* config.gcc: Reorganize --with-cpu logic. Set

	configure_default_options according to the default CPU, --with-cpu,
	--with-arch, --with-tune, --with-schedule, --with-abi, and
	--with-float.  Check for legal values of various options.
	* configure.in: Define configure_default_options in configargs.h.
	* configure: Regenerated.
	* config/mips/mips.h (TARGET_DEFAULT_ARCH_P)
	(TARGET_DEFAULT_FLOAT_P): New macros.
	* gcc.c (do_option_spec): New function.
	(struct default_spec, option_default_specs): New.
	(main): Call do_option_spec.
	* config/alpha/alpha.h, config/arm/arm.h, config/i386/i386.h,
	config/mips/mips.h, config/pa/pa.h, config/rs6000/rs6000.h,
	config/sparc/sparc.h (OPTION_DEFAULT_SPECS): Define.

	* doc/install.texi: Update --with-cpu documentation.  Mention
	--with-arch, --with-schedule, --with-tune, --with-abi, and
	--with-float.
	* doc/tm.texi (Driver): Document OPTION_DEFAULT_SPECS.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@67457 138bc75d-0d04-0410-961f-82ee72b054a4

2 files changed, 34 insertions, 6 deletions

diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi
index 051a65b489a..7dbb9b9239b 100644
--- a/gcc/doc/install.texi
+++ b/gcc/doc/install.texi
@@ -721,12 +721,21 @@ Microsoft Win32 API thread support.
 @end table
 
 @item --with-cpu=@var{cpu}
-Specify which cpu variant the
-compiler should generate code for by default.  This is currently
-only supported on some ports, specifically arm, powerpc, and
-SPARC@.  If configure does not recognize the model name (e.g.@: arm700,
-603e, or ultrasparc) you provide, please check the
-@file{gcc/config.gcc} script for a complete list of supported models.
+Specify which cpu variant the compiler should generate code for by default.
+@var{cpu} will be used as the default value of the @option{-mcpu=} switch.
+This option is only supported on some targets, including ARM, i386, PowerPC,
+and SPARC@.
+
+@item --with-schedule=@var{cpu}
+@itemx --with-arch=@var{cpu}
+@itemx --with-tune=@var{cpu}
+@itemx --with-abi=@var{abi}
+@itemx --with-float=@var{type}
+These configure options provide default values for the @option{-mschedule=},
+@option{-march=}, @option{-mtune=}, and @option{-mabi=} options and for
+@option{-mhard-float} or @option{-msoft-float}.  As with @option{--with-cpu},
+which switches will be accepted and acceptable values of the arguments depend
+on the target.
 
 @item --enable-altivec
 Specify that the target supports AltiVec vector enhancements.  This
diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi
index ba8e3b1f844..88f20858fa3 100644
--- a/gcc/doc/tm.texi
+++ b/gcc/doc/tm.texi
@@ -181,6 +181,25 @@ that the other specs are easier to write.
 
 Do not define this macro if it does not need to do anything.
 
+@findex OPTION_DEFAULT_SPECS
+@item OPTION_DEFAULT_SPECS
+A list of specs used to support configure-time default options (i.e.@:
+@option{--with} options) in the driver.  It should be a suitable initializer
+for an array of structures, each containing two strings, without the
+outermost pair of surrounding braces.
+
+The first item in the pair is the name of the default.  This must match
+the code in @file{config.gcc} for the target.  The second item is a spec
+to apply if a default with this name was specified.  The string
+@samp{%(VALUE)} in the spec will be replaced by the value of the default
+everywhere it occurs.
+
+The driver will apply these specs to its own command line between loading
+default @file{specs} files and processing @code{DRIVER_SELF_SPECS}, using
+the same mechanism as @code{DRIVER_SELF_SPECS}.
+
+Do not define this macro if it does not need to do anything.
+
 @findex CPP_SPEC
 @item CPP_SPEC
 A C string constant that tells the GCC driver program options to