[patch] build fix for non-native sparc builds.

[matthew green]

   > hi folks.
   > 
   > 
   > this fixes builds for non-native sparc targets.  "sol2.h" is used
   > by lots of targets, and it unconditionally includes <sys/mman.h>
   > when building _trampoline.o.  the patch below makes sure that
   > we aren't also defined(CROSS_COMPILE), which allows my sparc64-elf
   > target to build.
   
   Won't this cause cross-compilers to sparc-solaris to fail to create
   working trampolines?

not unless <sys/mman.h> does some sort of funny-rename with the
mprotect() symbol -- the code actually uses numbers not symbolic
constants... but the point is well made anyway.
   
   I think you instead want to stop sol2.h from being used when building
   a sparc64-elf toolchain.  It seems silly to do this since there's
   already a sparc/sysv4.h and a sparc/sp64-elf.h, and in fact it looks
   like sp64-elf.h spends most of its time overriding nearly everything
   that sol2.h did.


could be.  there are about a dozen sparc* targets that use sol2.h
that are probably broken like this... fixing them sounds quite
significant.  i'll look at sparc-elf and sparc64-elf sometime soon
unless someone else does.


.mrg.