; Options for the language- and target-independent parts of the compiler.
; Copyright (C) 2003-2015 Free Software Foundation, Inc.
;
; This file is part of GCC.
;
; GCC is free software; you can redistribute it and/or modify it under
; the terms of the GNU General Public License as published by the Free
; Software Foundation; either version 3, or (at your option) any later
; version.
;
; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
; WARRANTY; without even the implied warranty of MERCHANTABILITY or
; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
; for more details.
;
; You should have received a copy of the GNU General Public License
; along with GCC; see the file COPYING3. If not see
; .
; See the GCC internals manual (options.texi) for a description of this file's format.
; Please try to keep this file in ASCII collating order.
Variable
int target_flags
Variable
int optimize
Variable
int optimize_size
Variable
int optimize_debug
; Not used directly to control optimizations, only to save -Ofast
; setting for "optimize" attributes.
Variable
int optimize_fast
; True if this is the lto front end. This is used to disable gimple
; generation and lowering passes that are normally run on the output
; of a front end. These passes must be bypassed for lto since they
; have already been done before the gimple was written.
Variable
bool in_lto_p = false
; Enable additional checks of internal state consistency, which may slow
; the compiler down.
Variable
bool flag_checking = CHECKING_P
; 0 means straightforward implementation of complex divide acceptable.
; 1 means wide ranges of inputs must work for complex divide.
; 2 means C99-like requirements for complex multiply and divide.
Variable
int flag_complex_method = 1
; Nonzero if subexpressions must be evaluated from left-to-right.
Variable
int flag_evaluation_order = 0
; Language specific warning pass for unused results.
Variable
bool flag_warn_unused_result = false
Variable
int *param_values
; Nonzero if we should write GIMPLE bytecode for link-time optimization.
Variable
int flag_generate_lto
; Nonzero if we should write GIMPLE bytecode for offload compilation.
Variable
int flag_generate_offload = 0
; True to warn about any objects definitions whose size is larger
; than N bytes. Also want about function definitions whose returned
; values are larger than N bytes, where N is 'larger_than_size'.
Variable
bool warn_larger_than
Variable
HOST_WIDE_INT larger_than_size
; True to warn about any function whose frame size is larger
; than N bytes.
Variable
bool warn_frame_larger_than
Variable
HOST_WIDE_INT frame_larger_than_size
; Nonzero means we should be saving declaration info into a .X file.
Variable
int flag_gen_aux_info = 0
; Nonzero if we are compiling code for a shared library, zero for
; executable.
Variable
int flag_shlib
; These two are really VEC(char_p,heap) *.
Variable
void *flag_instrument_functions_exclude_functions
Variable
void *flag_instrument_functions_exclude_files
; Generic structs (e.g. templates not explicitly specialized)
; may not have a compilation unit associated with them, and so
; may need to be treated differently from ordinary structs.
;
; Structs only handled by reference (indirectly), will also usually
; not need as much debugging information.
Variable
enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
Variable
enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
; True if we should exit after parsing options.
Variable
bool exit_after_options
; Type(s) of debugging information we are producing (if any). See
; flag-types.h for the definitions of the different possible types of
; debugging information.
Variable
enum debug_info_type write_symbols = NO_DEBUG
; Level of debugging information we are producing. See flag-types.h
; for the definitions of the different possible levels.
Variable
enum debug_info_levels debug_info_level = DINFO_LEVEL_NONE
; Nonzero means use GNU-only extensions in the generated symbolic
; debugging information. Currently, this only has an effect when
; write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG.
Variable
bool use_gnu_debug_info_extensions
; Original value of maximum field alignment in bytes, specified via
; -fpack-struct=.
Variable
unsigned int initial_max_fld_align = TARGET_DEFAULT_PACK_STRUCT
; Type of stack check.
Variable
enum stack_check_type flag_stack_check = NO_STACK_CHECK
; True if stack usage information needs to be computed.
Variable
bool flag_stack_usage_info = false
; -dA causes debug commentary information to be produced in
; the generated assembly code (to make it more readable). This option
; is generally only of use to those who actually need to read the
; generated assembly code (perhaps while debugging the compiler itself).
; Currently, this switch is only used by dwarf2out.c; however, it is intended
; to be a catchall for printing debug information in the assembler file.
Variable
int flag_debug_asm
; -dP causes the rtl to be emitted as a comment in assembly.
Variable
int flag_dump_rtl_in_asm
; Whether -da was passed (used only in handle_common_deferred_options).
Variable
bool flag_dump_all_passed
; Other flags saying which kinds of debugging dump have been requested.
Variable
int rtl_dump_and_exit
Variable
int flag_print_asm_name
; Name of top-level original source file (what was input to cpp).
; This comes from the #-command at the beginning of the actual input.
; If there isn't any there, then this is the cc1 input file name.
Variable
const char *main_input_filename
; Pointer to base name in main_input_filename, with directories and a
; single final extension removed, and the length of this base
; name.
Variable
const char *main_input_basename
Variable
int main_input_baselength
; Which options have been printed by --help.
Variable
char *help_printed
; Which enums have been printed by --help. 0 = not printed, no
; relevant options seen, 1 = relevant option seen, not yet printed, 2
; = printed.
Variable
char *help_enum_printed
; The number of columns for --help output.
Variable
unsigned int help_columns
; Whether this options structure has been through finish_options
Variable
bool flag_opts_finished
; What the sanitizer should instrument
Variable
unsigned int flag_sanitize
; What sanitizers should recover from errors
Variable
unsigned int flag_sanitize_recover = SANITIZE_UNDEFINED | SANITIZE_NONDEFAULT | SANITIZE_KERNEL_ADDRESS
; Flag whether a prefix has been added to dump_base_name
Variable
bool dump_base_name_prefixed = false
###
Driver
-assemble
Driver Alias(S)
-compile
Driver Alias(c)
-coverage
Driver Alias(coverage)
-debug
Common Alias(g)
-dump
Common Separate Alias(d)
-dump=
Common Joined Alias(d)
-dumpbase
Common Separate Alias(dumpbase)
-dumpdir
Common Separate Alias(dumpdir)
-entry
Driver Separate Alias(e)
-entry=
Driver Joined Alias(e)
-extra-warnings
Common Warning Alias(Wextra)
-for-assembler
Driver Separate Alias(Xassembler)
-for-assembler=
Driver JoinedOrMissing Alias(Xassembler)
-for-linker
Driver Separate Alias(Xlinker)
-for-linker=
Driver JoinedOrMissing Alias(Xlinker)
-force-link
Driver Separate Alias(u)
-force-link=
Driver Joined Alias(u)
-help
Common Driver Var(help_flag)
Display this information
-help=
Common Driver Report Joined
--help= Display descriptions of a specific class of options. is one or more of optimizers, target, warnings, undocumented, params
-language
Driver Separate Alias(x)
-language=
Driver Joined Alias(x)
-library-directory
Driver Separate Alias(L)
-library-directory=
Driver Joined Alias(L)
-no-canonical-prefixes
Driver Alias(no-canonical-prefixes)
-no-standard-libraries
Driver Alias(nostdlib)
-no-sysroot-suffix
Driver Var(no_sysroot_suffix)
-no-warnings
Common Alias(w)
-optimize
Common Alias(O)
-output
Common Driver Separate Alias(o) MissingArgError(missing filename after %qs)
-output=
Common Driver Joined Alias(o) MissingArgError(missing filename after %qs)
-pass-exit-codes
Driver Alias(pass-exit-codes)
-pedantic
Common Alias(Wpedantic)
-pedantic-errors
Common Alias(pedantic-errors)
-pie
Driver Alias(pie)
-pipe
Driver Alias(pipe)
-prefix
Driver Separate Alias(B)
-prefix=
Driver JoinedOrMissing Alias(B)
-preprocess
Driver Alias(E)
-print-file-name
Driver Separate Alias(print-file-name=)
-print-file-name=
Driver JoinedOrMissing Alias(print-file-name=)
-print-libgcc-file-name
Driver Alias(print-libgcc-file-name)
-print-multi-directory
Driver Alias(print-multi-directory)
-print-multi-lib
Driver Alias(print-multi-lib)
-print-multi-os-directory
Driver Alias(print-multi-os-directory)
-print-multiarch
Driver Alias(print-multiarch)
-print-prog-name
Driver Separate Alias(print-prog-name=)
-print-prog-name=
Driver JoinedOrMissing Alias(print-prog-name=)
-print-search-dirs
Driver Alias(print-search-dirs)
-print-sysroot
Driver Alias(print-sysroot)
-print-sysroot-headers-suffix
Driver Alias(print-sysroot-headers-suffix)
-profile
Common Alias(p)
-save-temps
Driver Alias(save-temps)
-shared
Driver Alias(shared)
-specs
Driver Separate Alias(specs=)
-specs=
Driver Joined Alias(specs=)
-static
Driver Alias(static)
-symbolic
Driver Alias(symbolic)
-target-help
Common Driver
Alias for --help=target
-time
Driver Alias(time)
-verbose
Driver Alias(v)
;; The driver used to convert options such as --help into forms such
;; as -fhelp; the following four entries are for compatibility with
;; any direct uses of those (undocumented) -f forms
fhelp
Common Driver Alias(-help)
fhelp=
Common Driver Joined Alias(-help=)
ftarget-help
Common Driver Alias(-target-help)
fversion
Common Driver Alias(-version)
-param
Common Separate
--param = Set parameter to value. See below for a complete list of parameters
-param=
Common Joined Alias(-param)
-sysroot
Driver Separate Alias(-sysroot=)
-sysroot=
Driver JoinedOrMissing
-version
Common Driver
B
Driver Joined Separate
E
Driver
L
Driver Joined Separate
N
Driver
O
Common JoinedOrMissing Optimization
-O Set optimization level to
Os
Common Optimization
Optimize for space rather than speed
Ofast
Common Optimization
Optimize for speed disregarding exact standards compliance
Og
Common Optimization
Optimize for debugging experience rather than speed or size
Q
Driver
Qn
Driver Negative(Qy)
Qy
Driver Negative(Qn)
R
Driver Joined Separate
S
Driver
T
Driver Joined Separate
Tbss
Driver Separate
Tbss=
Driver Joined
Tdata
Driver Separate
Tdata=
Driver Joined
Ttext
Driver Separate
Ttext=
Driver Joined
W
Common RejectNegative Warning Alias(Wextra)
This switch is deprecated; use -Wextra instead
Wa,
Driver JoinedOrMissing
Wl,
Driver JoinedOrMissing
Wp,
Driver JoinedOrMissing
Waggregate-return
Common Var(warn_aggregate_return) Warning
Warn about returning structures, unions or arrays
Waggressive-loop-optimizations
Common Var(warn_aggressive_loop_optimizations) Init(1) Warning
Warn if a loop with constant number of iterations triggers undefined behavior
Warray-bounds
Common Var(warn_array_bounds) Warning
Warn if an array is accessed out of bounds
Warray-bounds=
Common Joined RejectNegative UInteger Var(warn_array_bounds) Warning
Warn if an array is accessed out of bounds
Wattributes
Common Var(warn_attributes) Init(1) Warning
Warn about inappropriate attribute usage
Wcast-align
Common Var(warn_cast_align) Warning
Warn about pointer casts which increase alignment
Wcpp
Common Var(warn_cpp) Init(1) Warning
Warn when a #warning directive is encountered
Wdeprecated-declarations
Common Var(warn_deprecated_decl) Init(1) Warning
Warn about uses of __attribute__((deprecated)) declarations
Wdisabled-optimization
Common Var(warn_disabled_optimization) Warning
Warn when an optimization pass is disabled
Werror
Common Var(warnings_are_errors)
Treat all warnings as errors
Werror=
Common Joined
Treat specified warning as error
Wextra
Common Var(extra_warnings) Warning
Print extra (possibly unwanted) warnings
Wfatal-errors
Common Var(flag_fatal_errors)
Exit on the first error occurred
Wframe-larger-than=
Common RejectNegative Joined UInteger
-Wframe-larger-than= Warn if a function's stack frame requires more than bytes
Wfree-nonheap-object
Common Var(warn_free_nonheap_object) Init(1) Warning
Warn when attempting to free a non-heap object
Winline
Common Var(warn_inline) Warning
Warn when an inlined function cannot be inlined
Winvalid-memory-model
Common Var(warn_invalid_memory_model) Init(1) Warning
Warn when an atomic memory model parameter is known to be outside the valid range.
Wlarger-than-
Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=)
Wlarger-than=
Common RejectNegative Joined UInteger Warning
-Wlarger-than= Warn if an object is larger than bytes
Wnull-dereference
Common Var(warn_null_dereference) Warning
Warn if dereferencing a NULL pointer may lead to erroneous or undefined behavior
Wunsafe-loop-optimizations
Common Var(warn_unsafe_loop_optimizations) Warning
Warn if the loop cannot be optimized due to nontrivial assumptions.
Wmissing-noreturn
Common Alias(Wsuggest-attribute=noreturn)
Wodr
Common Var(warn_odr_violations) Init(1) Warning
Warn about some C++ One Definition Rule violations during link time optimization
Woverflow
Common Var(warn_overflow) Init(1) Warning
Warn about overflow in arithmetic expressions
Wlto-type-mismatch
Common Var(warn_lto_type_mismatch) Init(1) Warning
During link time optimization warn about mismatched types of global declarations
Wpacked
Common Var(warn_packed) Warning
Warn when the packed attribute has no effect on struct layout
Wpadded
Common Var(warn_padded) Warning
Warn when padding is required to align structure members
Wpedantic
Common Var(pedantic) Init(0) Warning
Issue warnings needed for strict compliance to the standard
Wreturn-local-addr
Common Var(warn_return_local_addr) Init(1) Warning
Warn about returning a pointer/reference to a local or temporary variable.
Wshadow
Common Var(warn_shadow) Warning
Warn when one local variable shadows another
Wstack-protector
Common Var(warn_stack_protect) Warning
Warn when not issuing stack smashing protection for some reason
Wstack-usage=
Common Joined RejectNegative UInteger Var(warn_stack_usage) Init(-1) Warning
Warn if stack usage might be larger than specified amount
Wstrict-aliasing
Common Warning
Warn about code which might break strict aliasing rules
Wstrict-aliasing=
Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Warning
Warn about code which might break strict aliasing rules
Wstrict-overflow
Common Warning
Warn about optimizations that assume that signed overflow is undefined
Wstrict-overflow=
Common Joined RejectNegative UInteger Var(warn_strict_overflow) Warning
Warn about optimizations that assume that signed overflow is undefined
Wsuggest-attribute=const
Common Var(warn_suggest_attribute_const) Warning
Warn about functions which might be candidates for __attribute__((const))
Wsuggest-attribute=pure
Common Var(warn_suggest_attribute_pure) Warning
Warn about functions which might be candidates for __attribute__((pure))
Wsuggest-attribute=noreturn
Common Var(warn_suggest_attribute_noreturn) Warning
Warn about functions which might be candidates for __attribute__((noreturn))
Wsuggest-final-types
Common Var(warn_suggest_final_types) Warning
Warn about C++ polymorphic types where adding final keyword would improve code quality
Wsuggest-final-methods
Common Var(warn_suggest_final_methods) Warning
Warn about C++ virtual methods where adding final keyword would improve code quality
Wsystem-headers
Common Var(warn_system_headers) Warning
Do not suppress warnings from system headers
Wtrampolines
Common Var(warn_trampolines) Warning
Warn whenever a trampoline is generated
Wtype-limits
Common Var(warn_type_limits) Warning EnabledBy(Wextra)
Warn if a comparison is always true or always false due to the limited range of the data type
Wuninitialized
Common Var(warn_uninitialized) Warning EnabledBy(Wextra)
Warn about uninitialized automatic variables
Wmaybe-uninitialized
Common Var(warn_maybe_uninitialized) Warning EnabledBy(Wuninitialized)
Warn about maybe uninitialized automatic variables
Wunreachable-code
Common Ignore
Does nothing. Preserved for backward compatibility.
Wunused
Common Var(warn_unused) Init(0) Warning
Enable all -Wunused- warnings
Wunused-but-set-parameter
Common Var(warn_unused_but_set_parameter) Warning EnabledBy(Wunused && Wextra)
Warn when a function parameter is only set, otherwise unused
Wunused-but-set-variable
Common Var(warn_unused_but_set_variable) Warning EnabledBy(Wunused)
Warn when a variable is only set, otherwise unused
Wunused-function
Common Var(warn_unused_function) Warning EnabledBy(Wunused)
Warn when a function is unused
Wunused-label
Common Var(warn_unused_label) Warning EnabledBy(Wunused)
Warn when a label is unused
Wunused-parameter
Common Var(warn_unused_parameter) Warning EnabledBy(Wunused && Wextra)
Warn when a function parameter is unused
Wunused-value
Common Var(warn_unused_value) Warning EnabledBy(Wunused)
Warn when an expression value is unused
Wunused-variable
Common Var(warn_unused_variable) Warning EnabledBy(Wunused)
Warn when a variable is unused
Wcoverage-mismatch
Common Var(warn_coverage_mismatch) Init(1) Warning
Warn in case profiles in -fprofile-use do not match
Wvector-operation-performance
Common Var(warn_vector_operation_performance) Warning
Warn when a vector operation is compiled outside the SIMD
Xassembler
Driver Separate
Xlinker
Driver Separate
Xpreprocessor
Driver Separate
Z
Driver
aux-info
Common Separate Var(aux_info_file_name)
-aux-info Emit declaration information into
aux-info=
Common Joined Alias(aux-info)
auxbase
Common Separate RejectDriver Var(aux_base_name)
auxbase-strip
Common Separate RejectDriver
coverage
Driver
c
Driver
d
Common Joined
-d Enable dumps from specific passes of the compiler
dumpbase
Common Separate Var(dump_base_name)
-dumpbase Set the file basename to be used for dumps
dumpdir
Common Separate Var(dump_dir_name)
-dumpdir Set the directory name to be used for dumps
dumpmachine
Driver
dumpspecs
Driver
dumpversion
Driver
e
Driver Joined Separate
; This option has historically been passed down to the linker by an
; accident of a %{e*} spec, so ensure it continues to be passed down
; as a single option. The supported option for this purpose is
; -rdynamic. See PR 47390.
export-dynamic
Driver Undocumented
; The version of the C++ ABI in use. The following values are allowed:
;
; 0: The version of the ABI believed most conformant with the C++ ABI
; specification. This ABI may change as bugs are discovered and fixed.
; Therefore, 0 will not necessarily indicate the same ABI in different
; versions of G++.
;
; 1: The version of the ABI first used in G++ 3.2. No longer selectable.
;
; 2: The version of the ABI first used in G++ 3.4, and the default
; until GCC 4.9.
;
; 3: The version of the ABI that fixes the missing underscore
; in template non-type arguments of pointer type.
;
; 4: The version of the ABI that introduces unambiguous mangling of
; vector types. First selectable in G++ 4.5.
;
; 5: The version of the ABI that ignores attribute const/noreturn
; in function pointer mangling, and corrects mangling of decltype and
; function parameters used in other parameters and the return type.
; First selectable in G++ 4.6.
;
; 6: The version of the ABI that doesn't promote scoped enums to int and
; changes the mangling of template argument packs, const/static_cast,
; prefix ++ and --, and a class scope function used as a template
; argument.
; First selectable in G++ 4.7.
;
; 7: The version of the ABI that treats nullptr_t as a builtin type and
; corrects the mangling of lambdas in default argument scope.
; First selectable in G++ 4.8.
;
; 8: The version of the ABI that corrects the substitution behavior of
; function types with function-cv-qualifiers.
; First selectable in G++ 4.9 and default in G++ 5.
;
; 9: The version of the ABI that corrects the alignment of nullptr_t.
; First selectable and default in G++ 5.2.
;
; 10: The version of the ABI that mangles attributes that affect type
; identity, such as ia32 calling convention attributes (stdcall, etc.)
; Default in G++ 6 (set in c_common_post_options).
;
; Additional positive integers will be assigned as new versions of
; the ABI become the default version of the ABI.
fabi-version=
Common Joined RejectNegative UInteger Var(flag_abi_version) Init(0)
The version of the C++ ABI in use
faggressive-loop-optimizations
Common Report Var(flag_aggressive_loop_optimizations) Optimization Init(1)
Aggressively optimize loops using language constraints
falign-functions
Common Report Var(align_functions,0) Optimization UInteger
Align the start of functions
falign-functions=
Common RejectNegative Joined UInteger Var(align_functions)
falign-jumps
Common Report Var(align_jumps,0) Optimization UInteger
Align labels which are only reached by jumping
falign-jumps=
Common RejectNegative Joined UInteger Var(align_jumps)
falign-labels
Common Report Var(align_labels,0) Optimization UInteger
Align all labels
falign-labels=
Common RejectNegative Joined UInteger Var(align_labels)
falign-loops
Common Report Var(align_loops,0) Optimization UInteger
Align the start of loops
falign-loops=
Common RejectNegative Joined UInteger Var(align_loops)
fargument-alias
Common Ignore
Does nothing. Preserved for backward compatibility.
fargument-noalias
Common Ignore
Does nothing. Preserved for backward compatibility.
fargument-noalias-global
Common Ignore
Does nothing. Preserved for backward compatibility.
fargument-noalias-anything
Common Ignore
Does nothing. Preserved for backward compatibility.
fsanitize=
Common Driver Report Joined
Select what to sanitize
fasan-shadow-offset=
Common Joined RejectNegative Var(common_deferred_options) Defer
-fasan-shadow-offset= Use custom shadow memory offset.
fsanitize-sections=
Common Joined RejectNegative Var(common_deferred_options) Defer
-fsanitize-sections= Sanitize global variables
in user-defined sections.
fsanitize-recover=
Common Report Joined
After diagnosing undefined behavior attempt to continue execution
fsanitize-recover
Common Report
This switch is deprecated; use -fsanitize-recover= instead
fsanitize-undefined-trap-on-error
Common Driver Report Var(flag_sanitize_undefined_trap_on_error) Init(0)
Use trap instead of a library function for undefined behavior sanitization
fasynchronous-unwind-tables
Common Report Var(flag_asynchronous_unwind_tables) Optimization
Generate unwind tables that are exact at each instruction boundary
fauto-inc-dec
Common Report Var(flag_auto_inc_dec) Init(1) Optimization
Generate auto-inc/dec instructions
fauto-profile
Common Report Var(flag_auto_profile)
Use sample profile information for call graph node weights. The default
profile file is fbdata.afdo in 'pwd'.
fauto-profile=
Common Joined RejectNegative Var(auto_profile_file)
Use sample profile information for call graph node weights. The profile
file is specified in the argument.
; -fcheck-bounds causes gcc to generate array bounds checks.
; For C, C++ and ObjC: defaults off.
; For Java: defaults to on.
; For Fortran: defaults to off.
fbounds-check
Common Report Var(flag_bounds_check)
Generate code to check bounds before indexing arrays
fbranch-count-reg
Common Report Var(flag_branch_on_count_reg) Optimization
Replace add, compare, branch with branch on count register
fbranch-probabilities
Common Report Var(flag_branch_probabilities) Optimization
Use profiling information for branch probabilities
fbranch-target-load-optimize
Common Report Var(flag_branch_target_load_optimize) Optimization
Perform branch target load optimization before prologue / epilogue threading
fbranch-target-load-optimize2
Common Report Var(flag_branch_target_load_optimize2) Optimization
Perform branch target load optimization after prologue / epilogue threading
fbtr-bb-exclusive
Common Report Var(flag_btr_bb_exclusive) Optimization
Restrict target load migration not to re-use registers in any basic block
fcall-saved-
Common Joined RejectNegative Var(common_deferred_options) Defer
-fcall-saved- Mark as being preserved across functions
fcall-used-
Common Joined RejectNegative Var(common_deferred_options) Defer
-fcall-used- Mark as being corrupted by function calls
; Nonzero for -fcaller-saves: allocate values in regs that need to
; be saved across function calls, if that produces overall better code.
; Optional now, so people can test it.
fcaller-saves
Common Report Var(flag_caller_saves) Optimization
Save registers around function calls
fcheck-data-deps
Common Report Var(flag_check_data_deps)
This switch is deprecated; do not use.
fcheck-new
Common Var(flag_check_new)
Check the return value of new in C++
fcombine-stack-adjustments
Common Report Var(flag_combine_stack_adjustments) Optimization
Looks for opportunities to reduce stack adjustments and stack references.
fcommon
Common Report Var(flag_no_common,0)
Do not put uninitialized globals in the common section
fcompare-debug
Driver
; Converted by the driver to -fcompare-debug= options.
fcompare-debug=
Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
-fcompare-debug[=] Compile with and without e.g. -gtoggle, and compare the final-insns dump
fcompare-debug-second
Common Driver RejectNegative Var(flag_compare_debug)
Run only the second compilation of -fcompare-debug
fcompare-elim
Common Report Var(flag_compare_elim_after_reload) Optimization
Perform comparison elimination after register allocation has finished
fconserve-stack
Common Var(flag_conserve_stack) Optimization
Do not perform optimizations increasing noticeably stack usage
fcprop-registers
Common Report Var(flag_cprop_registers) Optimization
Perform a register copy-propagation optimization pass
fcrossjumping
Common Report Var(flag_crossjumping) Optimization
Perform cross-jumping optimization
fcse-follow-jumps
Common Report Var(flag_cse_follow_jumps) Optimization
When running CSE, follow jumps to their targets
fcse-skip-blocks
Common Ignore
Does nothing. Preserved for backward compatibility.
fcx-limited-range
Common Report Var(flag_cx_limited_range) Optimization SetByCombined
Omit range reduction step when performing complex division
fcx-fortran-rules
Common Report Var(flag_cx_fortran_rules) Optimization
Complex multiplication and division follow Fortran rules
fdata-sections
Common Report Var(flag_data_sections)
Place data items into their own section
fdbg-cnt-list
Common Report Var(common_deferred_options) Defer
List all available debugging counters with their limits and counts.
fdbg-cnt=
Common RejectNegative Joined Var(common_deferred_options) Defer
-fdbg-cnt=:[,:,...] Set the debug counter limit.
fdebug-prefix-map=
Common Joined RejectNegative Var(common_deferred_options) Defer
Map one directory name to another in debug information
fdebug-types-section
Common Report Var(flag_debug_types_section) Init(0)
Output .debug_types section when using DWARF v4 debuginfo.
; Nonzero for -fdefer-pop: don't pop args after each function call
; instead save them up to pop many calls' args with one insns.
fdefer-pop
Common Report Var(flag_defer_pop) Optimization
Defer popping functions args from stack until later
fdelayed-branch
Common Report Var(flag_delayed_branch) Optimization
Attempt to fill delay slots of branch instructions
fdelete-dead-exceptions
Common Report Var(flag_delete_dead_exceptions) Init(0) Optimization
Delete dead instructions that may throw exceptions
fdelete-null-pointer-checks
Common Report Var(flag_delete_null_pointer_checks) Init(-1) Optimization
Delete useless null pointer checks
fdevirtualize-at-ltrans
Common Report Var(flag_ltrans_devirtualize)
Stream extra data to support more aggressive devirtualization in LTO local transformation mode
fdevirtualize-speculatively
Common Report Var(flag_devirtualize_speculatively) Optimization
Perform speculative devirtualization
fdevirtualize
Common Report Var(flag_devirtualize) Optimization
Try to convert virtual calls to direct ones.
fdiagnostics-show-location=
Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
-fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
; Required for these enum values.
SourceInclude
pretty-print.h
Enum
Name(diagnostic_prefixing_rule) Type(int)
EnumValue
Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE)
EnumValue
Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
fdiagnostics-show-caret
Common Var(flag_diagnostics_show_caret) Init(1)
Show the source line with a caret indicating the column
fdiagnostics-color
Common Alias(fdiagnostics-color=,always,never)
;
fdiagnostics-color=
Driver Common Joined RejectNegative Var(flag_diagnostics_show_color) Enum(diagnostic_color_rule) Init(DIAGNOSTICS_COLOR_NO)
-fdiagnostics-color=[never|always|auto] Colorize diagnostics
; Required for these enum values.
SourceInclude
diagnostic-color.h
Enum
Name(diagnostic_color_rule) Type(int)
EnumValue
Enum(diagnostic_color_rule) String(never) Value(DIAGNOSTICS_COLOR_NO)
EnumValue
Enum(diagnostic_color_rule) String(always) Value(DIAGNOSTICS_COLOR_YES)
EnumValue
Enum(diagnostic_color_rule) String(auto) Value(DIAGNOSTICS_COLOR_AUTO)
fdiagnostics-show-option
Common Var(flag_diagnostics_show_option) Init(1)
Amend appropriate diagnostic messages with the command line option that controls them
fdisable-
Common Joined RejectNegative Var(common_deferred_options) Defer
-fdisable-[tree|rtl|ipa]-=range1+range2 disables an optimization pass
fenable-
Common Joined RejectNegative Var(common_deferred_options) Defer
-fenable-[tree|rtl|ipa]-=range1+range2 enables an optimization pass
fdump-
Common Joined RejectNegative Var(common_deferred_options) Defer
-fdump- Dump various compiler internals to a file
fdump-final-insns
Driver RejectNegative
fdump-final-insns=
Common RejectNegative Joined Var(flag_dump_final_insns)
-fdump-final-insns=filename Dump to filename the insns at the end of translation
fdump-go-spec=
Common RejectNegative Joined Var(flag_dump_go_spec)
-fdump-go-spec=filename Write all declarations to file as Go code
fdump-noaddr
Common Report Var(flag_dump_noaddr)
Suppress output of addresses in debugging dumps
freport-bug
Common Driver Var(flag_report_bug)
Collect and dump debug information into temporary file if ICE in C/C++
compiler occured.
fdump-internal-locations
Common Var(flag_dump_locations) Init(0)
Dump detailed information on GCC's internal representation of source code locations
fdump-passes
Common Var(flag_dump_passes) Init(0)
Dump optimization passes
fdump-unnumbered
Common Report Var(flag_dump_unnumbered)
Suppress output of instruction numbers, line number notes and addresses in debugging dumps
fdump-unnumbered-links
Common Report Var(flag_dump_unnumbered_links)
Suppress output of previous and next insn numbers in debugging dumps
fdwarf2-cfi-asm
Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
Enable CFI tables via GAS assembler directives.
fearly-inlining
Common Report Var(flag_early_inlining) Init(1) Optimization
Perform early inlining
feliminate-dwarf2-dups
Common Report Var(flag_eliminate_dwarf2_dups)
Perform DWARF2 duplicate elimination
fipa-sra
Common Report Var(flag_ipa_sra) Init(0) Optimization
Perform interprocedural reduction of aggregates
feliminate-unused-debug-symbols
Common Report Var(flag_debug_only_used_symbols)
Perform unused symbol elimination in debug info
feliminate-unused-debug-types
Common Report Var(flag_eliminate_unused_debug_types) Init(1)
Perform unused type elimination in debug info
femit-class-debug-always
Common Report Var(flag_emit_class_debug_always) Init(0)
Do not suppress C++ class debug information.
fexceptions
Common Report Var(flag_exceptions) Optimization
Enable exception handling
fexpensive-optimizations
Common Report Var(flag_expensive_optimizations) Optimization
Perform a number of minor, expensive optimizations
fexcess-precision=
Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT)
-fexcess-precision=[fast|standard] Specify handling of excess floating-point precision
Enum
Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
EnumValue
Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST)
EnumValue
Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
ffast-math
Common
ffat-lto-objects
Common Var(flag_fat_lto_objects)
Output lto objects containing both the intermediate language and binary output.
ffinite-math-only
Common Report Var(flag_finite_math_only) Optimization SetByCombined
Assume no NaNs or infinities are generated
ffixed-
Common Joined RejectNegative Var(common_deferred_options) Defer
-ffixed- Mark as being unavailable to the compiler
ffloat-store
Common Report Var(flag_float_store) Optimization
Don't allocate floats and doubles in extended-precision registers
fforce-addr
Common Ignore
Does nothing. Preserved for backward compatibility.
fforward-propagate
Common Report Var(flag_forward_propagate) Optimization
Perform a forward propagation pass on RTL
ffp-contract=
Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST) Optimization
-ffp-contract=[off|on|fast] Perform floating-point expression contraction.
Enum
Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs)
EnumValue
Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF)
; Not implemented, fall back to conservative FP_CONTRACT_OFF.
EnumValue
Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF)
EnumValue
Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
; Nonzero means don't put addresses of constant functions in registers.
; Used for compiling the Unix kernel, where strange substitutions are
; done on the assembly output.
ffunction-cse
Common Report Var(flag_no_function_cse,0) Optimization
Allow function addresses to be held in registers
ffunction-sections
Common Report Var(flag_function_sections)
Place each function into its own section
fgcse
Common Report Var(flag_gcse) Optimization
Perform global common subexpression elimination
fgcse-lm
Common Report Var(flag_gcse_lm) Init(1) Optimization
Perform enhanced load motion during global common subexpression elimination
fgcse-sm
Common Report Var(flag_gcse_sm) Init(0) Optimization
Perform store motion after global common subexpression elimination
fgcse-las
Common Report Var(flag_gcse_las) Init(0) Optimization
Perform redundant load after store elimination in global common subexpression
elimination
fgcse-after-reload
Common Report Var(flag_gcse_after_reload) Optimization
Perform global common subexpression elimination after register allocation
has finished
; This option is not documented yet as its semantics will change.
fgraphite
Common Report Var(flag_graphite) Optimization
Enable in and out of Graphite representation
fgraphite-identity
Common Report Var(flag_graphite_identity) Optimization
Enable Graphite Identity transformation
fhoist-adjacent-loads
Common Report Var(flag_hoist_adjacent_loads) Optimization
Enable hoisting adjacent loads to encourage generating conditional move
instructions
floop-parallelize-all
Common Report Var(flag_loop_parallelize_all) Optimization
Mark all loops as parallel
floop-strip-mine
Common Alias(floop-nest-optimize)
Enable loop nest transforms. Same as -floop-nest-optimize
floop-interchange
Common Alias(floop-nest-optimize)
Enable loop nest transforms. Same as -floop-nest-optimize
floop-block
Common Alias(floop-nest-optimize)
Enable loop nest transforms. Same as -floop-nest-optimize
floop-unroll-and-jam
Common Alias(floop-nest-optimize)
Enable loop nest transforms. Same as -floop-nest-optimize
fgnu-tm
Common Report Var(flag_tm)
Enable support for GNU transactional memory
fgnu-unique
Common Report Var(flag_gnu_unique) Init(1)
Use STB_GNU_UNIQUE if supported by the assembler
floop-flatten
Common Ignore
Does nothing. Preserved for backward compatibility.
floop-nest-optimize
Common Report Var(flag_loop_optimize_isl) Optimization
Enable the ISL based loop nest optimizer
fstrict-volatile-bitfields
Common Report Var(flag_strict_volatile_bitfields) Init(-1) Optimization
Force bitfield accesses to match their type width
fguess-branch-probability
Common Report Var(flag_guess_branch_prob) Optimization
Enable guessing of branch probabilities
; Nonzero means ignore `#ident' directives. 0 means handle them.
; Generate position-independent code for executables if possible
; On SVR4 targets, it also controls whether or not to emit a
; string identifying the compiler.
fident
Common Report Var(flag_no_ident,0)
Process #ident directives
fif-conversion
Common Report Var(flag_if_conversion) Optimization
Perform conversion of conditional jumps to branchless equivalents
fif-conversion2
Common Report Var(flag_if_conversion2) Optimization
Perform conversion of conditional jumps to conditional execution
fstack-reuse=
Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL) Optimization
-fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables.
Enum
Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
EnumValue
Enum(stack_reuse_level) String(all) Value(SR_ALL)
EnumValue
Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
EnumValue
Enum(stack_reuse_level) String(none) Value(SR_NONE)
ftree-loop-if-convert
Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
Convert conditional jumps in innermost loops to branchless equivalents
ftree-loop-if-convert-stores
Common Report Var(flag_tree_loop_if_convert_stores) Optimization
Also if-convert conditional jumps containing memory writes
; -finhibit-size-directive inhibits output of .size for ELF.
; This is used only for compiling crtstuff.c,
; and it may be extended to other effects
; needed for crtstuff.c on other systems.
finhibit-size-directive
Common Report Var(flag_inhibit_size_directive)
Do not generate .size directives
findirect-inlining
Common Report Var(flag_indirect_inlining) Optimization
Perform indirect inlining
; General flag to enable inlining. Specifying -fno-inline will disable
; all inlining apart from always-inline functions.
finline
Common Report Var(flag_no_inline,0) Init(0) Optimization
Enable inlining of function declared \"inline\", disabling disables all inlining
finline-small-functions
Common Report Var(flag_inline_small_functions) Optimization
Integrate functions into their callers when code size is known not to grow
finline-functions
Common Report Var(flag_inline_functions) Optimization
Integrate functions not declared \"inline\" into their callers when profitable
finline-functions-called-once
Common Report Var(flag_inline_functions_called_once) Optimization
Integrate functions only required by their single caller
finline-limit-
Common RejectNegative Joined Alias(finline-limit=)
finline-limit=
Common RejectNegative Joined UInteger
-finline-limit= Limit the size of inlined functions to
finline-atomics
Common Report Var(flag_inline_atomics) Init(1) Optimization
Inline __atomic operations when a lock free instruction sequence is available.
finstrument-functions
Common Report Var(flag_instrument_function_entry_exit)
Instrument function entry and exit with profiling calls
finstrument-functions-exclude-function-list=
Common RejectNegative Joined
-finstrument-functions-exclude-function-list=name,... Do not instrument listed functions
finstrument-functions-exclude-file-list=
Common RejectNegative Joined
-finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files
fipa-cp
Common Report Var(flag_ipa_cp) Optimization
Perform interprocedural constant propagation
fipa-cp-clone
Common Report Var(flag_ipa_cp_clone) Optimization
Perform cloning to make Interprocedural constant propagation stronger
fipa-cp-alignment
Common Report Var(flag_ipa_cp_alignment) Optimization
Perform alignment discovery and propagation to make Interprocedural constant propagation stronger
fipa-profile
Common Report Var(flag_ipa_profile) Init(0) Optimization
Perform interprocedural profile propagation
fipa-pta
Common Report Var(flag_ipa_pta) Init(0) Optimization
Perform interprocedural points-to analysis
fipa-pure-const
Common Report Var(flag_ipa_pure_const) Init(0) Optimization
Discover pure and const functions
fipa-icf
Common Report Var(flag_ipa_icf) Optimization
Perform Identical Code Folding for functions and read-only variables
fipa-icf-functions
Common Report Var(flag_ipa_icf_functions) Optimization
Perform Identical Code Folding for functions
fipa-icf-variables
Common Report Var(flag_ipa_icf_variables)
Perform Identical Code Folding for variables
fipa-reference
Common Report Var(flag_ipa_reference) Init(0) Optimization
Discover readonly and non addressable static variables
fipa-matrix-reorg
Common Ignore
Does nothing. Preserved for backward compatibility.
fipa-struct-reorg
Common Ignore
Does nothing. Preserved for backward compatibility.
fira-algorithm=
Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB) Optimization
-fira-algorithm=[CB|priority] Set the used IRA algorithm
Enum
Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
EnumValue
Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB)
EnumValue
Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
fira-region=
Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT) Optimization
-fira-region=[one|all|mixed] Set regions for IRA
Enum
Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs)
EnumValue
Enum(ira_region) String(one) Value(IRA_REGION_ONE)
EnumValue
Enum(ira_region) String(all) Value(IRA_REGION_ALL)
EnumValue
Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
fira-hoist-pressure
Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
Use IRA based register pressure calculation
in RTL hoist optimizations.
fira-loop-pressure
Common Report Var(flag_ira_loop_pressure) Optimization
Use IRA based register pressure calculation
in RTL loop optimizations.
fira-share-save-slots
Common Report Var(flag_ira_share_save_slots) Init(1) Optimization
Share slots for saving different hard registers.
fira-share-spill-slots
Common Report Var(flag_ira_share_spill_slots) Init(1) Optimization
Share stack slots for spilled pseudo-registers.
fira-verbose=
Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
-fira-verbose= Control IRA's level of diagnostic messages.
fivopts
Common Report Var(flag_ivopts) Init(1) Optimization
Optimize induction variables on trees
fjump-tables
Common Var(flag_jump_tables) Init(1) Optimization
Use jump tables for sufficiently large switch statements
fkeep-inline-functions
Common Report Var(flag_keep_inline_functions)
Generate code for functions even if they are fully inlined
fkeep-static-functions
Common Report Var(flag_keep_static_functions)
Generate code for static functions even if they are never called
fkeep-static-consts
Common Report Var(flag_keep_static_consts) Init(1)
Emit static const variables even if they are not used
fleading-underscore
Common Report Var(flag_leading_underscore) Init(-1)
Give external symbols a leading underscore
floop-optimize
Common Ignore
Does nothing. Preserved for backward compatibility.
flra-remat
Common Report Var(flag_lra_remat) Optimization
Do CFG-sensitive rematerialization in LRA
flto
Common
Enable link-time optimization.
flto=
Common RejectNegative Joined Var(flag_lto)
Link-time optimization with number of parallel jobs or jobserver.
Enum
Name(lto_partition_model) Type(enum lto_partition_model) UnknownError(unknown LTO partitioning model %qs)
EnumValue
Enum(lto_partition_model) String(none) Value(LTO_PARTITION_NONE)
EnumValue
Enum(lto_partition_model) String(one) Value(LTO_PARTITION_ONE)
EnumValue
Enum(lto_partition_model) String(balanced) Value(LTO_PARTITION_BALANCED)
EnumValue
Enum(lto_partition_model) String(1to1) Value(LTO_PARTITION_1TO1)
EnumValue
Enum(lto_partition_model) String(max) Value(LTO_PARTITION_MAX)
flto-partition=
Common Joined RejectNegative Enum(lto_partition_model) Var(flag_lto_partition) Init(LTO_PARTITION_BALANCED)
Specify the algorithm to partition symbols and vars at linktime
; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
flto-compression-level=
Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
-flto-compression-level= Use zlib compression level for IL
flto-odr-type-merging
Common Report Var(flag_lto_odr_type_mering) Init(1)
Merge C++ types using One Definition Rule
flto-report
Common Report Var(flag_lto_report) Init(0)
Report various link-time optimization statistics
flto-report-wpa
Common Report Var(flag_lto_report_wpa) Init(0)
Report various link-time optimization statistics for WPA only
fmath-errno
Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
Set errno after built-in math functions
fmax-errors=
Common Joined RejectNegative UInteger Var(flag_max_errors)
-fmax-errors= Maximum number of errors to report
fmem-report
Common Report Var(mem_report)
Report on permanent memory allocation
fmem-report-wpa
Common Report Var(mem_report_wpa)
Report on permanent memory allocation in WPA only
; This will attempt to merge constant section constants, if 1 only
; string constants and constants from constant pool, if 2 also constant
; variables.
fmerge-all-constants
Common Report Var(flag_merge_constants,2) Init(1)
Attempt to merge identical constants and constant variables
fmerge-constants
Common Report Var(flag_merge_constants,1)
Attempt to merge identical constants across compilation units
fmerge-debug-strings
Common Report Var(flag_merge_debug_strings) Init(1)
Attempt to merge identical debug strings across compilation units
fmessage-length=
Common RejectNegative Joined UInteger
-fmessage-length= Limit diagnostics to characters per line. 0 suppresses line-wrapping
fmodulo-sched
Common Report Var(flag_modulo_sched) Optimization
Perform SMS based modulo scheduling before the first scheduling pass
fmodulo-sched-allow-regmoves
Common Report Var(flag_modulo_sched_allow_regmoves) Optimization
Perform SMS based modulo scheduling with register moves allowed
fmove-loop-invariants
Common Report Var(flag_move_loop_invariants) Optimization
Move loop invariant computations out of loops
fdce
Common Var(flag_dce) Init(1) Optimization
Use the RTL dead code elimination pass
fdse
Common Var(flag_dse) Init(1) Optimization
Use the RTL dead store elimination pass
freschedule-modulo-scheduled-loops
Common Report Var(flag_resched_modulo_sched) Optimization
Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
fnon-call-exceptions
Common Report Var(flag_non_call_exceptions) Optimization
Support synchronous non-call exceptions
foffload=
Common Driver Joined MissingArgError(options or targets missing after %qs)
-foffload== Specify offloading targets and options for them
foffload-abi=
Common Joined RejectNegative Enum(offload_abi) Var(flag_offload_abi) Init(OFFLOAD_ABI_UNSET)
-foffload-abi=[lp64|ilp32] Set the ABI to use in an offload compiler
Enum
Name(offload_abi) Type(enum offload_abi) UnknownError(unknown offload ABI %qs)
EnumValue
Enum(offload_abi) String(ilp32) Value(OFFLOAD_ABI_ILP32)
EnumValue
Enum(offload_abi) String(lp64) Value(OFFLOAD_ABI_LP64)
fomit-frame-pointer
Common Report Var(flag_omit_frame_pointer) Optimization
When possible do not generate stack frames
fopt-info
Common Report Var(flag_opt_info) Optimization
Enable all optimization info dumps on stderr
fopt-info-
Common Joined RejectNegative Var(common_deferred_options) Defer
-fopt-info[-=filename] Dump compiler optimization details
foptimize-register-move
Common Ignore
Does nothing. Preserved for backward compatibility.
foptimize-sibling-calls
Common Report Var(flag_optimize_sibling_calls) Optimization
Optimize sibling and tail recursive calls
fpartial-inlining
Common Report Var(flag_partial_inlining) Optimization
Perform partial inlining
fpre-ipa-mem-report
Common Report Var(pre_ipa_mem_report)
Report on memory allocation before interprocedural optimization
fpost-ipa-mem-report
Common Report Var(post_ipa_mem_report)
Report on memory allocation before interprocedural optimization
fpack-struct
Common Report Var(flag_pack_struct) Optimization
Pack structure members together without holes
fpack-struct=
Common RejectNegative Joined UInteger Optimization
-fpack-struct= Set initial maximum structure member alignment
fpcc-struct-return
Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
Return small aggregates in memory, not registers
fpeel-loops
Common Report Var(flag_peel_loops) Optimization
Perform loop peeling
fpeephole
Common Report Var(flag_no_peephole,0) Optimization
Enable machine specific peephole optimizations
fpeephole2
Common Report Var(flag_peephole2) Optimization
Enable an RTL peephole pass before sched2
fPIC
Common Report Var(flag_pic,2) Negative(fPIE)
Generate position-independent code if possible (large mode)
fPIE
Common Report Var(flag_pie,2) Negative(fpic) Init(-1)
Generate position-independent code for executables if possible (large mode)
fpic
Common Report Var(flag_pic,1) Negative(fpie)
Generate position-independent code if possible (small mode)
fpie
Common Report Var(flag_pie,1) Negative(fPIC) Init(-1)
Generate position-independent code for executables if possible (small mode)
fplt
Common Report Var(flag_plt) Init(1) Optimization
Use PLT for PIC calls (-fno-plt: load the address from GOT at call site)
fplugin=
Common Joined RejectNegative Var(common_deferred_options) Defer
Specify a plugin to load
fplugin-arg-
Common Joined RejectNegative Var(common_deferred_options) Defer
-fplugin-arg--[=] Specify argument = for plugin
fpredictive-commoning
Common Report Var(flag_predictive_commoning) Optimization
Run predictive commoning optimization.
fprefetch-loop-arrays
Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
Generate prefetch instructions, if available, for arrays in loops
fprofile
Common Report Var(profile_flag)
Enable basic program profiling code
fprofile-arcs
Common Report Var(profile_arc_flag)
Insert arc-based program profiling code
fprofile-dir=
Common Joined RejectNegative Var(profile_data_prefix)
Set the top-level directory for storing the profile data.
The default is 'pwd'.
fprofile-correction
Common Report Var(flag_profile_correction)
Enable correction of flow inconsistent profile data input
fprofile-generate
Common
Enable common options for generating profile info for profile feedback directed optimizations
fprofile-generate=
Common Joined RejectNegative
Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
fprofile-use
Common Var(flag_profile_use)
Enable common options for performing profile feedback directed optimizations
fprofile-use=
Common Joined RejectNegative
Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
fprofile-values
Common Report Var(flag_profile_values)
Insert code to profile values of expressions
fprofile-report
Common Report Var(profile_report)
Report on consistency of profile
fprofile-reorder-functions
Common Report Var(flag_profile_reorder_functions)
Enable function reordering that improves code placement
frandom-seed
Common Var(common_deferred_options) Defer
frandom-seed=
Common Joined RejectNegative Var(common_deferred_options) Defer
-frandom-seed= Make compile reproducible using
; This switch causes the command line that was used to create an
; object file to be recorded into the object file. The exact format
; of this recording is target and binary file format dependent.
; It is related to the -fverbose-asm switch, but that switch only
; records information in the assembler output file as comments, so
; they never reach the object file.
frecord-gcc-switches
Common Report Var(flag_record_gcc_switches)
Record gcc command line switches in the object file.
freg-struct-return
Common Report Var(flag_pcc_struct_return,0) Optimization
Return small aggregates in registers
fregmove
Common Ignore
Does nothing. Preserved for backward compatibility.
flifetime-dse
Common Report Var(flag_lifetime_dse) Init(1) Optimization
Tell DSE that the storage for a C++ object is dead when the constructor
starts and when the destructor finishes.
flive-range-shrinkage
Common Report Var(flag_live_range_shrinkage) Init(0) Optimization
Relief of register pressure through live range shrinkage
frename-registers
Common Report Var(flag_rename_registers) Init(2) Optimization
Perform a register renaming optimization pass
fschedule-fusion
Common Report Var(flag_schedule_fusion) Init(2) Optimization
Perform a target dependent instruction fusion optimization pass
freorder-blocks
Common Report Var(flag_reorder_blocks) Optimization
Reorder basic blocks to improve code placement
freorder-blocks-algorithm=
Common Joined RejectNegative Enum(reorder_blocks_algorithm) Var(flag_reorder_blocks_algorithm) Init(REORDER_BLOCKS_ALGORITHM_SIMPLE) Optimization
-freorder-blocks-algorithm=[simple|stc] Set the used basic block reordering algorithm
Enum
Name(reorder_blocks_algorithm) Type(enum reorder_blocks_algorithm) UnknownError(unknown basic block reordering algorithm %qs)
EnumValue
Enum(reorder_blocks_algorithm) String(simple) Value(REORDER_BLOCKS_ALGORITHM_SIMPLE)
EnumValue
Enum(reorder_blocks_algorithm) String(stc) Value(REORDER_BLOCKS_ALGORITHM_STC)
freorder-blocks-and-partition
Common Report Var(flag_reorder_blocks_and_partition) Optimization
Reorder basic blocks and partition into hot and cold sections
freorder-functions
Common Report Var(flag_reorder_functions) Optimization
Reorder functions to improve code placement
frerun-cse-after-loop
Common Report Var(flag_rerun_cse_after_loop) Optimization
Add a common subexpression elimination pass after loop optimizations
frerun-loop-opt
Common Ignore
Does nothing. Preserved for backward compatibility.
frounding-math
Common Report Var(flag_rounding_math) Optimization SetByCombined
Disable optimizations that assume default FP rounding behavior
fsched-interblock
Common Report Var(flag_schedule_interblock) Init(1) Optimization
Enable scheduling across basic blocks
fsched-pressure
Common Report Var(flag_sched_pressure) Init(0) Optimization
Enable register pressure sensitive insn scheduling
fsched-spec
Common Report Var(flag_schedule_speculative) Init(1) Optimization
Allow speculative motion of non-loads
fsched-spec-load
Common Report Var(flag_schedule_speculative_load) Optimization
Allow speculative motion of some loads
fsched-spec-load-dangerous
Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
Allow speculative motion of more loads
fsched-verbose=
Common RejectNegative Joined UInteger Var(sched_verbose_param)
-fsched-verbose= Set the verbosity level of the scheduler
fsched2-use-superblocks
Common Report Var(flag_sched2_use_superblocks) Optimization
If scheduling post reload, do superblock scheduling
fsched2-use-traces
Common Ignore
Does nothing. Preserved for backward compatibility.
fschedule-insns
Common Report Var(flag_schedule_insns) Optimization
Reschedule instructions before register allocation
fschedule-insns2
Common Report Var(flag_schedule_insns_after_reload) Optimization
Reschedule instructions after register allocation
; This flag should be on when a target implements non-trivial
; scheduling hooks, maybe saving some information for its own sake.
; On IA64, for example, this is used for correct bundling.
fselective-scheduling
Common Report Var(flag_selective_scheduling) Optimization
Schedule instructions using selective scheduling algorithm
fselective-scheduling2
Common Report Var(flag_selective_scheduling2) Optimization
Run selective scheduling after reload
fsel-sched-pipelining
Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
Perform software pipelining of inner loops during selective scheduling
fsel-sched-pipelining-outer-loops
Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
Perform software pipelining of outer loops during selective scheduling
fsel-sched-reschedule-pipelined
Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
Reschedule pipelined regions without pipelining
fsemantic-interposition
Common Report Var(flag_semantic_interposition) Init(1)
Allow interposing function (or variables) by ones with different semantics (or initializer) respectively by dynamic linker
; sched_stalled_insns means that insns can be moved prematurely from the queue
; of stalled insns into the ready list.
fsched-stalled-insns
Common Report Var(flag_sched_stalled_insns) Optimization UInteger
Allow premature scheduling of queued insns
fsched-stalled-insns=
Common RejectNegative Joined UInteger Optimization
-fsched-stalled-insns= Set number of queued insns that can be prematurely scheduled
; sched_stalled_insns_dep controls how many recently scheduled cycles will
; be examined for a dependency on a stalled insn that is candidate for
; premature removal from the queue of stalled insns into the ready list (has
; an effect only if the flag 'sched_stalled_insns' is set).
fsched-stalled-insns-dep
Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
Set dependence distance checking in premature scheduling of queued insns
fsched-stalled-insns-dep=
Common RejectNegative Joined UInteger Optimization
-fsched-stalled-insns-dep= Set dependence distance checking in premature scheduling of queued insns
fsched-group-heuristic
Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
Enable the group heuristic in the scheduler
fsched-critical-path-heuristic
Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
Enable the critical path heuristic in the scheduler
fsched-spec-insn-heuristic
Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
Enable the speculative instruction heuristic in the scheduler
fsched-rank-heuristic
Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
Enable the rank heuristic in the scheduler
fsched-last-insn-heuristic
Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
Enable the last instruction heuristic in the scheduler
fsched-dep-count-heuristic
Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
Enable the dependent count heuristic in the scheduler
fsection-anchors
Common Report Var(flag_section_anchors) Optimization
Access data in the same section from shared anchor points
fsee
Common Ignore
Does nothing. Preserved for backward compatibility.
fzee
Common Ignore
Does nothing. Preserved for backward compatibility.
free
Common Report Var(flag_ree) Init(0)
Turn on Redundant Extensions Elimination pass.
fshow-column
Common Report Var(flag_show_column) Init(1)
Show column numbers in diagnostics, when available. Default on
fshrink-wrap
Common Report Var(flag_shrink_wrap) Optimization
Emit function prologues only before parts of the function that need it,
rather than at the top of the function.
fsignaling-nans
Common Report Var(flag_signaling_nans) Optimization SetByCombined
Disable optimizations observable by IEEE signaling NaNs
fsigned-zeros
Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
Disable floating point optimizations that ignore the IEEE signedness of zero
fsingle-precision-constant
Common Report Var(flag_single_precision_constant) Optimization
Convert floating point constants to single precision constants
fsplit-ivs-in-unroller
Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
Split lifetimes of induction variables when loops are unrolled
fsplit-stack
Common Report Var(flag_split_stack) Init(-1)
Generate discontiguous stack frames
fsplit-wide-types
Common Report Var(flag_split_wide_types) Optimization
Split wide types into independent registers
fssa-phiopt
Common Report Var(flag_ssa_phiopt) Optimization
Optimize conditional patterns using SSA PHI nodes
fstdarg-opt
Common Report Var(flag_stdarg_opt) Init(1) Optimization
Optimize amount of stdarg registers saved to stack at start of function
fvariable-expansion-in-unroller
Common Report Var(flag_variable_expansion_in_unroller) Optimization
Apply variable expansion when loops are unrolled
fstack-check=
Common Report RejectNegative Joined
-fstack-check=[no|generic|specific] Insert stack checking code into the program
fstack-check
Common Alias(fstack-check=, specific, no)
Insert stack checking code into the program. Same as -fstack-check=specific
fstack-limit
Common Var(common_deferred_options) Defer
fstack-limit-register=
Common RejectNegative Joined Var(common_deferred_options) Defer
-fstack-limit-register= Trap if the stack goes past
fstack-limit-symbol=
Common RejectNegative Joined Var(common_deferred_options) Defer
-fstack-limit-symbol= Trap if the stack goes past symbol
fstack-protector
Common Report Var(flag_stack_protect, 1) Init(-1)
Use propolice as a stack protection method
fstack-protector-all
Common Report RejectNegative Var(flag_stack_protect, 2) Init(-1)
Use a stack protection method for every function
fstack-protector-strong
Common Report RejectNegative Var(flag_stack_protect, 3) Init(-1)
Use a smart stack protection method for certain functions
fstack-protector-explicit
Common Report RejectNegative Var(flag_stack_protect, 4)
Use stack protection method only for functions with the stack_protect attribute
fstack-usage
Common RejectNegative Var(flag_stack_usage)
Output stack usage information on a per-function basis
fstrength-reduce
Common Ignore
Does nothing. Preserved for backward compatibility.
; Nonzero if we should do (language-dependent) alias analysis.
; Typically, this analysis will assume that expressions of certain
; types do not alias expressions of certain other types. Only used
; if alias analysis (in general) is enabled.
fstrict-aliasing
Common Report Var(flag_strict_aliasing) Optimization
Assume strict aliasing rules apply
fstrict-overflow
Common Report Var(flag_strict_overflow) Optimization
Treat signed overflow as undefined
fsync-libcalls
Common Report Var(flag_sync_libcalls) Init(1)
Implement __atomic operations via libcalls to legacy __sync functions
fsyntax-only
Common Report Var(flag_syntax_only)
Check for syntax errors, then stop
ftest-coverage
Common Report Var(flag_test_coverage)
Create data files needed by \"gcov\"
fthread-jumps
Common Report Var(flag_thread_jumps) Optimization
Perform jump threading optimizations
ftime-report
Common Report Var(time_report)
Report the time taken by each compiler pass
ftls-model=
Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC)
-ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
Enum
Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs)
EnumValue
Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC)
EnumValue
Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC)
EnumValue
Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC)
EnumValue
Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
ftoplevel-reorder
Common Report Var(flag_toplevel_reorder) Init(2)
Reorder top level functions, variables, and asms
ftracer
Common Report Var(flag_tracer) Optimization
Perform superblock formation via tail duplication
; Zero means that floating-point math operations cannot generate a
; (user-visible) trap. This is the case, for example, in nonstop
; IEEE 754 arithmetic.
ftrapping-math
Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
Assume floating-point operations can trap
ftrapv
Common Report Var(flag_trapv) Optimization
Trap for signed overflow in addition, subtraction and multiplication
ftree-ccp
Common Report Var(flag_tree_ccp) Optimization
Enable SSA-CCP optimization on trees
ftree-bit-ccp
Common Report Var(flag_tree_bit_ccp) Optimization
Enable SSA-BIT-CCP optimization on trees
ftree-store-ccp
Common Ignore
Does nothing. Preserved for backward compatibility.
ftree-ch
Common Report Var(flag_tree_ch) Optimization
Enable loop header copying on trees
ftree-coalesce-inlined-vars
Common Ignore RejectNegative
Does nothing. Preserved for backward compatibility.
ftree-coalesce-vars
Common Report Var(flag_tree_coalesce_vars) Optimization
Enable SSA coalescing of user variables
ftree-copyrename
Common Ignore
Does nothing. Preserved for backward compatibility.
ftree-copy-prop
Common Report Var(flag_tree_copy_prop) Optimization
Enable copy propagation on trees
ftree-store-copy-prop
Common Ignore
Does nothing. Preserved for backward compatibility.
ftree-cselim
Common Report Var(flag_tree_cselim) Init(2) Optimization
Transform condition stores into unconditional ones
ftree-switch-conversion
Common Report Var(flag_tree_switch_conversion) Optimization
Perform conversions of switch initializations.
ftree-dce
Common Report Var(flag_tree_dce) Optimization
Enable SSA dead code elimination optimization on trees
ftree-dominator-opts
Common Report Var(flag_tree_dom) Optimization
Enable dominator optimizations
ftree-tail-merge
Common Report Var(flag_tree_tail_merge) Optimization
Enable tail merging on trees
ftree-dse
Common Report Var(flag_tree_dse) Optimization
Enable dead store elimination
ftree-forwprop
Common Report Var(flag_tree_forwprop) Init(1) Optimization
Enable forward propagation on trees
ftree-fre
Common Report Var(flag_tree_fre) Optimization
Enable Full Redundancy Elimination (FRE) on trees
foptimize-strlen
Common Report Var(flag_optimize_strlen) Optimization
Enable string length optimizations on trees
fisolate-erroneous-paths-dereference
Common Report Var(flag_isolate_erroneous_paths_dereference) Optimization
Detect paths that trigger erroneous or undefined behavior due to
dereferencing a null pointer. Isolate those paths from the main control
flow and turn the statement with erroneous or undefined behavior into a trap.
fisolate-erroneous-paths-attribute
Common Report Var(flag_isolate_erroneous_paths_attribute) Optimization
Detect paths that trigger erroneous or undefined behavior due a null value
being used in a way forbidden by a returns_nonnull or nonnull
attribute. Isolate those paths from the main control flow and turn the
statement with erroneous or undefined behavior into a trap.
ftree-loop-distribution
Common Report Var(flag_tree_loop_distribution) Optimization
Enable loop distribution on trees
ftree-loop-distribute-patterns
Common Report Var(flag_tree_loop_distribute_patterns) Optimization
Enable loop distribution for patterns transformed into a library call
ftree-loop-im
Common Report Var(flag_tree_loop_im) Init(1) Optimization
Enable loop invariant motion on trees
ftree-loop-linear
Common Alias(floop-nest-optimize)
Enable loop nest transforms. Same as -floop-nest-optimize
ftree-loop-ivcanon
Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
Create canonical induction variables in loops
ftree-loop-optimize
Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
Enable loop optimizations on tree level
ftree-parallelize-loops=
Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1) Optimization
Enable automatic parallelization of loops
ftree-phiprop
Common Report Var(flag_tree_phiprop) Init(1) Optimization
Enable hoisting loads from conditional pointers.
ftree-pre
Common Report Var(flag_tree_pre) Optimization
Enable SSA-PRE optimization on trees
ftree-partial-pre
Common Report Var(flag_tree_partial_pre) Optimization
In SSA-PRE optimization on trees, enable partial-partial redundancy elimination
ftree-pta
Common Report Var(flag_tree_pta) Optimization
Perform function-local points-to analysis on trees.
ftree-reassoc
Common Report Var(flag_tree_reassoc) Init(1) Optimization
Enable reassociation on tree level
ftree-salias
Common Ignore
Does nothing. Preserved for backward compatibility.
ftree-sink
Common Report Var(flag_tree_sink) Optimization
Enable SSA code sinking on trees
ftree-slsr
Common Report Var(flag_tree_slsr) Optimization
Perform straight-line strength reduction
ftree-sra
Common Report Var(flag_tree_sra) Optimization
Perform scalar replacement of aggregates
ftree-ter
Common Report Var(flag_tree_ter) Optimization
Replace temporary expressions in the SSA->normal pass
ftree-lrs
Common Report Var(flag_tree_live_range_split) Optimization
Perform live range splitting during the SSA->normal pass
ftree-vrp
Common Report Var(flag_tree_vrp) Init(0) Optimization
Perform Value Range Propagation on trees
funit-at-a-time
Common Report Var(flag_unit_at_a_time) Init(1)
Compile whole compilation unit at a time
funroll-loops
Common Report Var(flag_unroll_loops) Optimization
Perform loop unrolling when iteration count is known
funroll-all-loops
Common Report Var(flag_unroll_all_loops) Optimization
Perform loop unrolling for all loops
; Nonzero means that loop optimizer may assume that the induction variables
; that control loops do not overflow and that the loops with nontrivial
; exit condition are not infinite
funsafe-loop-optimizations
Common Report Var(flag_unsafe_loop_optimizations) Optimization
Allow loop optimizations to assume that the loops behave in normal way
fassociative-math
Common Report Var(flag_associative_math) SetByCombined Optimization
Allow optimization for floating-point arithmetic which may change the
result of the operation due to rounding.
freciprocal-math
Common Report Var(flag_reciprocal_math) SetByCombined Optimization
Same as -fassociative-math for expressions which include division.
; Nonzero means that unsafe floating-point math optimizations are allowed
; for the sake of speed. IEEE compliance is not guaranteed, and operations
; are allowed to assume that their arguments and results are "normal"
; (e.g., nonnegative for SQRT).
funsafe-math-optimizations
Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
Allow math optimizations that may violate IEEE or ISO standards
funswitch-loops
Common Report Var(flag_unswitch_loops) Optimization
Perform loop unswitching
funwind-tables
Common Report Var(flag_unwind_tables) Optimization
Just generate unwind tables for exception handling
fuse-ld=bfd
Common Driver Negative(fuse-ld=gold)
Use the bfd linker instead of the default linker
fuse-ld=gold
Common Driver Negative(fuse-ld=bfd)
Use the gold linker instead of the default linker
fuse-linker-plugin
Common Undocumented Var(flag_use_linker_plugin)
; Positive if we should track variables, negative if we should run
; the var-tracking pass only to discard debug annotations, zero if
; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
; will be set according to optimize, debug_info_level and debug_hooks
; in process_options ().
fvar-tracking
Common Report Var(flag_var_tracking) Init(2) Optimization
Perform variable tracking
; Positive if we should track variables at assignments, negative if
; we should run the var-tracking pass only to discard debug
; annotations. When flag_var_tracking_assignments ==
; AUTODETECT_VALUE it will be set according to flag_var_tracking.
fvar-tracking-assignments
Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
Perform variable tracking by annotating assignments
; Nonzero if we should toggle flag_var_tracking_assignments after
; processing options and computing its default. */
fvar-tracking-assignments-toggle
Common Report Var(flag_var_tracking_assignments_toggle) Optimization
Toggle -fvar-tracking-assignments
; Positive if we should track uninitialized variables, negative if
; we should run the var-tracking pass only to discard debug
; annotations. When flag_var_tracking_uninit == AUTODETECT_VALUE it
; will be set according to flag_var_tracking.
fvar-tracking-uninit
Common Report Var(flag_var_tracking_uninit) Optimization
Perform variable tracking and also tag variables that are uninitialized
ftree-vectorize
Common Report Var(flag_tree_vectorize) Optimization
Enable vectorization on trees
ftree-vectorizer-verbose=
Common Joined RejectNegative Ignore
Does nothing. Preserved for backward compatibility.
ftree-loop-vectorize
Common Report Var(flag_tree_loop_vectorize) Optimization
Enable loop vectorization on trees
ftree-slp-vectorize
Common Report Var(flag_tree_slp_vectorize) Optimization
Enable basic block vectorization (SLP) on trees
fvect-cost-model=
Common Joined RejectNegative Enum(vect_cost_model) Var(flag_vect_cost_model) Init(VECT_COST_MODEL_DEFAULT) Optimization
Specifies the cost model for vectorization
fsimd-cost-model=
Common Joined RejectNegative Enum(vect_cost_model) Var(flag_simd_cost_model) Init(VECT_COST_MODEL_UNLIMITED) Optimization
Specifies the vectorization cost model for code marked with a simd directive
Enum
Name(vect_cost_model) Type(enum vect_cost_model) UnknownError(unknown vectorizer cost model %qs)
EnumValue
Enum(vect_cost_model) String(unlimited) Value(VECT_COST_MODEL_UNLIMITED)
EnumValue
Enum(vect_cost_model) String(dynamic) Value(VECT_COST_MODEL_DYNAMIC)
EnumValue
Enum(vect_cost_model) String(cheap) Value(VECT_COST_MODEL_CHEAP)
fvect-cost-model
Common RejectNegative Alias(fvect-cost-model=,dynamic)
Enables the dynamic vectorizer cost model. Preserved for backward compatibility.
fno-vect-cost-model
Common RejectNegative Alias(fvect-cost-model=,unlimited)
Enables the unlimited vectorizer cost model. Preserved for backward compatibility.
ftree-vect-loop-version
Common Ignore
Does nothing. Preserved for backward compatibility.
ftree-scev-cprop
Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
Enable copy propagation of scalar-evolution information.
; -fverbose-asm causes extra commentary information to be produced in
; the generated assembly code (to make it more readable). This option
; is generally only of use to those who actually need to read the
; generated assembly code (perhaps while debugging the compiler itself).
; -fno-verbose-asm, the default, causes the extra information
; to not be added and is useful when comparing two assembler files.
fverbose-asm
Common Report Var(flag_verbose_asm)
Add extra commentary to assembler output
fvisibility=
Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT)
-fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
Enum
Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs)
EnumValue
Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT)
EnumValue
Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL)
EnumValue
Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN)
EnumValue
Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED)
fvtable-verify=
Common Joined RejectNegative Enum(vtv_priority) Var(flag_vtable_verify) Init(VTV_NO_PRIORITY)
Validate vtable pointers before using them.
Enum
Name(vtv_priority) Type(enum vtv_priority) UnknownError(unknown vtable verify initialization priority %qs)
EnumValue
Enum(vtv_priority) String(none) Value(VTV_NO_PRIORITY)
EnumValue
Enum(vtv_priority) String(std) Value(VTV_STANDARD_PRIORITY)
EnumValue
Enum(vtv_priority) String(preinit) Value(VTV_PREINIT_PRIORITY)
fvtv-counts
Common Var(flag_vtv_counts)
Output vtable verification counters.
fvtv-debug
Common Var(flag_vtv_debug)
Output vtable verification pointer sets information.
fvpt
Common Report Var(flag_value_profile_transformations) Optimization
Use expression value profiles in optimizations
fweb
Common Report Var(flag_web) Init(2) Optimization
Construct webs and split unrelated uses of single variable
ftree-builtin-call-dce
Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
Enable conditional dead code elimination for builtin calls
fwhole-program
Common Report Var(flag_whole_program) Init(0)
Perform whole program optimizations
fwrapv
Common Report Var(flag_wrapv) Optimization
Assume signed arithmetic overflow wraps around
fzero-initialized-in-bss
Common Report Var(flag_zero_initialized_in_bss) Init(1)
Put zero initialized data in the bss section
g
Common JoinedOrMissing
Generate debug information in default format
gcoff
Common JoinedOrMissing Negative(gdwarf)
Generate debug information in COFF format
gdwarf
Common JoinedOrMissing Negative(gdwarf-)
Generate debug information in default version of DWARF format
gdwarf-
Common Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
Generate debug information in DWARF v2 (or later) format
ggdb
Common JoinedOrMissing
Generate debug information in default extended format
gno-pubnames
Common Negative(gpubnames) Var(debug_generate_pub_sections, 0) Init(-1)
Don't generate DWARF pubnames and pubtypes sections.
gpubnames
Common Negative(ggnu-pubnames) Var(debug_generate_pub_sections, 1)
Generate DWARF pubnames and pubtypes sections.
ggnu-pubnames
Common Negative(gno-pubnames) Var(debug_generate_pub_sections, 2)
Generate DWARF pubnames and pubtypes sections with GNU extensions.
gno-record-gcc-switches
Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(1)
Don't record gcc command line switches in DWARF DW_AT_producer.
grecord-gcc-switches
Common RejectNegative Var(dwarf_record_gcc_switches,1)
Record gcc command line switches in DWARF DW_AT_producer.
gno-split-dwarf
Common Driver RejectNegative Var(dwarf_split_debug_info,0) Init(0)
Don't generate debug information in separate .dwo files
gsplit-dwarf
Common Driver RejectNegative Var(dwarf_split_debug_info,1)
Generate debug information in separate .dwo files
gstabs
Common JoinedOrMissing Negative(gstabs+)
Generate debug information in STABS format
gstabs+
Common JoinedOrMissing Negative(gvms)
Generate debug information in extended STABS format
gno-strict-dwarf
Common RejectNegative Var(dwarf_strict,0) Init(0)
Emit DWARF additions beyond selected version
gstrict-dwarf
Common Report RejectNegative Var(dwarf_strict,1)
Don't emit DWARF additions beyond selected version
gtoggle
Common Report Var(flag_gtoggle)
Toggle debug information generation
gvms
Common JoinedOrMissing Negative(gxcoff)
Generate debug information in VMS format
gxcoff
Common JoinedOrMissing Negative(gxcoff+)
Generate debug information in XCOFF format
gxcoff+
Common JoinedOrMissing Negative(gcoff)
Generate debug information in extended XCOFF format
Enum
Name(compressed_debug_sections) Type(int)
; Since -gz= is completely handled in specs, the values aren't used and we
; assign arbitrary constants.
EnumValue
Enum(compressed_debug_sections) String(none) Value(0)
EnumValue
Enum(compressed_debug_sections) String(zlib) Value(1)
EnumValue
Enum(compressed_debug_sections) String(zlib-gnu) Value(2)
gz
Common Driver
Generate compressed debug sections
gz=
Common Driver Joined Enum(compressed_debug_sections)
-gz= Generate compressed debug sections in format
h
Driver Joined Separate
iplugindir=
Common Joined Var(plugindir_string) Init(0)
-iplugindir= Set to be the default plugin directory
imultiarch
Common Joined Separate RejectDriver Var(imultiarch) Init(0)
-imultiarch Set to be the multiarch include subdirectory
l
Driver Joined Separate
n
Driver
no-canonical-prefixes
Driver
nodefaultlibs
Driver
nostartfiles
Driver
nostdlib
Driver
o
Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
-o Place output into
p
Common Var(profile_flag)
Enable function profiling
pass-exit-codes
Driver Var(pass_exit_codes)
pedantic
Common Alias(Wpedantic)
pedantic-errors
Common Var(flag_pedantic_errors)
Like -pedantic but issue them as errors
pg
Driver
pipe
Driver Var(use_pipes)
print-file-name=
Driver JoinedOrMissing Var(print_file_name)
print-libgcc-file-name
Driver
print-multi-directory
Driver Var(print_multi_directory)
print-multi-lib
Driver Var(print_multi_lib)
print-multi-os-directory
Driver Var(print_multi_os_directory)
print-multiarch
Driver Var(print_multiarch)
print-prog-name=
Driver JoinedOrMissing Var(print_prog_name)
print-search-dirs
Driver Var(print_search_dirs)
print-sysroot
Driver Var(print_sysroot)
print-sysroot-headers-suffix
Driver Var(print_sysroot_headers_suffix)
quiet
Common Var(quiet_flag) RejectDriver
Do not display functions compiled or elapsed time
r
Driver
s
Driver
save-temps
Driver
save-temps=
Driver Joined
t
Driver
time
Driver Var(report_times)
time=
Driver JoinedOrMissing
u
Driver Joined Separate
undef
Driver
; C option, but driver must not handle as "-u ndef".
v
Common Driver Var(verbose_flag)
Enable verbose output
version
Common Var(version_flag) RejectDriver
Display the compiler's version
w
Common Var(inhibit_warnings)
Suppress warnings
wrapper
Driver Separate Var(wrapper_string)
x
Driver Joined Separate
shared
Driver RejectNegative Negative(pie)
Create a shared library
shared-libgcc
Driver
specs
Driver Separate Alias(specs=)
specs=
Driver Joined
static
Driver
static-libgcc
Driver
static-libgfortran
Driver
; Documented for Fortran, but always accepted by driver.
static-libstdc++
Driver
static-libgo
Driver
; Documented for Go, but always accepted by driver.
static-libasan
Driver
static-libtsan
Driver
static-liblsan
Driver
static-libubsan
Driver
symbolic
Driver
no-pie
Driver RejectNegative Negative(shared)
Don't create a position independent executable
pie
Driver RejectNegative Negative(no-pie)
Create a position independent executable
z
Driver Joined Separate
fipa-ra
Common Report Var(flag_ipa_ra) Optimization
Use caller save register across calls if possible
; This comment is to ensure we retain the blank line above.