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invoke.texi (Darwin Options): Improve description of how the subtype is chosen.

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* doc/invoke.texi (Darwin Options): Improve description of
	how the subtype is chosen.

From-SVN: r89897
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Geoffrey Keating 2004-10-30 20:22:54 +00:00 committed by Geoffrey Keating
parent 61168ff146
commit 46bfe5e30e
2 changed files with 22 additions and 4 deletions
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@ -1,3 +1,8 @@
2004-10-30 Geoffrey Keating <geoffk@apple.com>
* doc/invoke.texi (Darwin Options): Improve description of
how the subtype is chosen.
2004-10-30 Roger Sayle <roger@eyesopen.com>
PR middle-end/18096

21
gcc/doc/invoke.texi
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@ -7190,13 +7190,26 @@ system.
FSF GCC on Darwin does not create ``fat'' object files; it will create
an object file for the single architecture that it was built to
target. Apple's GCC on Darwin does create ``fat'' files if multiple
@option{-arch} options are used.
@option{-arch} options are used; it does so by running the compiler or
linker multiple times and joining the results together with
@file{lipo}.
The subtype of the file created (@var{ppc7400} or @var{ppc970} or
@var{i686}) is determined by the flag that specifies the ISA
that GCC is targetting, @option{-mcpu} or @option{-march}. The
The subtype of the file created (like @samp{ppc7400} or @samp{ppc970} or
@samp{i686}) is determined by the flags that specify the ISA
that GCC is targetting, like @option{-mcpu} or @option{-march}. The
@option{-force_cpusubtype_ALL} option can be used to override this.
The Darwin tools vary in their behaviour when presented with an ISA
mismatch. The assembler, @file{as}, will only permit instructions to
be used that are valid for the subtype of the file it is generating,
so you cannot put 64-bit instructions in an @samp{ppc750} object file.
The linker for shared libraries, @file{/usr/bin/libtool}, will fail
and print an error if asked to create a shared library with a less
restrictive subtype than its input files (for instance, trying to put
a @samp{ppc970} object file in a @samp{ppc7400} library). The linker
for executables, @file{ld}, will quietly give the executable the most
restrictive subtype of any of its input files.
@table @gcctabopt
@item -F@var{dir}
@opindex F