implicitly passed to the compiler for the second
-compilation requested by @option{-fcompare-debug}, along with options to
-silence warnings, and omitting other options that would cause
-side-effect compiler outputs to files or to the standard output.  Dump
-files and preserved temporary files are renamed so as to contain the
-@code{.gk} additional extension during the second compilation, to avoid
-overwriting those generated by the first.
+@item -gsplit-dwarf
+@opindex gsplit-dwarf
+Separate as much dwarf debugging information as possible into a
+separate output file with the extension .dwo.  This option allows
+the build system to avoid linking files with debug information.  To
+be useful, this option requires a debugger capable of reading .dwo
+files.
 
-When this option is passed to the compiler driver, it causes the
-@emph{first} compilation to be skipped, which makes it useful for little
-other than debugging the compiler proper.
+@item -gpubnames
+@opindex gpubnames
+Generate dwarf .debug_pubnames and .debug_pubtypes sections.
+
+@item -ggnu-pubnames
+@opindex ggnu-pubnames
+Generate .debug_pubnames and .debug_pubtypes sections in a format
+suitable for conversion into a GDB@ index.  This option is only useful
+with a linker that can produce GDB@ index version 7.
+
+@item -fdebug-types-section
+@opindex fdebug-types-section
+@opindex fno-debug-types-section
+When using DWARF Version 4 or higher, type DIEs can be put into
+their own @code{.debug_types} section instead of making them part of the
+@code{.debug_info} section.  It is more efficient to put them in a separate
+comdat sections since the linker can then remove duplicates.
+But not all DWARF consumers support @code{.debug_types} sections yet
+and on some objects @code{.debug_types} produces larger instead of smaller
+debugging information.
+
+@item -grecord-gcc-switches
+@opindex grecord-gcc-switches
+This switch causes the command-line options used to invoke the
+compiler that may affect code generation to be appended to the
+DW_AT_producer attribute in DWARF debugging information.  The options
+are concatenated with spaces separating them from each other and from
+the compiler version.  See also @option{-frecord-gcc-switches} for another
+way of storing compiler options into the object file.  This is the default.
+
+@item -gno-record-gcc-switches
+@opindex gno-record-gcc-switches
+Disallow appending command-line options to the DW_AT_producer attribute
+in DWARF debugging information.
+
+@item -gstrict-dwarf
+@opindex gstrict-dwarf
+Disallow using extensions of later DWARF standard version than selected
+with @option{-gdwarf-@var{version}}.  On most targets using non-conflicting
+DWARF extensions from later standard versions is allowed.
+
+@item -gno-strict-dwarf
+@opindex gno-strict-dwarf
+Allow using extensions of later DWARF standard version than selected with
+@option{-gdwarf-@var{version}}.
+
+@item -gz@r{[}=@var{type}@r{]}
+@opindex gz
+Produce compressed debug sections in DWARF format, if that is supported.
+If @var{type} is not given, the default type depends on the capabilities
+of the assembler and linker used.  @var{type} may be one of
+@samp{none} (don't compress debug sections), @samp{zlib} (use zlib
+compression in ELF gABI format), or @samp{zlib-gnu} (use zlib
+compression in traditional GNU format).  If the linker doesn't support
+writing compressed debug sections, the option is rejected.  Otherwise,
+if the assembler does not support them, @option{-gz} is silently ignored
+when producing object files.
 
 @item -feliminate-dwarf2-dups
 @opindex feliminate-dwarf2-dups
@@ -6042,1164 +6019,12 @@ The default is @option{-femit-struct-debug-detailed=all}.
 
 This option works only with DWARF 2.
 
-@item -fno-merge-debug-strings
-@opindex fmerge-debug-strings
-@opindex fno-merge-debug-strings
-Direct the linker to not merge together strings in the debugging
-information that are identical in different object files.  Merging is
-not supported by all assemblers or linkers.  Merging decreases the size
-of the debug information in the output file at the cost of increasing
-link processing time.  Merging is enabled by default.
-
-@item -fdebug-prefix-map=@var{old}=@var{new}
-@opindex fdebug-prefix-map
-When compiling files in directory @file{@var{old}}, record debugging
-information describing them as in @file{@var{new}} instead.
-
 @item -fno-dwarf2-cfi-asm
 @opindex fdwarf2-cfi-asm
 @opindex fno-dwarf2-cfi-asm
 Emit DWARF 2 unwind info as compiler generated @code{.eh_frame} section
 instead of using GAS @code{.cfi_*} directives.
 
-@item -Q
-@opindex Q
-Makes the compiler print out each function name as it is compiled, and
-print some statistics about each pass when it finishes.
-
-@item -ftime-report
-@opindex ftime-report
-Makes the compiler print some statistics about the time consumed by each
-pass when it finishes.
-
-@item -fmem-report
-@opindex fmem-report
-Makes the compiler print some statistics about permanent memory
-allocation when it finishes.
-
-@item -fmem-report-wpa
-@opindex fmem-report-wpa
-Makes the compiler print some statistics about permanent memory
-allocation for the WPA phase only.
-
-@item -fpre-ipa-mem-report
-@opindex fpre-ipa-mem-report
-@item -fpost-ipa-mem-report
-@opindex fpost-ipa-mem-report
-Makes the compiler print some statistics about permanent memory
-allocation before or after interprocedural optimization.
-
-@item -fprofile-report
-@opindex fprofile-report
-Makes the compiler print some statistics about consistency of the
-(estimated) profile and effect of individual passes.
-
-@item -fstack-usage
-@opindex fstack-usage
-Makes the compiler output stack usage information for the program, on a
-per-function basis.  The filename for the dump is made by appending
-@file{.su} to the @var{auxname}.  @var{auxname} is generated from the name of
-the output file, if explicitly specified and it is not an executable,
-otherwise it is the basename of the source file.  An entry is made up
-of three fields:
-
-@itemize
-@item
-The name of the function.
-@item
-A number of bytes.
-@item
-One or more qualifiers: @code{static}, @code{dynamic}, @code{bounded}.
-@end itemize
-
-The qualifier @code{static} means that the function manipulates the stack
-statically: a fixed number of bytes are allocated for the frame on function
-entry and released on function exit; no stack adjustments are otherwise made
-in the function.  The second field is this fixed number of bytes.
-
-The qualifier @code{dynamic} means that the function manipulates the stack
-dynamically: in addition to the static allocation described above, stack
-adjustments are made in the body of the function, for example to push/pop
-arguments around function calls.  If the qualifier @code{bounded} is also
-present, the amount of these adjustments is bounded at compile time and
-the second field is an upper bound of the total amount of stack used by
-the function.  If it is not present, the amount of these adjustments is
-not bounded at compile time and the second field only represents the
-bounded part.
-
-@item -fdbg-cnt-list
-@opindex fdbg-cnt-list
-Print the name and the counter upper bound for all debug counters.
-
-
-@item -fdbg-cnt=@var{counter-value-list}
-@opindex fdbg-cnt
-Set the internal debug counter upper bound.  @var{counter-value-list}
-is a comma-separated list of @var{name}:@var{value} pairs
-which sets the upper bound of each debug counter @var{name} to @var{value}.
-All debug counters have the initial upper bound of @code{UINT_MAX};
-thus @code{dbg_cnt} returns true always unless the upper bound
-is set by this option.
-For example, with @option{-fdbg-cnt=dce:10,tail_call:0},
-@code{dbg_cnt(dce)} returns true only for first 10 invocations.
-
-@item -fenable-@var{kind}-@var{pass}
-@itemx -fdisable-@var{kind}-@var{pass}=@var{range-list}
-@opindex fdisable-
-@opindex fenable-
-
-This is a set of options that are used to explicitly disable/enable
-optimization passes.  These options are intended for use for debugging GCC.
-Compiler users should use regular options for enabling/disabling
-passes instead.
-
-@table @gcctabopt
-
-@item -fdisable-ipa-@var{pass}
-Disable IPA pass @var{pass}. @var{pass} is the pass name.  If the same pass is
-statically invoked in the compiler multiple times, the pass name should be
-appended with a sequential number starting from 1.
-
-@item -fdisable-rtl-@var{pass}
-@itemx -fdisable-rtl-@var{pass}=@var{range-list}
-Disable RTL pass @var{pass}.  @var{pass} is the pass name.  If the same pass is
-statically invoked in the compiler multiple times, the pass name should be
-appended with a sequential number starting from 1.  @var{range-list} is a 
-comma-separated list of function ranges or assembler names.  Each range is a number
-pair separated by a colon.  The range is inclusive in both ends.  If the range
-is trivial, the number pair can be simplified as a single number.  If the
-function's call graph node's @var{uid} falls within one of the specified ranges,
-the @var{pass} is disabled for that function.  The @var{uid} is shown in the
-function header of a dump file, and the pass names can be dumped by using
-option @option{-fdump-passes}.
-
-@item -fdisable-tree-@var{pass}
-@itemx -fdisable-tree-@var{pass}=@var{range-list}
-Disable tree pass @var{pass}.  See @option{-fdisable-rtl} for the description of
-option arguments.
-
-@item -fenable-ipa-@var{pass}
-Enable IPA pass @var{pass}.  @var{pass} is the pass name.  If the same pass is
-statically invoked in the compiler multiple times, the pass name should be
-appended with a sequential number starting from 1.
-
-@item -fenable-rtl-@var{pass}
-@itemx -fenable-rtl-@var{pass}=@var{range-list}
-Enable RTL pass @var{pass}.  See @option{-fdisable-rtl} for option argument
-description and examples.
-
-@item -fenable-tree-@var{pass}
-@itemx -fenable-tree-@var{pass}=@var{range-list}
-Enable tree pass @var{pass}.  See @option{-fdisable-rtl} for the description
-of option arguments.
-
-@end table
-
-Here are some examples showing uses of these options.
-
-@smallexample
-
-# disable ccp1 for all functions
-   -fdisable-tree-ccp1
-# disable complete unroll for function whose cgraph node uid is 1
-   -fenable-tree-cunroll=1
-# disable gcse2 for functions at the following ranges [1,1],
-# [300,400], and [400,1000]
-# disable gcse2 for functions foo and foo2
-   -fdisable-rtl-gcse2=foo,foo2
-# disable early inlining
-   -fdisable-tree-einline
-# disable ipa inlining
-   -fdisable-ipa-inline
-# enable tree full unroll
-   -fenable-tree-unroll
-
-@end smallexample
-
-@item -d@var{letters}
-@itemx -fdump-rtl-@var{pass}
-@itemx -fdump-rtl-@var{pass}=@var{filename}
-@opindex d
-@opindex fdump-rtl-@var{pass}
-Says to make debugging dumps during compilation at times specified by
-@var{letters}.  This is used for debugging the RTL-based passes of the
-compiler.  The file names for most of the dumps are made by appending
-a pass number and a word to the @var{dumpname}, and the files are
-created in the directory of the output file.  In case of
-@option{=@var{filename}} option, the dump is output on the given file
-instead of the pass numbered dump files.  Note that the pass number is
-assigned as passes are registered into the pass manager.  Most passes
-are registered in the order that they will execute and for these passes
-the number corresponds to the pass execution order.  However, passes
-registered by plugins, passes specific to compilation targets, or
-passes that are otherwise registered after all the other passes are
-numbered higher than a pass named "final", even if they are executed
-earlier.  @var{dumpname} is generated from the name of the output
-file if explicitly specified and not an executable, otherwise it is
-the basename of the source file.  These switches may have different
-effects when @option{-E} is used for preprocessing.
-
-Debug dumps can be enabled with a @option{-fdump-rtl} switch or some
-@option{-d} option @var{letters}.  Here are the possible
-letters for use in @var{pass} and @var{letters}, and their meanings:
-
-@table @gcctabopt
-
-@item -fdump-rtl-alignments
-@opindex fdump-rtl-alignments
-Dump after branch alignments have been computed.
-
-@item -fdump-rtl-asmcons
-@opindex fdump-rtl-asmcons
-Dump after fixing rtl statements that have unsatisfied in/out constraints.
-
-@item -fdump-rtl-auto_inc_dec
-@opindex fdump-rtl-auto_inc_dec
-Dump after auto-inc-dec discovery.  This pass is only run on
-architectures that have auto inc or auto dec instructions.
-
-@item -fdump-rtl-barriers
-@opindex fdump-rtl-barriers
-Dump after cleaning up the barrier instructions.
-
-@item -fdump-rtl-bbpart
-@opindex fdump-rtl-bbpart
-Dump after partitioning hot and cold basic blocks.
-
-@item -fdump-rtl-bbro
-@opindex fdump-rtl-bbro
-Dump after block reordering.
-
-@item -fdump-rtl-btl1
-@itemx -fdump-rtl-btl2
-@opindex fdump-rtl-btl2
-@opindex fdump-rtl-btl2
-@option{-fdump-rtl-btl1} and @option{-fdump-rtl-btl2} enable dumping
-after the two branch
-target load optimization passes.
-
-@item -fdump-rtl-bypass
-@opindex fdump-rtl-bypass
-Dump after jump bypassing and control flow optimizations.
-
-@item -fdump-rtl-combine
-@opindex fdump-rtl-combine
-Dump after the RTL instruction combination pass.
-
-@item -fdump-rtl-compgotos
-@opindex fdump-rtl-compgotos
-Dump after duplicating the computed gotos.
-
-@item -fdump-rtl-ce1
-@itemx -fdump-rtl-ce2
-@itemx -fdump-rtl-ce3
-@opindex fdump-rtl-ce1
-@opindex fdump-rtl-ce2
-@opindex fdump-rtl-ce3
-@option{-fdump-rtl-ce1}, @option{-fdump-rtl-ce2}, and
-@option{-fdump-rtl-ce3} enable dumping after the three
-if conversion passes.
-
-@item -fdump-rtl-cprop_hardreg
-@opindex fdump-rtl-cprop_hardreg
-Dump after hard register copy propagation.
-
-@item -fdump-rtl-csa
-@opindex fdump-rtl-csa
-Dump after combining stack adjustments.
-
-@item -fdump-rtl-cse1
-@itemx -fdump-rtl-cse2
-@opindex fdump-rtl-cse1
-@opindex fdump-rtl-cse2
-@option{-fdump-rtl-cse1} and @option{-fdump-rtl-cse2} enable dumping after
-the two common subexpression elimination passes.
-
-@item -fdump-rtl-dce
-@opindex fdump-rtl-dce
-Dump after the standalone dead code elimination passes.
-
-@item -fdump-rtl-dbr
-@opindex fdump-rtl-dbr
-Dump after delayed branch scheduling.
-
-@item -fdump-rtl-dce1
-@itemx -fdump-rtl-dce2
-@opindex fdump-rtl-dce1
-@opindex fdump-rtl-dce2
-@option{-fdump-rtl-dce1} and @option{-fdump-rtl-dce2} enable dumping after
-the two dead store elimination passes.
-
-@item -fdump-rtl-eh
-@opindex fdump-rtl-eh
-Dump after finalization of EH handling code.
-
-@item -fdump-rtl-eh_ranges
-@opindex fdump-rtl-eh_ranges
-Dump after conversion of EH handling range regions.
-
-@item -fdump-rtl-expand
-@opindex fdump-rtl-expand
-Dump after RTL generation.
-
-@item -fdump-rtl-fwprop1
-@itemx -fdump-rtl-fwprop2
-@opindex fdump-rtl-fwprop1
-@opindex fdump-rtl-fwprop2
-@option{-fdump-rtl-fwprop1} and @option{-fdump-rtl-fwprop2} enable
-dumping after the two forward propagation passes.
-
-@item -fdump-rtl-gcse1
-@itemx -fdump-rtl-gcse2
-@opindex fdump-rtl-gcse1
-@opindex fdump-rtl-gcse2
-@option{-fdump-rtl-gcse1} and @option{-fdump-rtl-gcse2} enable dumping
-after global common subexpression elimination.
-
-@item -fdump-rtl-init-regs
-@opindex fdump-rtl-init-regs
-Dump after the initialization of the registers.
-
-@item -fdump-rtl-initvals
-@opindex fdump-rtl-initvals
-Dump after the computation of the initial value sets.
-
-@item -fdump-rtl-into_cfglayout
-@opindex fdump-rtl-into_cfglayout
-Dump after converting to cfglayout mode.
-
-@item -fdump-rtl-ira
-@opindex fdump-rtl-ira
-Dump after iterated register allocation.
-
-@item -fdump-rtl-jump
-@opindex fdump-rtl-jump
-Dump after the second jump optimization.
-
-@item -fdump-rtl-loop2
-@opindex fdump-rtl-loop2
-@option{-fdump-rtl-loop2} enables dumping after the rtl
-loop optimization passes.
-
-@item -fdump-rtl-mach
-@opindex fdump-rtl-mach
-Dump after performing the machine dependent reorganization pass, if that
-pass exists.
-
-@item -fdump-rtl-mode_sw
-@opindex fdump-rtl-mode_sw
-Dump after removing redundant mode switches.
-
-@item -fdump-rtl-rnreg
-@opindex fdump-rtl-rnreg
-Dump after register renumbering.
-
-@item -fdump-rtl-outof_cfglayout
-@opindex fdump-rtl-outof_cfglayout
-Dump after converting from cfglayout mode.
-
-@item -fdump-rtl-peephole2
-@opindex fdump-rtl-peephole2
-Dump after the peephole pass.
-
-@item -fdump-rtl-postreload
-@opindex fdump-rtl-postreload
-Dump after post-reload optimizations.
-
-@item -fdump-rtl-pro_and_epilogue
-@opindex fdump-rtl-pro_and_epilogue
-Dump after generating the function prologues and epilogues.
-
-@item -fdump-rtl-sched1
-@itemx -fdump-rtl-sched2
-@opindex fdump-rtl-sched1
-@opindex fdump-rtl-sched2
-@option{-fdump-rtl-sched1} and @option{-fdump-rtl-sched2} enable dumping
-after the basic block scheduling passes.
-
-@item -fdump-rtl-ree
-@opindex fdump-rtl-ree
-Dump after sign/zero extension elimination.
-
-@item -fdump-rtl-seqabstr
-@opindex fdump-rtl-seqabstr
-Dump after common sequence discovery.
-
-@item -fdump-rtl-shorten
-@opindex fdump-rtl-shorten
-Dump after shortening branches.
-
-@item -fdump-rtl-sibling
-@opindex fdump-rtl-sibling
-Dump after sibling call optimizations.
-
-@item -fdump-rtl-split1
-@itemx -fdump-rtl-split2
-@itemx -fdump-rtl-split3
-@itemx -fdump-rtl-split4
-@itemx -fdump-rtl-split5
-@opindex fdump-rtl-split1
-@opindex fdump-rtl-split2
-@opindex fdump-rtl-split3
-@opindex fdump-rtl-split4
-@opindex fdump-rtl-split5
-These options enable dumping after five rounds of
-instruction splitting.
-
-@item -fdump-rtl-sms
-@opindex fdump-rtl-sms
-Dump after modulo scheduling.  This pass is only run on some
-architectures.
-
-@item -fdump-rtl-stack
-@opindex fdump-rtl-stack
-Dump after conversion from GCC's ``flat register file'' registers to the
-x87's stack-like registers.  This pass is only run on x86 variants.
-
-@item -fdump-rtl-subreg1
-@itemx -fdump-rtl-subreg2
-@opindex fdump-rtl-subreg1
-@opindex fdump-rtl-subreg2
-@option{-fdump-rtl-subreg1} and @option{-fdump-rtl-subreg2} enable dumping after
-the two subreg expansion passes.
-
-@item -fdump-rtl-unshare
-@opindex fdump-rtl-unshare
-Dump after all rtl has been unshared.
-
-@item -fdump-rtl-vartrack
-@opindex fdump-rtl-vartrack
-Dump after variable tracking.
-
-@item -fdump-rtl-vregs
-@opindex fdump-rtl-vregs
-Dump after converting virtual registers to hard registers.
-
-@item -fdump-rtl-web
-@opindex fdump-rtl-web
-Dump after live range splitting.
-
-@item -fdump-rtl-regclass
-@itemx -fdump-rtl-subregs_of_mode_init
-@itemx -fdump-rtl-subregs_of_mode_finish
-@itemx -fdump-rtl-dfinit
-@itemx -fdump-rtl-dfinish
-@opindex fdump-rtl-regclass
-@opindex fdump-rtl-subregs_of_mode_init
-@opindex fdump-rtl-subregs_of_mode_finish
-@opindex fdump-rtl-dfinit
-@opindex fdump-rtl-dfinish
-These dumps are defined but always produce empty files.
-
-@item -da
-@itemx -fdump-rtl-all
-@opindex da
-@opindex fdump-rtl-all
-Produce all the dumps listed above.
-
-@item -dA
-@opindex dA
-Annotate the assembler output with miscellaneous debugging information.
-
-@item -dD
-@opindex dD
-Dump all macro definitions, at the end of preprocessing, in addition to
-normal output.
-
-@item -dH
-@opindex dH
-Produce a core dump whenever an error occurs.
-
-@item -dp
-@opindex dp
-Annotate the assembler output with a comment indicating which
-pattern and alternative is used.  The length of each instruction is
-also printed.
-
-@item -dP
-@opindex dP
-Dump the RTL in the assembler output as a comment before each instruction.
-Also turns on @option{-dp} annotation.
-
-@item -dx
-@opindex dx
-Just generate RTL for a function instead of compiling it.  Usually used
-with @option{-fdump-rtl-expand}.
-@end table
-
-@item -fdump-noaddr
-@opindex fdump-noaddr
-When doing debugging dumps, suppress address output.  This makes it more
-feasible to use diff on debugging dumps for compiler invocations with
-different compiler binaries and/or different
-text / bss / data / heap / stack / dso start locations.
-
-@item -freport-bug
-@opindex freport-bug
-Collect and dump debug information into temporary file if ICE in C/C++
-compiler occured.
-
-@item -fdump-unnumbered
-@opindex fdump-unnumbered
-When doing debugging dumps, suppress instruction numbers and address output.
-This makes it more feasible to use diff on debugging dumps for compiler
-invocations with different options, in particular with and without
-@option{-g}.
-
-@item -fdump-unnumbered-links
-@opindex fdump-unnumbered-links
-When doing debugging dumps (see @option{-d} option above), suppress
-instruction numbers for the links to the previous and next instructions
-in a sequence.
-
-@item -fdump-translation-unit @r{(C++ only)}
-@itemx -fdump-translation-unit-@var{options} @r{(C++ only)}
-@opindex fdump-translation-unit
-Dump a representation of the tree structure for the entire translation
-unit to a file.  The file name is made by appending @file{.tu} to the
-source file name, and the file is created in the same directory as the
-output file.  If the @samp{-@var{options}} form is used, @var{options}
-controls the details of the dump as described for the
-@option{-fdump-tree} options.
-
-@item -fdump-class-hierarchy @r{(C++ only)}
-@itemx -fdump-class-hierarchy-@var{options} @r{(C++ only)}
-@opindex fdump-class-hierarchy
-Dump a representation of each class's hierarchy and virtual function
-table layout to a file.  The file name is made by appending
-@file{.class} to the source file name, and the file is created in the
-same directory as the output file.  If the @samp{-@var{options}} form
-is used, @var{options} controls the details of the dump as described
-for the @option{-fdump-tree} options.
-
-@item -fdump-ipa-@var{switch}
-@opindex fdump-ipa
-Control the dumping at various stages of inter-procedural analysis
-language tree to a file.  The file name is generated by appending a
-switch specific suffix to the source file name, and the file is created
-in the same directory as the output file.  The following dumps are
-possible:
-
-@table @samp
-@item all
-Enables all inter-procedural analysis dumps.
-
-@item cgraph
-Dumps information about call-graph optimization, unused function removal,
-and inlining decisions.
-
-@item inline
-Dump after function inlining.
-
-@end table
-
-@item -fdump-passes
-@opindex fdump-passes
-Dump the list of optimization passes that are turned on and off by
-the current command-line options.
-
-@item -fdump-statistics-@var{option}
-@opindex fdump-statistics
-Enable and control dumping of pass statistics in a separate file.  The
-file name is generated by appending a suffix ending in
-@samp{.statistics} to the source file name, and the file is created in
-the same directory as the output file.  If the @samp{-@var{option}}
-form is used, @samp{-stats} causes counters to be summed over the
-whole compilation unit while @samp{-details} dumps every event as
-the passes generate them.  The default with no option is to sum
-counters for each function compiled.
-
-@item -fdump-tree-@var{switch}
-@itemx -fdump-tree-@var{switch}-@var{options}
-@itemx -fdump-tree-@var{switch}-@var{options}=@var{filename}
-@opindex fdump-tree
-Control the dumping at various stages of processing the intermediate
-language tree to a file.  The file name is generated by appending a
-switch-specific suffix to the source file name, and the file is
-created in the same directory as the output file. In case of
-@option{=@var{filename}} option, the dump is output on the given file
-instead of the auto named dump files.  If the @samp{-@var{options}}
-form is used, @var{options} is a list of @samp{-} separated options
-which control the details of the dump.  Not all options are applicable
-to all dumps; those that are not meaningful are ignored.  The
-following options are available
-
-@table @samp
-@item address
-Print the address of each node.  Usually this is not meaningful as it
-changes according to the environment and source file.  Its primary use
-is for tying up a dump file with a debug environment.
-@item asmname
-If @code{DECL_ASSEMBLER_NAME} has been set for a given decl, use that
-in the dump instead of @code{DECL_NAME}.  Its primary use is ease of
-use working backward from mangled names in the assembly file.
-@item slim
-When dumping front-end intermediate representations, inhibit dumping
-of members of a scope or body of a function merely because that scope
-has been reached.  Only dump such items when they are directly reachable
-by some other path.
-
-When dumping pretty-printed trees, this option inhibits dumping the
-bodies of control structures.
-
-When dumping RTL, print the RTL in slim (condensed) form instead of
-the default LISP-like representation.
-@item raw
-Print a raw representation of the tree.  By default, trees are
-pretty-printed into a C-like representation.
-@item details
-Enable more detailed dumps (not honored by every dump option). Also
-include information from the optimization passes.
-@item stats
-Enable dumping various statistics about the pass (not honored by every dump
-option).
-@item blocks
-Enable showing basic block boundaries (disabled in raw dumps).
-@item graph
-For each of the other indicated dump files (@option{-fdump-rtl-@var{pass}}),
-dump a representation of the control flow graph suitable for viewing with
-GraphViz to @file{@var{file}.@var{passid}.@var{pass}.dot}.  Each function in
-the file is pretty-printed as a subgraph, so that GraphViz can render them
-all in a single plot.
-
-This option currently only works for RTL dumps, and the RTL is always
-dumped in slim form.
-@item vops
-Enable showing virtual operands for every statement.
-@item lineno
-Enable showing line numbers for statements.
-@item uid
-Enable showing the unique ID (@code{DECL_UID}) for each variable.
-@item verbose
-Enable showing the tree dump for each statement.
-@item eh
-Enable showing the EH region number holding each statement.
-@item scev
-Enable showing scalar evolution analysis details.
-@item optimized
-Enable showing optimization information (only available in certain
-passes).
-@item missed
-Enable showing missed optimization information (only available in certain
-passes).
-@item note
-Enable other detailed optimization information (only available in
-certain passes).
-@item =@var{filename}
-Instead of an auto named dump file, output into the given file
-name. The file names @file{stdout} and @file{stderr} are treated
-specially and are considered already open standard streams. For
-example,
-
-@smallexample
-gcc -O2 -ftree-vectorize -fdump-tree-vect-blocks=foo.dump
-     -fdump-tree-pre=stderr file.c
-@end smallexample
-
-outputs vectorizer dump into @file{foo.dump}, while the PRE dump is
-output on to @file{stderr}. If two conflicting dump filenames are
-given for the same pass, then the latter option overrides the earlier
-one.
-
-@item split-paths
-@opindex fdump-tree-split-paths
-Dump each function after splitting paths to loop backedges.  The file
-name is made by appending @file{.split-paths} to the source file name.
-
-@item all
-Turn on all options, except @option{raw}, @option{slim}, @option{verbose}
-and @option{lineno}.
-
-@item optall
-Turn on all optimization options, i.e., @option{optimized},
-@option{missed}, and @option{note}.
-@end table
-
-The following tree dumps are possible:
-@table @samp
-
-@item original
-@opindex fdump-tree-original
-Dump before any tree based optimization, to @file{@var{file}.original}.
-
-@item optimized
-@opindex fdump-tree-optimized
-Dump after all tree based optimization, to @file{@var{file}.optimized}.
-
-@item gimple
-@opindex fdump-tree-gimple
-Dump each function before and after the gimplification pass to a file.  The
-file name is made by appending @file{.gimple} to the source file name.
-
-@item cfg
-@opindex fdump-tree-cfg
-Dump the control flow graph of each function to a file.  The file name is
-made by appending @file{.cfg} to the source file name.
-
-@item ch
-@opindex fdump-tree-ch
-Dump each function after copying loop headers.  The file name is made by
-appending @file{.ch} to the source file name.
-
-@item ssa
-@opindex fdump-tree-ssa
-Dump SSA related information to a file.  The file name is made by appending
-@file{.ssa} to the source file name.
-
-@item alias
-@opindex fdump-tree-alias
-Dump aliasing information for each function.  The file name is made by
-appending @file{.alias} to the source file name.
-
-@item ccp
-@opindex fdump-tree-ccp
-Dump each function after CCP@.  The file name is made by appending
-@file{.ccp} to the source file name.
-
-@item storeccp
-@opindex fdump-tree-storeccp
-Dump each function after STORE-CCP@.  The file name is made by appending
-@file{.storeccp} to the source file name.
-
-@item pre
-@opindex fdump-tree-pre
-Dump trees after partial redundancy elimination.  The file name is made
-by appending @file{.pre} to the source file name.
-
-@item fre
-@opindex fdump-tree-fre
-Dump trees after full redundancy elimination.  The file name is made
-by appending @file{.fre} to the source file name.
-
-@item copyprop
-@opindex fdump-tree-copyprop
-Dump trees after copy propagation.  The file name is made
-by appending @file{.copyprop} to the source file name.
-
-@item store_copyprop
-@opindex fdump-tree-store_copyprop
-Dump trees after store copy-propagation.  The file name is made
-by appending @file{.store_copyprop} to the source file name.
-
-@item dce
-@opindex fdump-tree-dce
-Dump each function after dead code elimination.  The file name is made by
-appending @file{.dce} to the source file name.
-
-@item sra
-@opindex fdump-tree-sra
-Dump each function after performing scalar replacement of aggregates.  The
-file name is made by appending @file{.sra} to the source file name.
-
-@item sink
-@opindex fdump-tree-sink
-Dump each function after performing code sinking.  The file name is made
-by appending @file{.sink} to the source file name.
-
-@item dom
-@opindex fdump-tree-dom
-Dump each function after applying dominator tree optimizations.  The file
-name is made by appending @file{.dom} to the source file name.
-
-@item dse
-@opindex fdump-tree-dse
-Dump each function after applying dead store elimination.  The file
-name is made by appending @file{.dse} to the source file name.
-
-@item phiopt
-@opindex fdump-tree-phiopt
-Dump each function after optimizing PHI nodes into straightline code.  The file
-name is made by appending @file{.phiopt} to the source file name.
-
-@item backprop
-@opindex fdump-tree-backprop
-Dump each function after back-propagating use information up the definition
-chain.  The file name is made by appending @file{.backprop} to the
-source file name.
-
-@item forwprop
-@opindex fdump-tree-forwprop
-Dump each function after forward propagating single use variables.  The file
-name is made by appending @file{.forwprop} to the source file name.
-
-@item nrv
-@opindex fdump-tree-nrv
-Dump each function after applying the named return value optimization on
-generic trees.  The file name is made by appending @file{.nrv} to the source
-file name.
-
-@item vect
-@opindex fdump-tree-vect
-Dump each function after applying vectorization of loops.  The file name is
-made by appending @file{.vect} to the source file name.
-
-@item slp
-@opindex fdump-tree-slp
-Dump each function after applying vectorization of basic blocks.  The file name
-is made by appending @file{.slp} to the source file name.
-
-@item vrp
-@opindex fdump-tree-vrp
-Dump each function after Value Range Propagation (VRP).  The file name
-is made by appending @file{.vrp} to the source file name.
-
-@item oaccdevlow
-@opindex fdump-tree-oaccdevlow
-Dump each function after applying device-specific OpenACC transformations.
-The file name is made by appending @file{.oaccdevlow} to the source file name.
-
-@item all
-@opindex fdump-tree-all
-Enable all the available tree dumps with the flags provided in this option.
-@end table
-
-@item -fopt-info
-@itemx -fopt-info-@var{options}
-@itemx -fopt-info-@var{options}=@var{filename}
-@opindex fopt-info
-Controls optimization dumps from various optimization passes. If the
-@samp{-@var{options}} form is used, @var{options} is a list of
-@samp{-} separated option keywords to select the dump details and
-optimizations.  
-
-The @var{options} can be divided into two groups: options describing the
-verbosity of the dump, and options describing which optimizations
-should be included. The options from both the groups can be freely
-mixed as they are non-overlapping. However, in case of any conflicts,
-the later options override the earlier options on the command
-line. 
-
-The following options control the dump verbosity:
-
-@table @samp
-@item optimized
-Print information when an optimization is successfully applied. It is
-up to a pass to decide which information is relevant. For example, the
-vectorizer passes print the source location of loops which are
-successfully vectorized.
-@item missed
-Print information about missed optimizations. Individual passes
-control which information to include in the output. 
-@item note
-Print verbose information about optimizations, such as certain
-transformations, more detailed messages about decisions etc.
-@item all
-Print detailed optimization information. This includes
-@samp{optimized}, @samp{missed}, and @samp{note}.
-@end table
-
-One or more of the following option keywords can be used to describe a
-group of optimizations:
-
-@table @samp
-@item ipa
-Enable dumps from all interprocedural optimizations.
-@item loop
-Enable dumps from all loop optimizations.
-@item inline
-Enable dumps from all inlining optimizations.
-@item vec
-Enable dumps from all vectorization optimizations.
-@item optall
-Enable dumps from all optimizations. This is a superset of
-the optimization groups listed above.
-@end table
-
-If @var{options} is
-omitted, it defaults to @samp{optimized-optall}, which means to dump all
-info about successful optimizations from all the passes.  
-
-If the @var{filename} is provided, then the dumps from all the
-applicable optimizations are concatenated into the @var{filename}.
-Otherwise the dump is output onto @file{stderr}. Though multiple
-@option{-fopt-info} options are accepted, only one of them can include
-a @var{filename}. If other filenames are provided then all but the
-first such option are ignored.
-
-Note that the output @var{filename} is overwritten
-in case of multiple translation units. If a combined output from
-multiple translation units is desired, @file{stderr} should be used
-instead.
-
-In the following example, the optimization info is output to
-@file{stderr}:
-
-@smallexample
-gcc -O3 -fopt-info
-@end smallexample
-
-This example:
-@smallexample
-gcc -O3 -fopt-info-missed=missed.all
-@end smallexample
-
-@noindent
-outputs missed optimization report from all the passes into
-@file{missed.all}, and this one:
-
-@smallexample
-gcc -O2 -ftree-vectorize -fopt-info-vec-missed
-@end smallexample
-
-@noindent
-prints information about missed optimization opportunities from
-vectorization passes on @file{stderr}.  
-Note that @option{-fopt-info-vec-missed} is equivalent to 
-@option{-fopt-info-missed-vec}.
-
-As another example,
-@smallexample
-gcc -O3 -fopt-info-inline-optimized-missed=inline.txt
-@end smallexample
-
-@noindent
-outputs information about missed optimizations as well as
-optimized locations from all the inlining passes into
-@file{inline.txt}.
-
-Finally, consider:
-
-@smallexample
-gcc -fopt-info-vec-missed=vec.miss -fopt-info-loop-optimized=loop.opt
-@end smallexample
-
-@noindent
-Here the two output filenames @file{vec.miss} and @file{loop.opt} are
-in conflict since only one output file is allowed. In this case, only
-the first option takes effect and the subsequent options are
-ignored. Thus only @file{vec.miss} is produced which contains
-dumps from the vectorizer about missed opportunities.
-
-@item -frandom-seed=@var{string}
-@opindex frandom-seed
-This option provides a seed that GCC uses in place of
-random numbers in generating certain symbol names
-that have to be different in every compiled file.  It is also used to
-place unique stamps in coverage data files and the object files that
-produce them.  You can use the @option{-frandom-seed} option to produce
-reproducibly identical object files.
-
-The @var{string} can either be a number (decimal, octal or hex) or an
-arbitrary string (in which case it's converted to a number by
-computing CRC32).
-
-The @var{string} should be different for every file you compile.
-
-@item -fsched-verbose=@var{n}
-@opindex fsched-verbose
-On targets that use instruction scheduling, this option controls the
-amount of debugging output the scheduler prints to the dump files.
-
-For @var{n} greater than zero, @option{-fsched-verbose} outputs the
-same information as @option{-fdump-rtl-sched1} and @option{-fdump-rtl-sched2}.
-For @var{n} greater than one, it also output basic block probabilities,
-detailed ready list information and unit/insn info.  For @var{n} greater
-than two, it includes RTL at abort point, control-flow and regions info.
-And for @var{n} over four, @option{-fsched-verbose} also includes
-dependence info.
-
-@item -save-temps
-@itemx -save-temps=cwd
-@opindex save-temps
-Store the usual ``temporary'' intermediate files permanently; place them
-in the current directory and name them based on the source file.  Thus,
-compiling @file{foo.c} with @option{-c -save-temps} produces files
-@file{foo.i} and @file{foo.s}, as well as @file{foo.o}.  This creates a
-preprocessed @file{foo.i} output file even though the compiler now
-normally uses an integrated preprocessor.
-
-When used in combination with the @option{-x} command-line option,
-@option{-save-temps} is sensible enough to avoid over writing an
-input source file with the same extension as an intermediate file.
-The corresponding intermediate file may be obtained by renaming the
-source file before using @option{-save-temps}.
-
-If you invoke GCC in parallel, compiling several different source
-files that share a common base name in different subdirectories or the
-same source file compiled for multiple output destinations, it is
-likely that the different parallel compilers will interfere with each
-other, and overwrite the temporary files.  For instance:
-
-@smallexample
-gcc -save-temps -o outdir1/foo.o indir1/foo.c&
-gcc -save-temps -o outdir2/foo.o indir2/foo.c&
-@end smallexample
-
-may result in @file{foo.i} and @file{foo.o} being written to
-simultaneously by both compilers.
-
-@item -save-temps=obj
-@opindex save-temps=obj
-Store the usual ``temporary'' intermediate files permanently.  If the
-@option{-o} option is used, the temporary files are based on the
-object file.  If the @option{-o} option is not used, the
-@option{-save-temps=obj} switch behaves like @option{-save-temps}.
-
-For example:
-
-@smallexample
-gcc -save-temps=obj -c foo.c
-gcc -save-temps=obj -c bar.c -o dir/xbar.o
-gcc -save-temps=obj foobar.c -o dir2/yfoobar
-@end smallexample
-
-@noindent
-creates @file{foo.i}, @file{foo.s}, @file{dir/xbar.i},
-@file{dir/xbar.s}, @file{dir2/yfoobar.i}, @file{dir2/yfoobar.s}, and
-@file{dir2/yfoobar.o}.
-
-@item -time@r{[}=@var{file}@r{]}
-@opindex time
-Report the CPU time taken by each subprocess in the compilation
-sequence.  For C source files, this is the compiler proper and assembler
-(plus the linker if linking is done).
-
-Without the specification of an output file, the output looks like this:
-
-@smallexample
-# cc1 0.12 0.01
-# as 0.00 0.01
-@end smallexample
-
-The first number on each line is the ``user time'', that is time spent
-executing the program itself.  The second number is ``system time'',
-time spent executing operating system routines on behalf of the program.
-Both numbers are in seconds.
-
-With the specification of an output file, the output is appended to the
-named file, and it looks like this:
-
-@smallexample
-0.12 0.01 cc1 @var{options}
-0.00 0.01 as @var{options}
-@end smallexample
-
-The ``user time'' and the ``system time'' are moved before the program
-name, and the options passed to the program are displayed, so that one
-can later tell what file was being compiled, and with which options.
-
-@item -fvar-tracking
-@opindex fvar-tracking
-Run variable tracking pass.  It computes where variables are stored at each
-position in code.  Better debugging information is then generated
-(if the debugging information format supports this information).
-
-It is enabled by default when compiling with optimization (@option{-Os},
-@option{-O}, @option{-O2}, @dots{}), debugging information (@option{-g}) and
-the debug info format supports it.
-
-@item -fvar-tracking-assignments
-@opindex fvar-tracking-assignments
-@opindex fno-var-tracking-assignments
-Annotate assignments to user variables early in the compilation and
-attempt to carry the annotations over throughout the compilation all the
-way to the end, in an attempt to improve debug information while
-optimizing.  Use of @option{-gdwarf-4} is recommended along with it.
-
-It can be enabled even if var-tracking is disabled, in which case
-annotations are created and maintained, but discarded at the end.
-By default, this flag is enabled together with @option{-fvar-tracking},
-except when selective scheduling is enabled.
-
-@item -fvar-tracking-assignments-toggle
-@opindex fvar-tracking-assignments-toggle
-@opindex fno-var-tracking-assignments-toggle
-Toggle @option{-fvar-tracking-assignments}, in the same way that
-@option{-gtoggle} toggles @option{-g}.
-
-@item -print-file-name=@var{library}
-@opindex print-file-name
-Print the full absolute name of the library file @var{library} that
-would be used when linking---and don't do anything else.  With this
-option, GCC does not compile or link anything; it just prints the
-file name.
-
-@item -print-multi-directory
-@opindex print-multi-directory
-Print the directory name corresponding to the multilib selected by any
-other switches present in the command line.  This directory is supposed
-to exist in @env{GCC_EXEC_PREFIX}.
-
-@item -print-multi-lib
-@opindex print-multi-lib
-Print the mapping from multilib directory names to compiler switches
-that enable them.  The directory name is separated from the switches by
-@samp{;}, and each switch starts with an @samp{@@} instead of the
-@samp{-}, without spaces between multiple switches.  This is supposed to
-ease shell processing.
-
-@item -print-multi-os-directory
-@opindex print-multi-os-directory
-Print the path to OS libraries for the selected
-multilib, relative to some @file{lib} subdirectory.  If OS libraries are
-present in the @file{lib} subdirectory and no multilibs are used, this is
-usually just @file{.}, if OS libraries are present in @file{lib@var{suffix}}
-sibling directories this prints e.g.@: @file{../lib64}, @file{../lib} or
-@file{../lib32}, or if OS libraries are present in @file{lib/@var{subdir}}
-subdirectories it prints e.g.@: @file{amd64}, @file{sparcv9} or @file{ev6}.
-
-@item -print-multiarch
-@opindex print-multiarch
-Print the path to OS libraries for the selected multiarch,
-relative to some @file{lib} subdirectory.
-
-@item -print-prog-name=@var{program}
-@opindex print-prog-name
-Like @option{-print-file-name}, but searches for a program such as @command{cpp}.
-
-@item -print-libgcc-file-name
-@opindex print-libgcc-file-name
-Same as @option{-print-file-name=libgcc.a}.
-
-This is useful when you use @option{-nostdlib} or @option{-nodefaultlibs}
-but you do want to link with @file{libgcc.a}.  You can do:
-
-@smallexample
-gcc -nostdlib @var{files}@dots{} `gcc -print-libgcc-file-name`
-@end smallexample
-
-@item -print-search-dirs
-@opindex print-search-dirs
-Print the name of the configured installation directory and a list of
-program and library directories @command{gcc} searches---and don't do anything else.
-
-This is useful when @command{gcc} prints the error message
-@samp{installation problem, cannot exec cpp0: No such file or directory}.
-To resolve this you either need to put @file{cpp0} and the other compiler
-components where @command{gcc} expects to find them, or you can set the environment
-variable @env{GCC_EXEC_PREFIX} to the directory where you installed them.
-Don't forget the trailing @samp{/}.
-@xref{Environment Variables}.
-
-@item -print-sysroot
-@opindex print-sysroot
-Print the target sysroot directory that is used during
-compilation.  This is the target sysroot specified either at configure
-time or using the @option{--sysroot} option, possibly with an extra
-suffix that depends on compilation options.  If no target sysroot is
-specified, the option prints nothing.
-
-@item -print-sysroot-headers-suffix
-@opindex print-sysroot-headers-suffix
-Print the suffix added to the target sysroot when searching for
-headers, or give an error if the compiler is not configured with such
-a suffix---and don't do anything else.
-
-@item -dumpmachine
-@opindex dumpmachine
-Print the compiler's target machine (for example,
-@samp{i686-pc-linux-gnu})---and don't do anything else.
-
-@item -dumpversion
-@opindex dumpversion
-Print the compiler version (for example, @code{3.0})---and don't do
-anything else.
-
-@item -dumpspecs
-@opindex dumpspecs
-Print the compiler's built-in specs---and don't do anything else.  (This
-is used when GCC itself is being built.)  @xref{Spec Files}.
-
 @item -fno-eliminate-unused-debug-types
 @opindex feliminate-unused-debug-types
 @opindex fno-eliminate-unused-debug-types
@@ -7988,12 +6813,6 @@ Disable sharing of stack slots allocated for pseudo-registers.  Each
 pseudo-register that does not get a hard register gets a separate
 stack slot, and as a result function stack frames are larger.
 
-@item -fira-verbose=@var{n}
-@opindex fira-verbose
-Control the verbosity of the dump file for the integrated register allocator.
-The default value is 5.  If the value @var{n} is greater or equal to 10,
-the dump output is sent to stderr using the same format as @var{n} minus 10.
-
 @item -flra-remat
 @opindex flra-remat
 Enable CFG-sensitive rematerialization in LRA.  Instead of loading
@@ -9227,20 +8046,6 @@ values are 0 (no compression) to 9 (maximum compression).  Values
 outside this range are clamped to either 0 or 9.  If the option is not
 given, a default balanced compression setting is used.
 
-@item -flto-report
-@opindex flto-report
-Prints a report with internal details on the workings of the link-time
-optimizer.  The contents of this report vary from version to version.
-It is meant to be useful to GCC developers when processing object
-files in LTO mode (via @option{-flto}).
-
-Disabled by default.
-
-@item -flto-report-wpa
-@opindex flto-report-wpa
-Like @option{-flto-report}, but only print for the WPA phase of Link
-Time Optimization.
-
 @item -fuse-linker-plugin
 @opindex fuse-linker-plugin
 Enables the use of a linker plugin during link-time optimization.  This
@@ -12610,6 +11415,1234 @@ the implementation of the @file{libatomic} runtime library.
 
 @end table
 
+@node Developer Options
+@section GCC Developer Options
+@cindex developer options
+@cindex debugging GCC
+@cindex debug dump options
+@cindex dump options
+@cindex compilation statistics
+
+This section describes command-line options that are primarily of
+interest to GCC developers, including options to support compiler
+testing and investigation of compiler bugs and compile-time
+performance problems.  This includes options that produce debug dumps
+at various points in the compilation; that print statistics such as
+memory use and execution time; and that print information about GCC's
+configuration, such as where it searches for libraries.  You should
+rarely need to use any of these options for ordinary compilation and
+linking tasks.
+
+@table @gcctabopt
+
+@item -d@var{letters}
+@itemx -fdump-rtl-@var{pass}
+@itemx -fdump-rtl-@var{pass}=@var{filename}
+@opindex d
+@opindex fdump-rtl-@var{pass}
+Says to make debugging dumps during compilation at times specified by
+@var{letters}.  This is used for debugging the RTL-based passes of the
+compiler.  The file names for most of the dumps are made by appending
+a pass number and a word to the @var{dumpname}, and the files are
+created in the directory of the output file.  In case of
+@option{=@var{filename}} option, the dump is output on the given file
+instead of the pass numbered dump files.  Note that the pass number is
+assigned as passes are registered into the pass manager.  Most passes
+are registered in the order that they will execute and for these passes
+the number corresponds to the pass execution order.  However, passes
+registered by plugins, passes specific to compilation targets, or
+passes that are otherwise registered after all the other passes are
+numbered higher than a pass named "final", even if they are executed
+earlier.  @var{dumpname} is generated from the name of the output
+file if explicitly specified and not an executable, otherwise it is
+the basename of the source file.  These switches may have different
+effects when @option{-E} is used for preprocessing.
+
+Debug dumps can be enabled with a @option{-fdump-rtl} switch or some
+@option{-d} option @var{letters}.  Here are the possible
+letters for use in @var{pass} and @var{letters}, and their meanings:
+
+@table @gcctabopt
+
+@item -fdump-rtl-alignments
+@opindex fdump-rtl-alignments
+Dump after branch alignments have been computed.
+
+@item -fdump-rtl-asmcons
+@opindex fdump-rtl-asmcons
+Dump after fixing rtl statements that have unsatisfied in/out constraints.
+
+@item -fdump-rtl-auto_inc_dec
+@opindex fdump-rtl-auto_inc_dec
+Dump after auto-inc-dec discovery.  This pass is only run on
+architectures that have auto inc or auto dec instructions.
+
+@item -fdump-rtl-barriers
+@opindex fdump-rtl-barriers
+Dump after cleaning up the barrier instructions.
+
+@item -fdump-rtl-bbpart
+@opindex fdump-rtl-bbpart
+Dump after partitioning hot and cold basic blocks.
+
+@item -fdump-rtl-bbro
+@opindex fdump-rtl-bbro
+Dump after block reordering.
+
+@item -fdump-rtl-btl1
+@itemx -fdump-rtl-btl2
+@opindex fdump-rtl-btl2
+@opindex fdump-rtl-btl2
+@option{-fdump-rtl-btl1} and @option{-fdump-rtl-btl2} enable dumping
+after the two branch
+target load optimization passes.
+
+@item -fdump-rtl-bypass
+@opindex fdump-rtl-bypass
+Dump after jump bypassing and control flow optimizations.
+
+@item -fdump-rtl-combine
+@opindex fdump-rtl-combine
+Dump after the RTL instruction combination pass.
+
+@item -fdump-rtl-compgotos
+@opindex fdump-rtl-compgotos
+Dump after duplicating the computed gotos.
+
+@item -fdump-rtl-ce1
+@itemx -fdump-rtl-ce2
+@itemx -fdump-rtl-ce3
+@opindex fdump-rtl-ce1
+@opindex fdump-rtl-ce2
+@opindex fdump-rtl-ce3
+@option{-fdump-rtl-ce1}, @option{-fdump-rtl-ce2}, and
+@option{-fdump-rtl-ce3} enable dumping after the three
+if conversion passes.
+
+@item -fdump-rtl-cprop_hardreg
+@opindex fdump-rtl-cprop_hardreg
+Dump after hard register copy propagation.
+
+@item -fdump-rtl-csa
+@opindex fdump-rtl-csa
+Dump after combining stack adjustments.
+
+@item -fdump-rtl-cse1
+@itemx -fdump-rtl-cse2
+@opindex fdump-rtl-cse1
+@opindex fdump-rtl-cse2
+@option{-fdump-rtl-cse1} and @option{-fdump-rtl-cse2} enable dumping after
+the two common subexpression elimination passes.
+
+@item -fdump-rtl-dce
+@opindex fdump-rtl-dce
+Dump after the standalone dead code elimination passes.
+
+@item -fdump-rtl-dbr
+@opindex fdump-rtl-dbr
+Dump after delayed branch scheduling.
+
+@item -fdump-rtl-dce1
+@itemx -fdump-rtl-dce2
+@opindex fdump-rtl-dce1
+@opindex fdump-rtl-dce2
+@option{-fdump-rtl-dce1} and @option{-fdump-rtl-dce2} enable dumping after
+the two dead store elimination passes.
+
+@item -fdump-rtl-eh
+@opindex fdump-rtl-eh
+Dump after finalization of EH handling code.
+
+@item -fdump-rtl-eh_ranges
+@opindex fdump-rtl-eh_ranges
+Dump after conversion of EH handling range regions.
+
+@item -fdump-rtl-expand
+@opindex fdump-rtl-expand
+Dump after RTL generation.
+
+@item -fdump-rtl-fwprop1
+@itemx -fdump-rtl-fwprop2
+@opindex fdump-rtl-fwprop1
+@opindex fdump-rtl-fwprop2
+@option{-fdump-rtl-fwprop1} and @option{-fdump-rtl-fwprop2} enable
+dumping after the two forward propagation passes.
+
+@item -fdump-rtl-gcse1
+@itemx -fdump-rtl-gcse2
+@opindex fdump-rtl-gcse1
+@opindex fdump-rtl-gcse2
+@option{-fdump-rtl-gcse1} and @option{-fdump-rtl-gcse2} enable dumping
+after global common subexpression elimination.
+
+@item -fdump-rtl-init-regs
+@opindex fdump-rtl-init-regs
+Dump after the initialization of the registers.
+
+@item -fdump-rtl-initvals
+@opindex fdump-rtl-initvals
+Dump after the computation of the initial value sets.
+
+@item -fdump-rtl-into_cfglayout
+@opindex fdump-rtl-into_cfglayout
+Dump after converting to cfglayout mode.
+
+@item -fdump-rtl-ira
+@opindex fdump-rtl-ira
+Dump after iterated register allocation.
+
+@item -fdump-rtl-jump
+@opindex fdump-rtl-jump
+Dump after the second jump optimization.
+
+@item -fdump-rtl-loop2
+@opindex fdump-rtl-loop2
+@option{-fdump-rtl-loop2} enables dumping after the rtl
+loop optimization passes.
+
+@item -fdump-rtl-mach
+@opindex fdump-rtl-mach
+Dump after performing the machine dependent reorganization pass, if that
+pass exists.
+
+@item -fdump-rtl-mode_sw
+@opindex fdump-rtl-mode_sw
+Dump after removing redundant mode switches.
+
+@item -fdump-rtl-rnreg
+@opindex fdump-rtl-rnreg
+Dump after register renumbering.
+
+@item -fdump-rtl-outof_cfglayout
+@opindex fdump-rtl-outof_cfglayout
+Dump after converting from cfglayout mode.
+
+@item -fdump-rtl-peephole2
+@opindex fdump-rtl-peephole2
+Dump after the peephole pass.
+
+@item -fdump-rtl-postreload
+@opindex fdump-rtl-postreload
+Dump after post-reload optimizations.
+
+@item -fdump-rtl-pro_and_epilogue
+@opindex fdump-rtl-pro_and_epilogue
+Dump after generating the function prologues and epilogues.
+
+@item -fdump-rtl-sched1
+@itemx -fdump-rtl-sched2
+@opindex fdump-rtl-sched1
+@opindex fdump-rtl-sched2
+@option{-fdump-rtl-sched1} and @option{-fdump-rtl-sched2} enable dumping
+after the basic block scheduling passes.
+
+@item -fdump-rtl-ree
+@opindex fdump-rtl-ree
+Dump after sign/zero extension elimination.
+
+@item -fdump-rtl-seqabstr
+@opindex fdump-rtl-seqabstr
+Dump after common sequence discovery.
+
+@item -fdump-rtl-shorten
+@opindex fdump-rtl-shorten
+Dump after shortening branches.
+
+@item -fdump-rtl-sibling
+@opindex fdump-rtl-sibling
+Dump after sibling call optimizations.
+
+@item -fdump-rtl-split1
+@itemx -fdump-rtl-split2
+@itemx -fdump-rtl-split3
+@itemx -fdump-rtl-split4
+@itemx -fdump-rtl-split5
+@opindex fdump-rtl-split1
+@opindex fdump-rtl-split2
+@opindex fdump-rtl-split3
+@opindex fdump-rtl-split4
+@opindex fdump-rtl-split5
+These options enable dumping after five rounds of
+instruction splitting.
+
+@item -fdump-rtl-sms
+@opindex fdump-rtl-sms
+Dump after modulo scheduling.  This pass is only run on some
+architectures.
+
+@item -fdump-rtl-stack
+@opindex fdump-rtl-stack
+Dump after conversion from GCC's ``flat register file'' registers to the
+x87's stack-like registers.  This pass is only run on x86 variants.
+
+@item -fdump-rtl-subreg1
+@itemx -fdump-rtl-subreg2
+@opindex fdump-rtl-subreg1
+@opindex fdump-rtl-subreg2
+@option{-fdump-rtl-subreg1} and @option{-fdump-rtl-subreg2} enable dumping after
+the two subreg expansion passes.
+
+@item -fdump-rtl-unshare
+@opindex fdump-rtl-unshare
+Dump after all rtl has been unshared.
+
+@item -fdump-rtl-vartrack
+@opindex fdump-rtl-vartrack
+Dump after variable tracking.
+
+@item -fdump-rtl-vregs
+@opindex fdump-rtl-vregs
+Dump after converting virtual registers to hard registers.
+
+@item -fdump-rtl-web
+@opindex fdump-rtl-web
+Dump after live range splitting.
+
+@item -fdump-rtl-regclass
+@itemx -fdump-rtl-subregs_of_mode_init
+@itemx -fdump-rtl-subregs_of_mode_finish
+@itemx -fdump-rtl-dfinit
+@itemx -fdump-rtl-dfinish
+@opindex fdump-rtl-regclass
+@opindex fdump-rtl-subregs_of_mode_init
+@opindex fdump-rtl-subregs_of_mode_finish
+@opindex fdump-rtl-dfinit
+@opindex fdump-rtl-dfinish
+These dumps are defined but always produce empty files.
+
+@item -da
+@itemx -fdump-rtl-all
+@opindex da
+@opindex fdump-rtl-all
+Produce all the dumps listed above.
+
+@item -dA
+@opindex dA
+Annotate the assembler output with miscellaneous debugging information.
+
+@item -dD
+@opindex dD
+Dump all macro definitions, at the end of preprocessing, in addition to
+normal output.
+
+@item -dH
+@opindex dH
+Produce a core dump whenever an error occurs.
+
+@item -dp
+@opindex dp
+Annotate the assembler output with a comment indicating which
+pattern and alternative is used.  The length of each instruction is
+also printed.
+
+@item -dP
+@opindex dP
+Dump the RTL in the assembler output as a comment before each instruction.
+Also turns on @option{-dp} annotation.
+
+@item -dx
+@opindex dx
+Just generate RTL for a function instead of compiling it.  Usually used
+with @option{-fdump-rtl-expand}.
+@end table
+
+@item -fdump-noaddr
+@opindex fdump-noaddr
+When doing debugging dumps, suppress address output.  This makes it more
+feasible to use diff on debugging dumps for compiler invocations with
+different compiler binaries and/or different
+text / bss / data / heap / stack / dso start locations.
+
+@item -freport-bug
+@opindex freport-bug
+Collect and dump debug information into temporary file if ICE in C/C++
+compiler occured.
+
+@item -fdump-unnumbered
+@opindex fdump-unnumbered
+When doing debugging dumps, suppress instruction numbers and address output.
+This makes it more feasible to use diff on debugging dumps for compiler
+invocations with different options, in particular with and without
+@option{-g}.
+
+@item -fdump-unnumbered-links
+@opindex fdump-unnumbered-links
+When doing debugging dumps (see @option{-d} option above), suppress
+instruction numbers for the links to the previous and next instructions
+in a sequence.
+
+@item -fdump-translation-unit @r{(C++ only)}
+@itemx -fdump-translation-unit-@var{options} @r{(C++ only)}
+@opindex fdump-translation-unit
+Dump a representation of the tree structure for the entire translation
+unit to a file.  The file name is made by appending @file{.tu} to the
+source file name, and the file is created in the same directory as the
+output file.  If the @samp{-@var{options}} form is used, @var{options}
+controls the details of the dump as described for the
+@option{-fdump-tree} options.
+
+@item -fdump-class-hierarchy @r{(C++ only)}
+@itemx -fdump-class-hierarchy-@var{options} @r{(C++ only)}
+@opindex fdump-class-hierarchy
+Dump a representation of each class's hierarchy and virtual function
+table layout to a file.  The file name is made by appending
+@file{.class} to the source file name, and the file is created in the
+same directory as the output file.  If the @samp{-@var{options}} form
+is used, @var{options} controls the details of the dump as described
+for the @option{-fdump-tree} options.
+
+@item -fdump-ipa-@var{switch}
+@opindex fdump-ipa
+Control the dumping at various stages of inter-procedural analysis
+language tree to a file.  The file name is generated by appending a
+switch specific suffix to the source file name, and the file is created
+in the same directory as the output file.  The following dumps are
+possible:
+
+@table @samp
+@item all
+Enables all inter-procedural analysis dumps.
+
+@item cgraph
+Dumps information about call-graph optimization, unused function removal,
+and inlining decisions.
+
+@item inline
+Dump after function inlining.
+
+@end table
+
+@item -fdump-passes
+@opindex fdump-passes
+Dump the list of optimization passes that are turned on and off by
+the current command-line options.
+
+@item -fdump-statistics-@var{option}
+@opindex fdump-statistics
+Enable and control dumping of pass statistics in a separate file.  The
+file name is generated by appending a suffix ending in
+@samp{.statistics} to the source file name, and the file is created in
+the same directory as the output file.  If the @samp{-@var{option}}
+form is used, @samp{-stats} causes counters to be summed over the
+whole compilation unit while @samp{-details} dumps every event as
+the passes generate them.  The default with no option is to sum
+counters for each function compiled.
+
+@item -fdump-tree-@var{switch}
+@itemx -fdump-tree-@var{switch}-@var{options}
+@itemx -fdump-tree-@var{switch}-@var{options}=@var{filename}
+@opindex fdump-tree
+Control the dumping at various stages of processing the intermediate
+language tree to a file.  The file name is generated by appending a
+switch-specific suffix to the source file name, and the file is
+created in the same directory as the output file. In case of
+@option{=@var{filename}} option, the dump is output on the given file
+instead of the auto named dump files.  If the @samp{-@var{options}}
+form is used, @var{options} is a list of @samp{-} separated options
+which control the details of the dump.  Not all options are applicable
+to all dumps; those that are not meaningful are ignored.  The
+following options are available
+
+@table @samp
+@item address
+Print the address of each node.  Usually this is not meaningful as it
+changes according to the environment and source file.  Its primary use
+is for tying up a dump file with a debug environment.
+@item asmname
+If @code{DECL_ASSEMBLER_NAME} has been set for a given decl, use that
+in the dump instead of @code{DECL_NAME}.  Its primary use is ease of
+use working backward from mangled names in the assembly file.
+@item slim
+When dumping front-end intermediate representations, inhibit dumping
+of members of a scope or body of a function merely because that scope
+has been reached.  Only dump such items when they are directly reachable
+by some other path.
+
+When dumping pretty-printed trees, this option inhibits dumping the
+bodies of control structures.
+
+When dumping RTL, print the RTL in slim (condensed) form instead of
+the default LISP-like representation.
+@item raw
+Print a raw representation of the tree.  By default, trees are
+pretty-printed into a C-like representation.
+@item details
+Enable more detailed dumps (not honored by every dump option). Also
+include information from the optimization passes.
+@item stats
+Enable dumping various statistics about the pass (not honored by every dump
+option).
+@item blocks
+Enable showing basic block boundaries (disabled in raw dumps).
+@item graph
+For each of the other indicated dump files (@option{-fdump-rtl-@var{pass}}),
+dump a representation of the control flow graph suitable for viewing with
+GraphViz to @file{@var{file}.@var{passid}.@var{pass}.dot}.  Each function in
+the file is pretty-printed as a subgraph, so that GraphViz can render them
+all in a single plot.
+
+This option currently only works for RTL dumps, and the RTL is always
+dumped in slim form.
+@item vops
+Enable showing virtual operands for every statement.
+@item lineno
+Enable showing line numbers for statements.
+@item uid
+Enable showing the unique ID (@code{DECL_UID}) for each variable.
+@item verbose
+Enable showing the tree dump for each statement.
+@item eh
+Enable showing the EH region number holding each statement.
+@item scev
+Enable showing scalar evolution analysis details.
+@item optimized
+Enable showing optimization information (only available in certain
+passes).
+@item missed
+Enable showing missed optimization information (only available in certain
+passes).
+@item note
+Enable other detailed optimization information (only available in
+certain passes).
+@item =@var{filename}
+Instead of an auto named dump file, output into the given file
+name. The file names @file{stdout} and @file{stderr} are treated
+specially and are considered already open standard streams. For
+example,
+
+@smallexample
+gcc -O2 -ftree-vectorize -fdump-tree-vect-blocks=foo.dump
+     -fdump-tree-pre=stderr file.c
+@end smallexample
+
+outputs vectorizer dump into @file{foo.dump}, while the PRE dump is
+output on to @file{stderr}. If two conflicting dump filenames are
+given for the same pass, then the latter option overrides the earlier
+one.
+
+@item split-paths
+@opindex fdump-tree-split-paths
+Dump each function after splitting paths to loop backedges.  The file
+name is made by appending @file{.split-paths} to the source file name.
+
+@item all
+Turn on all options, except @option{raw}, @option{slim}, @option{verbose}
+and @option{lineno}.
+
+@item optall
+Turn on all optimization options, i.e., @option{optimized},
+@option{missed}, and @option{note}.
+@end table
+
+The following tree dumps are possible:
+@table @samp
+
+@item original
+@opindex fdump-tree-original
+Dump before any tree based optimization, to @file{@var{file}.original}.
+
+@item optimized
+@opindex fdump-tree-optimized
+Dump after all tree based optimization, to @file{@var{file}.optimized}.
+
+@item gimple
+@opindex fdump-tree-gimple
+Dump each function before and after the gimplification pass to a file.  The
+file name is made by appending @file{.gimple} to the source file name.
+
+@item cfg
+@opindex fdump-tree-cfg
+Dump the control flow graph of each function to a file.  The file name is
+made by appending @file{.cfg} to the source file name.
+
+@item ch
+@opindex fdump-tree-ch
+Dump each function after copying loop headers.  The file name is made by
+appending @file{.ch} to the source file name.
+
+@item ssa
+@opindex fdump-tree-ssa
+Dump SSA related information to a file.  The file name is made by appending
+@file{.ssa} to the source file name.
+
+@item alias
+@opindex fdump-tree-alias
+Dump aliasing information for each function.  The file name is made by
+appending @file{.alias} to the source file name.
+
+@item ccp
+@opindex fdump-tree-ccp
+Dump each function after CCP@.  The file name is made by appending
+@file{.ccp} to the source file name.
+
+@item storeccp
+@opindex fdump-tree-storeccp
+Dump each function after STORE-CCP@.  The file name is made by appending
+@file{.storeccp} to the source file name.
+
+@item pre
+@opindex fdump-tree-pre
+Dump trees after partial redundancy elimination.  The file name is made
+by appending @file{.pre} to the source file name.
+
+@item fre
+@opindex fdump-tree-fre
+Dump trees after full redundancy elimination.  The file name is made
+by appending @file{.fre} to the source file name.
+
+@item copyprop
+@opindex fdump-tree-copyprop
+Dump trees after copy propagation.  The file name is made
+by appending @file{.copyprop} to the source file name.
+
+@item store_copyprop
+@opindex fdump-tree-store_copyprop
+Dump trees after store copy-propagation.  The file name is made
+by appending @file{.store_copyprop} to the source file name.
+
+@item dce
+@opindex fdump-tree-dce
+Dump each function after dead code elimination.  The file name is made by
+appending @file{.dce} to the source file name.
+
+@item sra
+@opindex fdump-tree-sra
+Dump each function after performing scalar replacement of aggregates.  The
+file name is made by appending @file{.sra} to the source file name.
+
+@item sink
+@opindex fdump-tree-sink
+Dump each function after performing code sinking.  The file name is made
+by appending @file{.sink} to the source file name.
+
+@item dom
+@opindex fdump-tree-dom
+Dump each function after applying dominator tree optimizations.  The file
+name is made by appending @file{.dom} to the source file name.
+
+@item dse
+@opindex fdump-tree-dse
+Dump each function after applying dead store elimination.  The file
+name is made by appending @file{.dse} to the source file name.
+
+@item phiopt
+@opindex fdump-tree-phiopt
+Dump each function after optimizing PHI nodes into straightline code.  The file
+name is made by appending @file{.phiopt} to the source file name.
+
+@item backprop
+@opindex fdump-tree-backprop
+Dump each function after back-propagating use information up the definition
+chain.  The file name is made by appending @file{.backprop} to the
+source file name.
+
+@item forwprop
+@opindex fdump-tree-forwprop
+Dump each function after forward propagating single use variables.  The file
+name is made by appending @file{.forwprop} to the source file name.
+
+@item nrv
+@opindex fdump-tree-nrv
+Dump each function after applying the named return value optimization on
+generic trees.  The file name is made by appending @file{.nrv} to the source
+file name.
+
+@item vect
+@opindex fdump-tree-vect
+Dump each function after applying vectorization of loops.  The file name is
+made by appending @file{.vect} to the source file name.
+
+@item slp
+@opindex fdump-tree-slp
+Dump each function after applying vectorization of basic blocks.  The file name
+is made by appending @file{.slp} to the source file name.
+
+@item vrp
+@opindex fdump-tree-vrp
+Dump each function after Value Range Propagation (VRP).  The file name
+is made by appending @file{.vrp} to the source file name.
+
+@item oaccdevlow
+@opindex fdump-tree-oaccdevlow
+Dump each function after applying device-specific OpenACC transformations.
+The file name is made by appending @file{.oaccdevlow} to the source file name.
+
+@item all
+@opindex fdump-tree-all
+Enable all the available tree dumps with the flags provided in this option.
+@end table
+
+@item -fopt-info
+@itemx -fopt-info-@var{options}
+@itemx -fopt-info-@var{options}=@var{filename}
+@opindex fopt-info
+Controls optimization dumps from various optimization passes. If the
+@samp{-@var{options}} form is used, @var{options} is a list of
+@samp{-} separated option keywords to select the dump details and
+optimizations.  
+
+The @var{options} can be divided into two groups: options describing the
+verbosity of the dump, and options describing which optimizations
+should be included. The options from both the groups can be freely
+mixed as they are non-overlapping. However, in case of any conflicts,
+the later options override the earlier options on the command
+line. 
+
+The following options control the dump verbosity:
+
+@table @samp
+@item optimized
+Print information when an optimization is successfully applied. It is
+up to a pass to decide which information is relevant. For example, the
+vectorizer passes print the source location of loops which are
+successfully vectorized.
+@item missed
+Print information about missed optimizations. Individual passes
+control which information to include in the output. 
+@item note
+Print verbose information about optimizations, such as certain
+transformations, more detailed messages about decisions etc.
+@item all
+Print detailed optimization information. This includes
+@samp{optimized}, @samp{missed}, and @samp{note}.
+@end table
+
+One or more of the following option keywords can be used to describe a
+group of optimizations:
+
+@table @samp
+@item ipa
+Enable dumps from all interprocedural optimizations.
+@item loop
+Enable dumps from all loop optimizations.
+@item inline
+Enable dumps from all inlining optimizations.
+@item vec
+Enable dumps from all vectorization optimizations.
+@item optall
+Enable dumps from all optimizations. This is a superset of
+the optimization groups listed above.
+@end table
+
+If @var{options} is
+omitted, it defaults to @samp{optimized-optall}, which means to dump all
+info about successful optimizations from all the passes.  
+
+If the @var{filename} is provided, then the dumps from all the
+applicable optimizations are concatenated into the @var{filename}.
+Otherwise the dump is output onto @file{stderr}. Though multiple
+@option{-fopt-info} options are accepted, only one of them can include
+a @var{filename}. If other filenames are provided then all but the
+first such option are ignored.
+
+Note that the output @var{filename} is overwritten
+in case of multiple translation units. If a combined output from
+multiple translation units is desired, @file{stderr} should be used
+instead.
+
+In the following example, the optimization info is output to
+@file{stderr}:
+
+@smallexample
+gcc -O3 -fopt-info
+@end smallexample
+
+This example:
+@smallexample
+gcc -O3 -fopt-info-missed=missed.all
+@end smallexample
+
+@noindent
+outputs missed optimization report from all the passes into
+@file{missed.all}, and this one:
+
+@smallexample
+gcc -O2 -ftree-vectorize -fopt-info-vec-missed
+@end smallexample
+
+@noindent
+prints information about missed optimization opportunities from
+vectorization passes on @file{stderr}.  
+Note that @option{-fopt-info-vec-missed} is equivalent to 
+@option{-fopt-info-missed-vec}.
+
+As another example,
+@smallexample
+gcc -O3 -fopt-info-inline-optimized-missed=inline.txt
+@end smallexample
+
+@noindent
+outputs information about missed optimizations as well as
+optimized locations from all the inlining passes into
+@file{inline.txt}.
+
+Finally, consider:
+
+@smallexample
+gcc -fopt-info-vec-missed=vec.miss -fopt-info-loop-optimized=loop.opt
+@end smallexample
+
+@noindent
+Here the two output filenames @file{vec.miss} and @file{loop.opt} are
+in conflict since only one output file is allowed. In this case, only
+the first option takes effect and the subsequent options are
+ignored. Thus only @file{vec.miss} is produced which contains
+dumps from the vectorizer about missed opportunities.
+
+@item -fsched-verbose=@var{n}
+@opindex fsched-verbose
+On targets that use instruction scheduling, this option controls the
+amount of debugging output the scheduler prints to the dump files.
+
+For @var{n} greater than zero, @option{-fsched-verbose} outputs the
+same information as @option{-fdump-rtl-sched1} and @option{-fdump-rtl-sched2}.
+For @var{n} greater than one, it also output basic block probabilities,
+detailed ready list information and unit/insn info.  For @var{n} greater
+than two, it includes RTL at abort point, control-flow and regions info.
+And for @var{n} over four, @option{-fsched-verbose} also includes
+dependence info.
+
+
+
+@item -fenable-@var{kind}-@var{pass}
+@itemx -fdisable-@var{kind}-@var{pass}=@var{range-list}
+@opindex fdisable-
+@opindex fenable-
+
+This is a set of options that are used to explicitly disable/enable
+optimization passes.  These options are intended for use for debugging GCC.
+Compiler users should use regular options for enabling/disabling
+passes instead.
+
+@table @gcctabopt
+
+@item -fdisable-ipa-@var{pass}
+Disable IPA pass @var{pass}. @var{pass} is the pass name.  If the same pass is
+statically invoked in the compiler multiple times, the pass name should be
+appended with a sequential number starting from 1.
+
+@item -fdisable-rtl-@var{pass}
+@itemx -fdisable-rtl-@var{pass}=@var{range-list}
+Disable RTL pass @var{pass}.  @var{pass} is the pass name.  If the same pass is
+statically invoked in the compiler multiple times, the pass name should be
+appended with a sequential number starting from 1.  @var{range-list} is a 
+comma-separated list of function ranges or assembler names.  Each range is a number
+pair separated by a colon.  The range is inclusive in both ends.  If the range
+is trivial, the number pair can be simplified as a single number.  If the
+function's call graph node's @var{uid} falls within one of the specified ranges,
+the @var{pass} is disabled for that function.  The @var{uid} is shown in the
+function header of a dump file, and the pass names can be dumped by using
+option @option{-fdump-passes}.
+
+@item -fdisable-tree-@var{pass}
+@itemx -fdisable-tree-@var{pass}=@var{range-list}
+Disable tree pass @var{pass}.  See @option{-fdisable-rtl} for the description of
+option arguments.
+
+@item -fenable-ipa-@var{pass}
+Enable IPA pass @var{pass}.  @var{pass} is the pass name.  If the same pass is
+statically invoked in the compiler multiple times, the pass name should be
+appended with a sequential number starting from 1.
+
+@item -fenable-rtl-@var{pass}
+@itemx -fenable-rtl-@var{pass}=@var{range-list}
+Enable RTL pass @var{pass}.  See @option{-fdisable-rtl} for option argument
+description and examples.
+
+@item -fenable-tree-@var{pass}
+@itemx -fenable-tree-@var{pass}=@var{range-list}
+Enable tree pass @var{pass}.  See @option{-fdisable-rtl} for the description
+of option arguments.
+
+@end table
+
+Here are some examples showing uses of these options.
+
+@smallexample
+
+# disable ccp1 for all functions
+   -fdisable-tree-ccp1
+# disable complete unroll for function whose cgraph node uid is 1
+   -fenable-tree-cunroll=1
+# disable gcse2 for functions at the following ranges [1,1],
+# [300,400], and [400,1000]
+# disable gcse2 for functions foo and foo2
+   -fdisable-rtl-gcse2=foo,foo2
+# disable early inlining
+   -fdisable-tree-einline
+# disable ipa inlining
+   -fdisable-ipa-inline
+# enable tree full unroll
+   -fenable-tree-unroll
+
+@end smallexample
+
+@item -fchecking
+@opindex fchecking
+@opindex fno-checking
+Enable internal consistency checking.  The default depends on
+the compiler configuration.
+
+@item -frandom-seed=@var{string}
+@opindex frandom-seed
+This option provides a seed that GCC uses in place of
+random numbers in generating certain symbol names
+that have to be different in every compiled file.  It is also used to
+place unique stamps in coverage data files and the object files that
+produce them.  You can use the @option{-frandom-seed} option to produce
+reproducibly identical object files.
+
+The @var{string} can either be a number (decimal, octal or hex) or an
+arbitrary string (in which case it's converted to a number by
+computing CRC32).
+
+The @var{string} should be different for every file you compile.
+
+@item -save-temps
+@itemx -save-temps=cwd
+@opindex save-temps
+Store the usual ``temporary'' intermediate files permanently; place them
+in the current directory and name them based on the source file.  Thus,
+compiling @file{foo.c} with @option{-c -save-temps} produces files
+@file{foo.i} and @file{foo.s}, as well as @file{foo.o}.  This creates a
+preprocessed @file{foo.i} output file even though the compiler now
+normally uses an integrated preprocessor.
+
+When used in combination with the @option{-x} command-line option,
+@option{-save-temps} is sensible enough to avoid over writing an
+input source file with the same extension as an intermediate file.
+The corresponding intermediate file may be obtained by renaming the
+source file before using @option{-save-temps}.
+
+If you invoke GCC in parallel, compiling several different source
+files that share a common base name in different subdirectories or the
+same source file compiled for multiple output destinations, it is
+likely that the different parallel compilers will interfere with each
+other, and overwrite the temporary files.  For instance:
+
+@smallexample
+gcc -save-temps -o outdir1/foo.o indir1/foo.c&
+gcc -save-temps -o outdir2/foo.o indir2/foo.c&
+@end smallexample
+
+may result in @file{foo.i} and @file{foo.o} being written to
+simultaneously by both compilers.
+
+@item -save-temps=obj
+@opindex save-temps=obj
+Store the usual ``temporary'' intermediate files permanently.  If the
+@option{-o} option is used, the temporary files are based on the
+object file.  If the @option{-o} option is not used, the
+@option{-save-temps=obj} switch behaves like @option{-save-temps}.
+
+For example:
+
+@smallexample
+gcc -save-temps=obj -c foo.c
+gcc -save-temps=obj -c bar.c -o dir/xbar.o
+gcc -save-temps=obj foobar.c -o dir2/yfoobar
+@end smallexample
+
+@noindent
+creates @file{foo.i}, @file{foo.s}, @file{dir/xbar.i},
+@file{dir/xbar.s}, @file{dir2/yfoobar.i}, @file{dir2/yfoobar.s}, and
+@file{dir2/yfoobar.o}.
+
+@item -time@r{[}=@var{file}@r{]}
+@opindex time
+Report the CPU time taken by each subprocess in the compilation
+sequence.  For C source files, this is the compiler proper and assembler
+(plus the linker if linking is done).
+
+Without the specification of an output file, the output looks like this:
+
+@smallexample
+# cc1 0.12 0.01
+# as 0.00 0.01
+@end smallexample
+
+The first number on each line is the ``user time'', that is time spent
+executing the program itself.  The second number is ``system time'',
+time spent executing operating system routines on behalf of the program.
+Both numbers are in seconds.
+
+With the specification of an output file, the output is appended to the
+named file, and it looks like this:
+
+@smallexample
+0.12 0.01 cc1 @var{options}
+0.00 0.01 as @var{options}
+@end smallexample
+
+The ``user time'' and the ``system time'' are moved before the program
+name, and the options passed to the program are displayed, so that one
+can later tell what file was being compiled, and with which options.
+
+@item -fdump-final-insns@r{[}=@var{file}@r{]}
+@opindex fdump-final-insns
+Dump the final internal representation (RTL) to @var{file}.  If the
+optional argument is omitted (or if @var{file} is @code{.}), the name
+of the dump file is determined by appending @code{.gkd} to the
+compilation output file name.
+
+@item -fcompare-debug@r{[}=@var{opts}@r{]}
+@opindex fcompare-debug
+@opindex fno-compare-debug
+If no error occurs during compilation, run the compiler a second time,
+adding @var{opts} and @option{-fcompare-debug-second} to the arguments
+passed to the second compilation.  Dump the final internal
+representation in both compilations, and print an error if they differ.
+
+If the equal sign is omitted, the default @option{-gtoggle} is used.
+
+The environment variable @env{GCC_COMPARE_DEBUG}, if defined, non-empty
+and nonzero, implicitly enables @option{-fcompare-debug}.  If
+@env{GCC_COMPARE_DEBUG} is defined to a string starting with a dash,
+then it is used for @var{opts}, otherwise the default @option{-gtoggle}
+is used.
+
+@option{-fcompare-debug=}, with the equal sign but without @var{opts},
+is equivalent to @option{-fno-compare-debug}, which disables the dumping
+of the final representation and the second compilation, preventing even
+@env{GCC_COMPARE_DEBUG} from taking effect.
+
+To verify full coverage during @option{-fcompare-debug} testing, set
+@env{GCC_COMPARE_DEBUG} to say @option{-fcompare-debug-not-overridden},
+which GCC rejects as an invalid option in any actual compilation
+(rather than preprocessing, assembly or linking).  To get just a
+warning, setting @env{GCC_COMPARE_DEBUG} to @samp{-w%n-fcompare-debug
+not overridden} will do.
+
+@item -fcompare-debug-second
+@opindex fcompare-debug-second
+This option is implicitly passed to the compiler for the second
+compilation requested by @option{-fcompare-debug}, along with options to
+silence warnings, and omitting other options that would cause
+side-effect compiler outputs to files or to the standard output.  Dump
+files and preserved temporary files are renamed so as to contain the
+@code{.gk} additional extension during the second compilation, to avoid
+overwriting those generated by the first.
+
+When this option is passed to the compiler driver, it causes the
+@emph{first} compilation to be skipped, which makes it useful for little
+other than debugging the compiler proper.
+
+@item -gtoggle
+@opindex gtoggle
+Turn off generation of debug info, if leaving out this option
+generates it, or turn it on at level 2 otherwise.  The position of this
+argument in the command line does not matter; it takes effect after all
+other options are processed, and it does so only once, no matter how
+many times it is given.  This is mainly intended to be used with
+@option{-fcompare-debug}.
+
+@item -fvar-tracking-assignments-toggle
+@opindex fvar-tracking-assignments-toggle
+@opindex fno-var-tracking-assignments-toggle
+Toggle @option{-fvar-tracking-assignments}, in the same way that
+@option{-gtoggle} toggles @option{-g}.
+
+@item -Q
+@opindex Q
+Makes the compiler print out each function name as it is compiled, and
+print some statistics about each pass when it finishes.
+
+@item -ftime-report
+@opindex ftime-report
+Makes the compiler print some statistics about the time consumed by each
+pass when it finishes.
+
+@item -fira-verbose=@var{n}
+@opindex fira-verbose
+Control the verbosity of the dump file for the integrated register allocator.
+The default value is 5.  If the value @var{n} is greater or equal to 10,
+the dump output is sent to stderr using the same format as @var{n} minus 10.
+
+@item -flto-report
+@opindex flto-report
+Prints a report with internal details on the workings of the link-time
+optimizer.  The contents of this report vary from version to version.
+It is meant to be useful to GCC developers when processing object
+files in LTO mode (via @option{-flto}).
+
+Disabled by default.
+
+@item -flto-report-wpa
+@opindex flto-report-wpa
+Like @option{-flto-report}, but only print for the WPA phase of Link
+Time Optimization.
+
+@item -fmem-report
+@opindex fmem-report
+Makes the compiler print some statistics about permanent memory
+allocation when it finishes.
+
+@item -fmem-report-wpa
+@opindex fmem-report-wpa
+Makes the compiler print some statistics about permanent memory
+allocation for the WPA phase only.
+
+@item -fpre-ipa-mem-report
+@opindex fpre-ipa-mem-report
+@item -fpost-ipa-mem-report
+@opindex fpost-ipa-mem-report
+Makes the compiler print some statistics about permanent memory
+allocation before or after interprocedural optimization.
+
+@item -fprofile-report
+@opindex fprofile-report
+Makes the compiler print some statistics about consistency of the
+(estimated) profile and effect of individual passes.
+
+@item -fstack-usage
+@opindex fstack-usage
+Makes the compiler output stack usage information for the program, on a
+per-function basis.  The filename for the dump is made by appending
+@file{.su} to the @var{auxname}.  @var{auxname} is generated from the name of
+the output file, if explicitly specified and it is not an executable,
+otherwise it is the basename of the source file.  An entry is made up
+of three fields:
+
+@itemize
+@item
+The name of the function.
+@item
+A number of bytes.
+@item
+One or more qualifiers: @code{static}, @code{dynamic}, @code{bounded}.
+@end itemize
+
+The qualifier @code{static} means that the function manipulates the stack
+statically: a fixed number of bytes are allocated for the frame on function
+entry and released on function exit; no stack adjustments are otherwise made
+in the function.  The second field is this fixed number of bytes.
+
+The qualifier @code{dynamic} means that the function manipulates the stack
+dynamically: in addition to the static allocation described above, stack
+adjustments are made in the body of the function, for example to push/pop
+arguments around function calls.  If the qualifier @code{bounded} is also
+present, the amount of these adjustments is bounded at compile time and
+the second field is an upper bound of the total amount of stack used by
+the function.  If it is not present, the amount of these adjustments is
+not bounded at compile time and the second field only represents the
+bounded part.
+
+@item -fstats
+@opindex fstats
+Emit statistics about front-end processing at the end of the compilation.
+This option is supported only by the C++ front end, and
+the information is generally only useful to the G++ development team.
+
+@item -fdbg-cnt-list
+@opindex fdbg-cnt-list
+Print the name and the counter upper bound for all debug counters.
+
+
+@item -fdbg-cnt=@var{counter-value-list}
+@opindex fdbg-cnt
+Set the internal debug counter upper bound.  @var{counter-value-list}
+is a comma-separated list of @var{name}:@var{value} pairs
+which sets the upper bound of each debug counter @var{name} to @var{value}.
+All debug counters have the initial upper bound of @code{UINT_MAX};
+thus @code{dbg_cnt} returns true always unless the upper bound
+is set by this option.
+For example, with @option{-fdbg-cnt=dce:10,tail_call:0},
+@code{dbg_cnt(dce)} returns true only for first 10 invocations.
+
+@item -print-file-name=@var{library}
+@opindex print-file-name
+Print the full absolute name of the library file @var{library} that
+would be used when linking---and don't do anything else.  With this
+option, GCC does not compile or link anything; it just prints the
+file name.
+
+@item -print-multi-directory
+@opindex print-multi-directory
+Print the directory name corresponding to the multilib selected by any
+other switches present in the command line.  This directory is supposed
+to exist in @env{GCC_EXEC_PREFIX}.
+
+@item -print-multi-lib
+@opindex print-multi-lib
+Print the mapping from multilib directory names to compiler switches
+that enable them.  The directory name is separated from the switches by
+@samp{;}, and each switch starts with an @samp{@@} instead of the
+@samp{-}, without spaces between multiple switches.  This is supposed to
+ease shell processing.
+
+@item -print-multi-os-directory
+@opindex print-multi-os-directory
+Print the path to OS libraries for the selected
+multilib, relative to some @file{lib} subdirectory.  If OS libraries are
+present in the @file{lib} subdirectory and no multilibs are used, this is
+usually just @file{.}, if OS libraries are present in @file{lib@var{suffix}}
+sibling directories this prints e.g.@: @file{../lib64}, @file{../lib} or
+@file{../lib32}, or if OS libraries are present in @file{lib/@var{subdir}}
+subdirectories it prints e.g.@: @file{amd64}, @file{sparcv9} or @file{ev6}.
+
+@item -print-multiarch
+@opindex print-multiarch
+Print the path to OS libraries for the selected multiarch,
+relative to some @file{lib} subdirectory.
+
+@item -print-prog-name=@var{program}
+@opindex print-prog-name
+Like @option{-print-file-name}, but searches for a program such as @command{cpp}.
+
+@item -print-libgcc-file-name
+@opindex print-libgcc-file-name
+Same as @option{-print-file-name=libgcc.a}.
+
+This is useful when you use @option{-nostdlib} or @option{-nodefaultlibs}
+but you do want to link with @file{libgcc.a}.  You can do:
+
+@smallexample
+gcc -nostdlib @var{files}@dots{} `gcc -print-libgcc-file-name`
+@end smallexample
+
+@item -print-search-dirs
+@opindex print-search-dirs
+Print the name of the configured installation directory and a list of
+program and library directories @command{gcc} searches---and don't do anything else.
+
+This is useful when @command{gcc} prints the error message
+@samp{installation problem, cannot exec cpp0: No such file or directory}.
+To resolve this you either need to put @file{cpp0} and the other compiler
+components where @command{gcc} expects to find them, or you can set the environment
+variable @env{GCC_EXEC_PREFIX} to the directory where you installed them.
+Don't forget the trailing @samp{/}.
+@xref{Environment Variables}.
+
+@item -print-sysroot
+@opindex print-sysroot
+Print the target sysroot directory that is used during
+compilation.  This is the target sysroot specified either at configure
+time or using the @option{--sysroot} option, possibly with an extra
+suffix that depends on compilation options.  If no target sysroot is
+specified, the option prints nothing.
+
+@item -print-sysroot-headers-suffix
+@opindex print-sysroot-headers-suffix
+Print the suffix added to the target sysroot when searching for
+headers, or give an error if the compiler is not configured with such
+a suffix---and don't do anything else.
+
+@item -dumpmachine
+@opindex dumpmachine
+Print the compiler's target machine (for example,
+@samp{i686-pc-linux-gnu})---and don't do anything else.
+
+@item -dumpversion
+@opindex dumpversion
+Print the compiler version (for example, @code{3.0})---and don't do
+anything else.
+
+@item -dumpspecs
+@opindex dumpspecs
+Print the compiler's built-in specs---and don't do anything else.  (This
+is used when GCC itself is being built.)  @xref{Spec Files}.
+@end table
+
 @node Submodel Options
 @section Machine-Dependent Options
 @cindex submodel options