[Bug bootstrap/112534] [14 regression] build failure after r14-5424-gdb50aea6259545 using gcc 4.8.5

["bruno at clisp dot org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112534

Bruno Haible <bruno at clisp dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bruno at clisp dot org

--- Comment #2 from Bruno Haible <bruno at clisp dot org> ---
> gcc version 4.8.5 20150623 (Red Hat 4.8.5-44) (GCC) 
> gcc -std=gnu99 ...
> error: unknown type name 'max_align_t'

The type 'max_align_t' exists in C11, but not in C99, as can be seen from these
uses of gcc 4.8.5:
$ cat foo.c
#include <stddef.h>
max_align_t x;
$ gcc -std=c11 -c foo.c
$ gcc -std=gnu11 -c foo.c
$ gcc -std=c99 -c foo.c
foo.c:2:1: error: unknown type name ‘max_align_t’
 max_align_t x;
 ^
$ gcc -std=gnu99 -c foo.c
foo.c:2:1: error: unknown type name ‘max_align_t’
 max_align_t x;
 ^

But this occurs in the build tree of gettext-runtime, and this package uses
AC_PROG_CC, which adds option -std=gnu11 if supported (this is in GNU Autoconf
since version 2.70).

Maybe some configure file was built with Autoconf 2.69 and older and thus does
not add -std=gnu11 ?

Or some other configure in the build tree has determined CC="gcc -std=gnu99",
and this setting has been propagated into gettext-runtime, overriding the
findings from gettext-runtime/configure ?