* alpha.h (CPP_SPEC): Tidy. Hook to cpp_cpu and cpp_subtarget.
(CPP_SUBTARGET_SPEC): Default to empty string.
(CPP_AM_*, CPP_IM_*, CPP_CPU_*, CPP_CPU_SPEC): New.
(EXTRA_SPECS, SUBTARGET_EXTRA_SPECS): New.
* alpha/elf.h (LD_SPEC): Use %(elf_dynamic_linker).
* alpha/linux-elf.h (SUBTARGET_EXTRA_SPECS): New.
(LIB_SPEC): Tidy.
* alpha/linux.h (CPP_PREDEFINES): Tidy.
* alpha/netbsd-elf.h (SUBTARGET_EXTRA_SPECS): New.
* alpha/netbsd.h (CPP_PREDEFINES): Tidy.
* alpha/osf.h (CPP_PREDEFINES): Remove bits subsumed by CPP_CPU_SPEC.
* alpha/win-nt.h (CPP_PREDEFINES): Likewise.
* alpha/vsf.h (CPP_PREDEFINES): Likewise.
(CPP_SUBTARGET_SPEC): New. Do this instead of overriding CPP_SPEC.
* alpha/vxworks.h: Likewise.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@21311
138bc75d-0d04-0410-961f-
82ee72b054a4