[vim/vim] Can't compile vim with GTK 4 (Issue #20404)

[simozz]

gveezz created an issue (vim/vim#20404)

Steps to reproduce

I am trying to compile vim with GTK4 (4.18.6+ds-2 on Debian 13) with the following configuration:

export CFLAGS="-Ofast"; \
./configure \
--prefix=/usr/local/ \
--with-features=huge \
--enable-gtk4-check \
--enable-gui=gtk4 \
--enable-multibyte \
--enable-wayland \
--enable-fork \
--enable-terminal=no \
--enable-xim \
--with-tlib=ncurses \
--with-x \
--enable-fontset \
--enable-autoservername \
--disable-rightleft \
--disable-arabic \
--disable-farsi \
--enable-gpm=yes \
--enable-cscope \
--enable-year2038 \
--with-gnome-includes=/usr/include/gtk-4.0

But the compile step fails with highlight.c:

highlight.c: In function ‘highlight_set_font’:
highlight.c:1045:13: error: implicit declaration of function ‘gui_mch_free_fontset’; did you mean ‘gui_mch_free_font’? [-Wimplicit-function-declaration]
1045 | gui_mch_free_fontset(temp_sg_fontset);
| ^~~~~~~~~~~~~~~~~~~~
| gui_mch_free_font
highlight.c: In function ‘fontset_name2handle’:
highlight.c:2410:12: error: implicit declaration of function ‘gui_mch_get_fontset’; did you mean ‘gui_mch_get_font’? [-Wimplicit-function-declaration]
2410 | return gui_mch_get_fontset(name, TRUE, fixed_width);
| ^~~~~~~~~~~~~~~~~~~
| gui_mch_get_font
highlight.c:2410:12: error: returning ‘int’ from a function with return type ‘GuiFontset’ {aka ‘struct _PangoFontDescription *’} makes pointer from integer without a cast [-Wint-conversion]
2410 | return gui_mch_get_fontset(name, TRUE, fixed_width);

Compiling for GTK 3 has no problem.

Expected behaviour

Compile vim gtk without errors

Version of Vim

v9.2.0580

Environment

Linux Debian 13
BSH

Logs and stack traces

highlight.c: In function ‘highlight_set_font’:
highlight.c:1045:13: error: implicit declaration of function ‘gui_mch_free_fontset’; did you mean ‘gui_mch_free_font’? [-Wimplicit-function-declaration]
 1045 |             gui_mch_free_fontset(temp_sg_fontset);
      |             ^~~~~~~~~~~~~~~~~~~~
      |             gui_mch_free_font
highlight.c: In function ‘fontset_name2handle’:
highlight.c:2410:12: error: implicit declaration of function ‘gui_mch_get_fontset’; did you mean ‘gui_mch_get_font’? [-Wimplicit-function-declaration]
 2410 |     return gui_mch_get_fontset(name, TRUE, fixed_width);
      |            ^~~~~~~~~~~~~~~~~~~
      |            gui_mch_get_font
highlight.c:2410:12: error: returning ‘int’ from a function with return type ‘GuiFontset’ {aka ‘struct _PangoFontDescription *’} makes pointer from integer without a cast [-Wint-conversion]
 2410 |     return gui_mch_get_fontset(name, TRUE, fixed_width);
``

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