preprocess mips64 asm/unistd.h

[Alexandre Oliva]

The mips64 kernel header unistd.h defines macros __NR_<syscall> for
N64, __NR_N32_<syscall> or N32 and __NR_O32_<syscall>.  This is not
suitable for use in glibc for two reasons: (i) glibc only tests for
__NR_<syscall> in a number of files, and (ii) we can't just arrange to
define __NR_<syscall> to __NR_<abi>_<syscall> because this might give
false positives in case a syscall is defined on N64 but not for the
ABI in effect.  The solution is to preprocess asm/unistd.h into a
header that defines not only __NR_<abi>_<syscall>, but also
__NR_<syscall> if <abi> is in effect.  We might just drop __NR_<abi>_
entirely if we didn't actually test for __NR_<abi>_<syscall> in
certain cases, and if we didn't use this processed header to build a
single syscall list containing not only SYS_<syscall>, but also
SYS_<abi>_<syscall>.  This enables us to have a single /usr/include
tree containing headers that work for all 3 ABIs.  Ok?

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-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                 aoliva@{redhat.com, gcc.gnu.org}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist                Professional serial bug killer