* config/i386/darwin.h (ASM_SPEC): Simplify.
(SUBTARGET_EXTRA_SPECS): Add darwin_subarch spec.
* config/rs6000/darwin.h (DARWIN_SUBARCH_SPEC): New.
(SUBTARGET_EXTRA_SPECS): Add darwin_subarch spec.
* config/darwin.h (LINK_COMMAND_SPEC): Don't pass -arch here.
(LINK_SPEC): Do pass -arch here. Handle -force_cpusubtype_ALL
in all cases. Pass the right -arch or -arch_only based on -mcpu.
(ASM_SPEC): Handle -force_cpusubtype_ALL.
* doc/invoke.texi (Darwin Options): Improve documentation for
Darwin linker (and libtool) switches.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@89877 138bc75d-0d04-0410-961f-82ee72b054a4