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

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Package: emacs; Reported by: MAN ONE <pRoMMMModE@HIDDEN>; Done: Eli Zaretskii <eliz@HIDDEN>; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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Date: Wed, 30 Apr 2025 14:17:27 +0300
Message-Id: <86ecx9oq48.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: MAN ONE <pRoMMMModE@HIDDEN>
In-Reply-To: <SY7P300MB103434A44895B44F71E2FDB7DF832@HIDDEN>
 (message from MAN ONE on Wed, 30 Apr 2025 11:02:26 +0000)
Subject: Re: bug#78160: Emacs fail to build with GCC 15
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> From: MAN ONE <pRoMMMModE@HIDDEN>
> 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.
Notification sent to MAN ONE <pRoMMMModE@HIDDEN>:
bug acknowledged by developer. Full text available.
Reply sent to Eli Zaretskii <eliz@HIDDEN>:
You have taken responsibility. Full text available.

Message received at 78160 <at> debbugs.gnu.org:


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Date: Wed, 30 Apr 2025 13:05:51 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
To: MAN ONE <pRoMMMModE@HIDDEN>
In-Reply-To: <SY7P300MB10349362AFD0A5F0F4311884DF832@HIDDEN>
 (message from MAN ONE on Wed, 30 Apr 2025 09:23:51 +0000)
Subject: Re: bug#78160: Emacs fail to build with GCC 15
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> From: MAN ONE <pRoMMMModE@HIDDEN>
> CC: "78160 <at> debbugs.gnu.org" <78160 <at> debbugs.gnu.org>
> Date: Wed, 30 Apr 2025 09:23:51 +0000
> msip_labels:
> 
> Thanks, the patch solved the compilation error, and the compiled binary seems working fine.
> However GCC also output some warnings ( actually GCC output a LOT of warnings, I just gonna paste warnings that only relate to the patch.)
> 
> make[2]: Entering directory '/e/home/repo/emacs/lib-src'
>   CC       ntlib.o
>   CCLD     etags.exe
>   CCLD     emacsclient.exe
> emacsclient.c: In function 'w32_give_focus':
> emacsclient.c:1801:17: warning: cast between incompatible function types from 'FARPROC' {a
> ka 'long long int (*)(void)'} to 'BOOL (*)(DWORD)' {aka 'int (*)(long unsigned int)'} [-Wc
> ast-function-type]
>  1801 |   if ((set_fg = (AllowSetForegroundWindow_proc) GetProcAddress (user32, "AllowSetF
> oregroundWindow"))
>       |                 ^
> emacsclient.c:1802:20: warning: cast between incompatible function types from 'FARPROC' {a
> ka 'long long int (*)(void)'} to 'UINT (*)(struct HWND__ *, CHAR *, UINT)' {aka 'unsigned
> int (*)(struct HWND__ *, char *, unsigned int)'} [-Wcast-function-type]
>  1802 |       && (get_wc = (RealGetWindowClassA_proc) GetProcAddress (user32, "RealGetWind
> owClassA")))
>       |                    ^
>   RC       emacsclient.res
>   CCLD     emacsclientw.exe
> emacsclient.c: In function 'w32_give_focus':
> emacsclient.c:1801:17: warning: cast between incompatible function types from 'FARPROC' {a
> ka 'long long int (*)(void)'} to 'BOOL (*)(DWORD)' {aka 'int (*)(long unsigned int)'} [-Wc
> ast-function-type]
>  1801 |   if ((set_fg = (AllowSetForegroundWindow_proc) GetProcAddress (user32, "AllowSetF
> oregroundWindow"))
>       |                 ^
> emacsclient.c:1802:20: warning: cast between incompatible function types from 'FARPROC' {a
> ka 'long long int (*)(void)'} to 'UINT (*)(struct HWND__ *, CHAR *, UINT)' {aka 'unsigned
> int (*)(struct HWND__ *, char *, unsigned int)'} [-Wcast-function-type]
>  1802 |       && (get_wc = (RealGetWindowClassA_proc) GetProcAddress (user32, "RealGetWind
> owClassA")))
>       |                    ^

Please try the below patch instead of the previous one:

diff --git a/lib-src/emacsclient.c b/lib-src/emacsclient.c
index 2cf90f4..ddfe19f 100644
--- a/lib-src/emacsclient.c
+++ b/lib-src/emacsclient.c
@@ -1715,8 +1715,13 @@ set_socket (bool no_exit_if_error)
 }
 
 #ifdef HAVE_NTGUI
-FARPROC set_fg;  /* Pointer to AllowSetForegroundWindow.  */
-FARPROC get_wc;  /* Pointer to RealGetWindowClassA.  */
+typedef void (* VOIDFNPTR) (void);
+typedef BOOL (WINAPI *AllowSetForegroundWindow_proc) (DWORD);
+/* Pointer to AllowSetForegroundWindow.  */
+static AllowSetForegroundWindow_proc set_fg;
+typedef UINT (WINAPI *RealGetWindowClassA_proc) (HWND, LPSTR, UINT);
+/* Pointer to RealGetWindowClassA.  */
+static RealGetWindowClassA_proc get_wc;
 
 void w32_set_user_model_id (void);
 
@@ -1794,8 +1799,8 @@ w32_give_focus (void)
      emacsclient can allow Emacs to grab the focus by calling the function
      AllowSetForegroundWindow.  Unfortunately, older Windows (W95, W98 and
      NT) lack this function, so we have to check its availability.  */
-  if ((set_fg = GetProcAddress (user32, "AllowSetForegroundWindow"))
-      && (get_wc = GetProcAddress (user32, "RealGetWindowClassA")))
+  if ((set_fg = (AllowSetForegroundWindow_proc) (VOIDFNPTR) GetProcAddress (user32, "AllowSetForegroundWindow"))
+      && (get_wc = (RealGetWindowClassA_proc) (VOIDFNPTR) GetProcAddress (user32, "RealGetWindowClassA")))
     EnumWindows (w32_find_emacs_process, (LPARAM) 0);
 }
 #endif /* HAVE_NTGUI */
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78160; Package emacs. Full text available.

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Date: Wed, 30 Apr 2025 11:15:26 +0300
Message-Id: <86o6wenjz5.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: MAN ONE <pRoMMMModE@HIDDEN>
In-Reply-To: <SY7P300MB103448970A2D5FF7EED93F6DDF832@HIDDEN>
 (message from MAN ONE on Wed, 30 Apr 2025 04:38:42 +0000)
Subject: Re: bug#78160: Emacs fail to build with GCC 15
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> From: MAN ONE <pRoMMMModE@HIDDEN>
> Date: Wed, 30 Apr 2025 04:38:42 +0000
> msip_labels: 
> 
> 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.

Thanks for the report.  Does the patch below solve these problems?

diff --git a/lib-src/emacsclient.c b/lib-src/emacsclient.c
index 2cf90f4..d783af9 100644
--- a/lib-src/emacsclient.c
+++ b/lib-src/emacsclient.c
@@ -1715,8 +1715,12 @@ set_socket (bool no_exit_if_error)
 }
 
 #ifdef HAVE_NTGUI
-FARPROC set_fg;  /* Pointer to AllowSetForegroundWindow.  */
-FARPROC get_wc;  /* Pointer to RealGetWindowClassA.  */
+typedef BOOL (WINAPI *AllowSetForegroundWindow_proc) (DWORD);
+/* Pointer to AllowSetForegroundWindow.  */
+static AllowSetForegroundWindow_proc set_fg;
+typedef UINT (WINAPI *RealGetWindowClassA_proc) (HWND, LPSTR, UINT);
+/* Pointer to RealGetWindowClassA.  */
+static RealGetWindowClassA_proc get_wc;
 
 void w32_set_user_model_id (void);
 
@@ -1794,8 +1798,8 @@ w32_give_focus (void)
      emacsclient can allow Emacs to grab the focus by calling the function
      AllowSetForegroundWindow.  Unfortunately, older Windows (W95, W98 and
      NT) lack this function, so we have to check its availability.  */
-  if ((set_fg = GetProcAddress (user32, "AllowSetForegroundWindow"))
-      && (get_wc = GetProcAddress (user32, "RealGetWindowClassA")))
+  if ((set_fg = (AllowSetForegroundWindow_proc) GetProcAddress (user32, "AllowSetForegroundWindow"))
+      && (get_wc = (RealGetWindowClassA_proc) GetProcAddress (user32, "RealGetWindowClassA")))
     EnumWindows (w32_find_emacs_process, (LPARAM) 0);
 }
 #endif /* HAVE_NTGUI */
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78160; Package emacs. Full text available.

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Subject: Emacs fail to build with GCC 15
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 Content preview:  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.  */       |         ^~~~~~ emacs [...]
    
 
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Earlier this week Msys2 upgraded GCC to version 15.1.0, which lead to this =
build error:=0A=
=0A=
=0A=
emacsclient.c:1718:9: warning: no previous declaration for 'set_fg' [-Wmiss=
ing-variable-de=0A=
clarations]=0A=
=A01718 | FARPROC set_fg; =A0/* Pointer to AllowSetForegroundWindow. =A0*/=
=0A=
=A0 =A0 =A0 | =A0 =A0 =A0 =A0 ^~~~~~=0A=
emacsclient.c:1719:9: warning: no previous declaration for 'get_wc' [-Wmiss=
ing-variable-de=0A=
clarations]=0A=
=A01719 | FARPROC get_wc; =A0/* Pointer to RealGetWindowClassA. =A0*/=0A=
=A0 =A0 =A0 | =A0 =A0 =A0 =A0 ^~~~~~=0A=
emacsclient.c: In function 'w32_find_emacs_process':=0A=
emacsclient.c:1759:9: error: too many arguments to function 'get_wc'; expec=
ted 0, have 3=0A=
=A01759 | =A0 if (! get_wc (hWnd, class, sizeof (class))=0A=
=A0 =A0 =A0 | =A0 =A0 =A0 =A0 ^~~~~~ =A0~~~~=0A=
emacsclient.c:1770:3: error: too many arguments to function 'set_fg'; expec=
ted 0, have 1=0A=
=A01770 | =A0 set_fg (emacs_pid);=0A=
=A0 =A0 =A0 | =A0 ^~~~~~ =A0~~~~~~~~~=0A=
emacsclient.c:1718:9: warning: no previous declaration for 'set_fg' [-Wmiss=
ing-variable-de=0A=
clarations]=0A=
=A01718 | FARPROC set_fg; =A0/* Pointer to AllowSetForegroundWindow. =A0*/=
=0A=
=A0 =A0 =A0 | =A0 =A0 =A0 =A0 ^~~~~~=0A=
emacsclient.c:1719:9: warning: no previous declaration for 'get_wc' [-Wmiss=
ing-variable-de=0A=
clarations]=0A=
=A01719 | FARPROC get_wc; =A0/* Pointer to RealGetWindowClassA. =A0*/=0A=
=A0 =A0 =A0 | =A0 =A0 =A0 =A0 ^~~~~~=0A=
emacsclient.c: In function 'w32_find_emacs_process':=0A=
emacsclient.c:1759:9: error: too many arguments to function 'get_wc'; expec=
ted 0, have 3=0A=
=A01759 | =A0 if (! get_wc (hWnd, class, sizeof (class))=0A=
=A0 =A0 =A0 | =A0 =A0 =A0 =A0 ^~~~~~ =A0~~~~=0A=
emacsclient.c:1770:3: error: too many arguments to function 'set_fg'; expec=
ted 0, have 1=0A=
=A01770 | =A0 set_fg (emacs_pid);=0A=
=A0 =A0 =A0 | =A0 ^~~~~~ =A0~~~~~~~~~=0A=
make[2]: *** [Makefile:446: emacsclientw.exe] Error 1=0A=
make[2]: *** Waiting for unfinished jobs....=0A=
make[2]: *** [Makefile:439: emacsclient.exe] Error 1=0A=
make[2]: Leaving directory '/e/home/repo/emacs/lib-src'=0A=
make[1]: *** [Makefile:529: lib-src] Error 2=0A=
make[1]: *** Waiting for unfinished jobs....=0A=
=0A=
=0A=
I think the cause is GCC 15 now use C23 by default[1], and appending ` -std=
=3Dgnu17 ` compiler flag does solve the problem.=0A=
=0A=
[1]https://gcc.gnu.org/gcc-15/porting_to.html#c23=
Acknowledgement sent to MAN ONE <pRoMMMModE@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#78160; Package emacs. Full text available.
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