[Bug build/18755] New: build errors with -DNDEBUG

["msebor at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18755

            Bug ID: 18755
           Summary: build errors with -DNDEBUG
           Product: glibc
           Version: 2.21
            Status: NEW
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: msebor at redhat dot com
                CC: carlos at redhat dot com
  Target Milestone: ---

The top of trunk (commit fddb87425a25aeb6e937496c4952c9bf3d8bb673) fails to
build when the NDEBUG macro is defined due to the following errors:

$ grep "error: " make.log  | grep -v "No such " | sort -u
../iconv/skeleton.c:678:16: error: variable ‘nstatus’ set but not used
[-Werror=unused-but-set-variable]
nscd.c:662:11: error: unused variable ‘ret’ [-Werror=unused-variable]
nscd.c:694:7: error: unused variable ‘ret’ [-Werror=unused-variable]
../sysdeps/nptl/gai_misc.h:108:7: error: variable ‘sigerr’ set but not used
[-Werror=unused-but-set-variable]
../sysdeps/nptl/gai_misc.h:84:7: error: unused variable ‘sigerr’
[-Werror=unused-variable]

A simple patch was posted here:
https://sourceware.org/ml/libc-alpha/2015-07/msg00507.html

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From: "msebor at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug stdio/18756] New: fmemopen succeeds when size is zero
Date: Sat, 01 Aug 2015 18:16:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id\x18756

            Bug ID: 18756
           Summary: fmemopen succeeds when size is zero
           Product: glibc
           Version: 2.21
            Status: NEW
          Severity: normal
          Priority: P2
         Component: stdio
          Assignee: unassigned at sourceware dot org
          Reporter: msebor at redhat dot com
  Target Milestone: ---

POSIX specifies the fmemopen() function shall fail with EINVAL when the size
argument specifies a buffer size of zero. When compiled with the top of trunk,
the program below aborts indicating that glibc fails to conform to this
requirement.

#include <assert.h>
#include <errno.h>
#include <stdio.h>

int main (void)
{
    char c = 0;
    FILE *f = fmemopen (&c, 0, "w");
    printf ("%p, errno = %m\n", f);
    assert (f == 0 && errno == EINVAL);
    return 0;
}
0x100002f0040, errno = Success
a.out: /build/tmp/t.c:10: main: Assertion `f == 0 && (*__errno_location ()) =22' failed.

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