[Bug libc/29132] New: If <stdc-predef.h> is not preincluded, then #define __STDC_xxx violate C11 6.10.8

["pavel.morozkin at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29132

            Bug ID: 29132
           Summary: If <stdc-predef.h> is not preincluded, then #define
                    __STDC_xxx violate C11 6.10.8
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: pavel.morozkin at gmail dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

If <stdc-predef.h> is not preincluded, then #define __STDC_xxx violate C11
6.10.8.

In GCC the <stdc-predef.h> is preincluded => OK.
In Clang the <stdc-predef.h> is not preincluded => not OK (see
https://github.com/llvm/llvm-project/issues/53132).

Relevant quotes:
C11, 6.10.8 Predefined macro names:
> None of these macro names, nor the identifier defined, shall be the subject of a
> #define or a #undef preprocessing directive.
> The values of the predefined macros listed in the following subclauses176) (except for
> _ _FILE_ _ and _ _LINE_ _) remain constant throughout the translation unit.

Consider fixing.

-- 
You are receiving this mail because:
You are on the CC list for the bug.