GNU bug report logs - #78160
Emacs fail to build with GCC 15

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#78160: closed (Emacs fail to build with GCC 15)
Date: Wed, 30 Apr 2025 11:18:01 +0000

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Your message dated Wed, 30 Apr 2025 14:17:27 +0300
with message-id <86ecx9oq48.fsf <at> gnu.org>
and subject line Re: bug#78160: Emacs fail to build with GCC 15
has caused the debbugs.gnu.org bug report #78160,
regarding Emacs fail to build with GCC 15
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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78160: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=78160
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From: MAN ONE <pRoMMMModE <at> outlook.com>
To: "bug-gnu-emacs <at> gnu.org" <bug-gnu-emacs <at> gnu.org>
Subject: Emacs fail to build with GCC 15
Date: Wed, 30 Apr 2025 04:38:42 +0000

Earlier this week Msys2 upgraded GCC to version 15.1.0, which lead to this build error:


emacsclient.c:1718:9: warning: no previous declaration for 'set_fg' [-Wmissing-variable-de
clarations]
 1718 | FARPROC set_fg;  /* Pointer to AllowSetForegroundWindow.  */
      |         ^~~~~~
emacsclient.c:1719:9: warning: no previous declaration for 'get_wc' [-Wmissing-variable-de
clarations]
 1719 | FARPROC get_wc;  /* Pointer to RealGetWindowClassA.  */
      |         ^~~~~~
emacsclient.c: In function 'w32_find_emacs_process':
emacsclient.c:1759:9: error: too many arguments to function 'get_wc'; expected 0, have 3
 1759 |   if (! get_wc (hWnd, class, sizeof (class))
      |         ^~~~~~  ~~~~
emacsclient.c:1770:3: error: too many arguments to function 'set_fg'; expected 0, have 1
 1770 |   set_fg (emacs_pid);
      |   ^~~~~~  ~~~~~~~~~
emacsclient.c:1718:9: warning: no previous declaration for 'set_fg' [-Wmissing-variable-de
clarations]
 1718 | FARPROC set_fg;  /* Pointer to AllowSetForegroundWindow.  */
      |         ^~~~~~
emacsclient.c:1719:9: warning: no previous declaration for 'get_wc' [-Wmissing-variable-de
clarations]
 1719 | FARPROC get_wc;  /* Pointer to RealGetWindowClassA.  */
      |         ^~~~~~
emacsclient.c: In function 'w32_find_emacs_process':
emacsclient.c:1759:9: error: too many arguments to function 'get_wc'; expected 0, have 3
 1759 |   if (! get_wc (hWnd, class, sizeof (class))
      |         ^~~~~~  ~~~~
emacsclient.c:1770:3: error: too many arguments to function 'set_fg'; expected 0, have 1
 1770 |   set_fg (emacs_pid);
      |   ^~~~~~  ~~~~~~~~~
make[2]: *** [Makefile:446: emacsclientw.exe] Error 1
make[2]: *** Waiting for unfinished jobs....
make[2]: *** [Makefile:439: emacsclient.exe] Error 1
make[2]: Leaving directory '/e/home/repo/emacs/lib-src'
make[1]: *** [Makefile:529: lib-src] Error 2
make[1]: *** Waiting for unfinished jobs....


I think the cause is GCC 15 now use C23 by default[1], and appending ` -std=gnu17 ` compiler flag does solve the problem.

[1]https://gcc.gnu.org/gcc-15/porting_to.html#c23

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From: Eli Zaretskii <eliz <at> gnu.org>
To: MAN ONE <pRoMMMModE <at> outlook.com>
Cc: 78160-done <at> debbugs.gnu.org
Subject: Re: bug#78160: Emacs fail to build with GCC 15
Date: Wed, 30 Apr 2025 14:17:27 +0300

> From: MAN ONE <pRoMMMModE <at> outlook.com>
> CC: "78160 <at> debbugs.gnu.org" <78160 <at> debbugs.gnu.org>
> Date: Wed, 30 Apr 2025 11:02:26 +0000
> msip_labels:
> 
> The second patch produce no compilation error or warnings, emacsclient.exe and emacsclientw.exe also working, I think the second patch does the trick.

Thanks, installed on both the emacs-30 and the master branch, and
closing this bug.

As for the other warnings, feel free to submit a separate bug report
with them, so we could consider how and on which branch to fix them.

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