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invoke.texi (ARM Options): Correct errors in discussion of -mfloat-abi, -mhard-float, and -msoft-float. 

2008-09-09  Sandra Loosemore  <sandra@codesourcery.com>

	gcc/
	* doc/invoke.texi (ARM Options): Correct errors in discussion 
	of -mfloat-abi, -mhard-float, and -msoft-float.

From-SVN: r140179
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Sandra Loosemore 2008-09-09 18:21:10 -04:00 committed by Sandra Loosemore
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2 changed files with 29 additions and 24 deletions
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@ -1,3 +1,8 @@
2008-09-09 Sandra Loosemore <sandra@codesourcery.com>
* doc/invoke.texi (ARM Options): Correct errors in discussion
of -mfloat-abi, -mhard-float, and -msoft-float.
2008-09-09 Jakub Jelinek <jakub@redhat.com> 2008-09-09 Jakub Jelinek <jakub@redhat.com>
Jan Hubicka <jh@suse.cz> Jan Hubicka <jh@suse.cz>

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gcc/doc/invoke.texi
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@ -8740,35 +8740,35 @@ different function prologues), and this information can be used to
locate the start if functions inside an executable piece of code. The locate the start if functions inside an executable piece of code. The
default is @option{-msched-prolog}. default is @option{-msched-prolog}.
@item -mfloat-abi=@var{name}
@opindex mfloat-abi
Specifies which floating-point ABI to use. Permissible values
are: @samp{soft}, @samp{softfp} and @samp{hard}.
Specifying @samp{soft} causes GCC to generate output containing
library calls for floating-point operations.
@samp{softfp} allows the generation of code using hardware floating-point
instructions, but still uses the soft-float calling conventions.
@samp{hard} allows generation of floating-point instructions
and uses FPU-specific calling conventions.
Using @option{-mfloat-abi=hard} with VFP coprocessors is not supported.
Use @option{-mfloat-abi=softfp} with the appropriate @option{-mfpu} option
to allow the compiler to generate code that makes use of the hardware
floating-point capabilities for these CPUs.
The default depends on the specific target configuration. Note that
the hard-float and soft-float ABIs are not link-compatible; you must
compile your entire program with the same ABI, and link with a
compatible set of libraries.
@item -mhard-float @item -mhard-float
@opindex mhard-float @opindex mhard-float
Generate output containing floating point instructions. This is the Equivalent to @option{-mfloat-abi=hard}.
default.
@item -msoft-float @item -msoft-float
@opindex msoft-float @opindex msoft-float
Generate output containing library calls for floating point. Equivalent to @option{-mfloat-abi=soft}.
@strong{Warning:} the requisite libraries are not available for all ARM
targets. Normally the facilities of the machine's usual C compiler are
used, but this cannot be done directly in cross-compilation. You must make
your own arrangements to provide suitable library functions for
cross-compilation.
@option{-msoft-float} changes the calling convention in the output file;
therefore, it is only useful if you compile @emph{all} of a program with
this option. In particular, you need to compile @file{libgcc.a}, the
library that comes with GCC, with @option{-msoft-float} in order for
this to work.
@item -mfloat-abi=@var{name}
@opindex mfloat-abi
Specifies which ABI to use for floating point values. Permissible values
are: @samp{soft}, @samp{softfp} and @samp{hard}.
@samp{soft} and @samp{hard} are equivalent to @option{-msoft-float}
and @option{-mhard-float} respectively. @samp{softfp} allows the generation
of floating point instructions, but still uses the soft-float calling
conventions.
@item -mlittle-endian @item -mlittle-endian
@opindex mlittle-endian @opindex mlittle-endian