[Bug libc/21242] New: assert gives pedantic warning in old gcc versions

["jzb0012 at auburn dot edu" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21242

            Bug ID: 21242
           Summary: assert gives pedantic warning in old gcc versions
           Product: glibc
           Version: 2.25
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: jzb0012 at auburn dot edu
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Created attachment 9892
  --> https://sourceware.org/bugzilla/attachment.cgi?id=9892&action=edit
patch

The braced-group version of the assert macro introduced in commit e077349ce589
causes a warning in old versions of `gcc -pedantic` (without -ansi). This
warning also occurs in the latest clang. Patch attached.

main.c:
#include <assert.h>
int main() { assert(1); }

Without patched assert.h:

$ gcc-4.8 -pedantic main.c
$ gcc-4.4 -pedantic main.c
main.c: In function ‘main’:
main.c:2: warning: ISO C forbids braced-groups within expressions
$ clang-3.9 -pedantic main.c
main.c:2:14: warning: use of GNU statement expression extension
[-Wgnu-statement-expression]
int main() { assert(1); }
             ^
/usr/include/assert.h:95:6: note: expanded from macro 'assert'
    ({                                                                  \
     ^
1 warning generated.

With patched assert.h:

$ gcc-4.8 -pedantic main.c
$ gcc-4.4 -pedantic main.c
$ clang-3.9 -pedantic main.c

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