[Bug build/33089] New: [2.42 Regression] GCC 14.2.1 failed to build glibc

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=33089

            Bug ID: 33089
           Summary: [2.42 Regression] GCC 14.2.1 failed to build glibc
           Product: glibc
           Version: 2.42
            Status: NEW
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
                CC: carlos at redhat dot com
  Target Milestone: ---
            Target: x86-64

On x86-64, when GCC 14.2.1 is used to build:

commit f3c82fc1b41261f582f5f9fa12f74af9bcbc88f9
Author: Radko Krkos <krkos@mail.muni.cz>
Date:   Sat Jun 14 11:07:40 2025 +0200

    io: Mark lockf() __wur [BZ #32800]

    In commit 0476597b28 flock() was marked __wur in posix/unistd.h, but not
    in io/fcntl.h, the declarations must match.

    Reviewed-by: Florian Weimer <fweimer@redhat.com>

I got

programs/locarchive.c: In function ‘open_archive’:
programs/locarchive.c:641:18: error: ignoring return value of ‘lockf64’
declared with attribute ‘warn_unused_result’ [-Werror=unused-result]
  641 |           (void) lockf64 (fd, F_ULOCK, sizeof (struct locarhead));
      |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
programs/locarchive.c:653:14: error: ignoring return value of ‘lockf64’
declared with attribute ‘warn_unused_result’ [-Werror=unused-result]
  653 |       (void) lockf64 (fd, F_ULOCK, sizeof (struct locarhead));
      |              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
programs/locarchive.c:660:14: error: ignoring return value of ‘lockf64’
declared with attribute ‘warn_unused_result’ [-Werror=unused-result]
  660 |       (void) lockf64 (fd, F_ULOCK, sizeof (struct locarhead));
      |              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
programs/locarchive.c:679:14: error: ignoring return value of ‘lockf64’
declared with attribute ‘warn_unused_result’ [-Werror=unused-result]
  679 |       (void) lockf64 (fd, F_ULOCK, sizeof (struct locarhead));
      |              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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