[Bug libc/10110] New: Separate __STDC_* predefines from features.h

["jsm28 at gcc dot gnu dot org" <sourceware-bugzilla at sourceware dot org>]

To support implementing the C99 requirement that the __STDC_* predefined
macros are constant throughout the translation unit (not undefined before
system headers are included and defined afterwards), glibc should put those
such macros it defines in a standalone header included from <features.h>
that is also suitable for the compiler to preinclude by default.

A glibc patch is at <http://sourceware.org/ml/libc-alpha/2009-04/txt00001.txt>
and I'll also attach it to this PR.  Note that this patch is very simple and
it should be clear that it is safe; it's the GCC patch included with the same
message <http://sourceware.org/ml/libc-alpha/2009-04/msg00005.html> that's
the more complicated side of implementing this C99 requirement.

-- 
           Summary: Separate __STDC_* predefines from features.h
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: jsm28 at gcc dot gnu dot org
                CC: glibc-bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=10110

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