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

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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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@ -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>
Jan Hubicka <jh@suse.cz>

48
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
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
@opindex mhard-float
Generate output containing floating point instructions. This is the
default.
Equivalent to @option{-mfloat-abi=hard}.
@item -msoft-float
@opindex msoft-float
Generate output containing library calls for floating point.
@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.
Equivalent to @option{-mfloat-abi=soft}.
@item -mlittle-endian
@opindex mlittle-endian