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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/48996] fixincl on Red Hat EL 5 breaks sys/stat.h fstat64()
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48996

--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-05-16 13:07:56 UTC ---
I don't see anything wrong with the fixinclude though it is a bit fragile
as it wants to fixup both prototype and redicrected inline function and
both are not guarded with the same #ifdefs:


#ifdef __USE_LARGEFILE64
extern int stat64 (__const char *__restrict __file,
                   struct stat64 *__restrict __buf) __THROW __nonnull ((1, 2));
extern int fstat64 (int __fd, struct stat64 *__buf) __THROW __nonnull ((2));
#endif

but

# if defined __USE_LARGEFILE64 \
  && (! defined __USE_FILE_OFFSET64 \
      || (defined __REDIRECT_NTH && defined __OPTIMIZE__))
extern __inline__ int
__NTH (fstat64 (int __fd, struct stat64 *__statbuf))
{
  return __fxstat64 (_STAT_VER, __fd, __statbuf);
}
...

so if only the fixed fstat64 prototype remains after preprocessing that
will trigger the error you saw.

So, do you have a testcase that fails to build?  And which flags do
you pass?