libiberty requirements and ISO C90

[Mark Kettenis]

   From: Ian Lance Taylor <ian@airs.com>
   Date: 15 May 2005 23:20:14 -0400


   Well, we require an ISO C90 compiler; do we require ISO C90 libraries?
   If we require the libraries, then we can remove a number of files from
   libiberty, at least atexit.c, memchr.c, memcmp.c, memcpy.c, memmove.c,
   memset.c, snprintf.c, strchr.c, strerror.c, strncmp.c, strrchr.c,
   strtol.c, strtoul.c, vfprintf.c, vsprintf.c.  If we don't require the
   libraries, then we can't assume that <string.h> declares strerror.  In
   fact, technically we can't even assume that <string.h> exists,
   although we do currently have a few cases where it is included without
   being protected by #ifdef HAVE_STRING_H.

Hmm, it seems that snprintf() wasn't in ISO C90 since it's mentioned
as a new addition in ISO C99 according to google.  At least HP-UX
10.20 doesn't have it.  And GDB still builds on vax-dec-ultrix4.0 for
which I'm not sure that it has a full ISO C90 library.  So I hope
you're not seriously proposing to remove these functions from
libiberty.

Mark