build: Depend on gtk main for GdkGLTextureBuilder

- Add a meson subproject for building main gtk
- Adapt the docs CI job to install the necessary build deps
- Disable werror in the CI for now, until we port aways from deprecated
APIs
- Switch from using add_global_argument as it would affect subprojects

# Conflicts:
#	.gitignore

.gitignore

@@ -1,3 +1,6 @@
 .flatpak
 .flatpak-builder
 .vscode
+subprojects/gtk
+subprojects/libsass
+subprojects/sassc

.gitlab-ci.yml

@@ -21,9 +21,9 @@ reference:
   stage: docs
   needs: []
   variables:
-    MESON_FLAGS: "-Dwerror=true --buildtype=release"
+    MESON_FLAGS: "--buildtype=release -Dgtk:gtk_doc=false -Dgtk:introspection=disabled -Dgtk:build-examples=false -Dgtk:build-tests=false -Dgtk:demos=false -Dgtk:media-gstreamer=disabled -Dlibepoxy:tests=false"
   before_script:
-    - sudo dnf install -y gtk4-devel meson gcc gi-docgen gobject-introspection-devel vala
+    - sudo dnf install -y git gtk4-devel meson gcc gcc-c++ gi-docgen gobject-introspection-devel vala
   script:
     - mkdir -p pfx/
     - meson ${MESON_FLAGS} --prefix=${PWD}/pfx -Ddocs=true _build

meson.build

@@ -23,7 +23,7 @@ add_project_arguments(['-I' + meson.project_build_root()], language: 'c')
 
 # Check dependencies
 glib_req_version = '2.75.0'
-gtk_req_version = '4.8'
+gtk_req_version = '4.11'
 
 glib_req = '>= @0@'.format(glib_req_version)
 gtk_req = '>= @0@'.format(gtk_req_version)
@@ -43,7 +43,7 @@ endif
 libepoxy_dep = dependency('epoxy')
 libgio_dep = dependency('gio-2.0', version: glib_req)
 libgiounix_dep = dependency('gio-unix-2.0', version: glib_req)
-libgtk_dep = dependency('gtk4', version: gtk_req)
+libgtk_dep = dependency('gtk4', version: gtk_req, fallback: ['gtk'])
 
 # Ensure we restrict ABI usage to what we claim
 project_c_args += [
@@ -141,7 +141,7 @@ test_link_args = [
   '-Wl,-z,now',
 ]
 if not get_option('buildtype').startswith('debug') and not meson.is_subproject()
-  add_global_arguments(['-DG_DISABLE_CAST_CHECKS'], language: 'c')
+  add_project_arguments(['-DG_DISABLE_CAST_CHECKS'], language: 'c')
   release_args += [ '-DG_DISABLE_ASSERT' ]
   test_link_args += [
     '-Wl,-Bsymbolic',

subprojects/gtk.wrap

@@ -0,0 +1,10 @@
+[wrap-git]
+directory=gtk
+url=https://gitlab.gnome.org/GNOME/gtk.git
+push-url=ssh://git@gitlab.gnome.org:GNOME/gtk.git
+revision=main
+depth=1
+
+[provide]
+gtk4=libgtk_dep
+dependency_names=gtk4