From 5ee69670071f583bdffe2718dc46763fa1698f92 Mon Sep 17 00:00:00 2001
From: Colin <colin@uninsane.org>
Date: Mon, 7 Aug 2023 07:29:03 +0000
Subject: [PATCH 1/2] gtk3: compile schemas even when cross compiling

without this applications won't locate gtk3's schemas even if they're on
XDG_DATA_DIRS. this patch solves runtime errors of the form:
```
Settings schema 'org.gtk.Settings.FileChooser' is not installed
```
---
 pkgs/development/libraries/gtk/3.x.nix | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/libraries/gtk/3.x.nix b/pkgs/development/libraries/gtk/3.x.nix
index a527faf5a8be..792f305a83ba 100644
--- a/pkgs/development/libraries/gtk/3.x.nix
+++ b/pkgs/development/libraries/gtk/3.x.nix
@@ -24,6 +24,7 @@
 , gobject-introspection
 , buildPackages
 , withIntrospection ? stdenv.hostPlatform.emulatorAvailable buildPackages
+, compileSchemas ? stdenv.hostPlatform.emulatorAvailable buildPackages
 , fribidi
 , xorg
 , libepoxy
@@ -110,7 +111,7 @@ stdenv.mkDerivation (finalAttrs: {
     gtk-doc
     # For xmllint
     libxml2
-  ] ++ lib.optionals (withIntrospection && !stdenv.buildPlatform.canExecute stdenv.hostPlatform) [
+  ] ++ lib.optionals ((withIntrospection || compileSchemas) && !stdenv.buildPlatform.canExecute stdenv.hostPlatform) [
     mesonEmulatorHook
   ] ++ lib.optionals waylandSupport [
     wayland-scanner
@@ -183,6 +184,10 @@ stdenv.mkDerivation (finalAttrs: {
     substituteInPlace meson.build \
       --replace "x11_enabled = false" ""
 
+    # this conditional gates the installation of share/gsettings-schemas/.../glib-2.0/schemas/gschemas.compiled.
+    substituteInPlace meson.build \
+      --replace 'if not meson.is_cross_build()' 'if ${lib.boolToString compileSchemas}'
+
     files=(
       build-aux/meson/post-install.py
       demos/gtk-demo/geninclude.py

From 7a1c5e3a5d1ff82c8afa659c7f903d5309d5de6a Mon Sep 17 00:00:00 2001
From: Colin <colin@uninsane.org>
Date: Mon, 7 Aug 2023 07:50:25 +0000
Subject: [PATCH 2/2] gtk4: compile schemas even when cross compiling

---
 pkgs/development/libraries/gtk/4.x.nix | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/pkgs/development/libraries/gtk/4.x.nix b/pkgs/development/libraries/gtk/4.x.nix
index b7e8c13ccca6..0503ac199f90 100644
--- a/pkgs/development/libraries/gtk/4.x.nix
+++ b/pkgs/development/libraries/gtk/4.x.nix
@@ -1,5 +1,6 @@
 { lib
 , stdenv
+, buildPackages
 , substituteAll
 , fetchurl
 , pkg-config
@@ -7,6 +8,7 @@
 , graphene
 , gi-docgen
 , meson
+, mesonEmulatorHook
 , ninja
 , python3
 , makeWrapper
@@ -45,6 +47,7 @@
 , wayland-scanner
 , xineramaSupport ? stdenv.isLinux
 , cupsSupport ? stdenv.isLinux
+, compileSchemas ? stdenv.hostPlatform.emulatorAvailable buildPackages
 , cups
 , AppKit
 , Cocoa
@@ -99,6 +102,8 @@ stdenv.mkDerivation rec {
     sassc
     gi-docgen
     libxml2 # for xmllint
+  ] ++ lib.optionals (compileSchemas && !stdenv.buildPlatform.canExecute stdenv.hostPlatform) [
+    mesonEmulatorHook
   ] ++ lib.optionals waylandSupport [
     wayland-scanner
   ] ++ setupHooks;
@@ -190,6 +195,10 @@ stdenv.mkDerivation rec {
   };
 
   postPatch = ''
+    # this conditional gates the installation of share/gsettings-schemas/.../glib-2.0/schemas/gschemas.compiled.
+    substituteInPlace meson.build \
+      --replace 'if not meson.is_cross_build()' 'if ${lib.boolToString compileSchemas}'
+
     files=(
       build-aux/meson/gen-demo-header.py
       demos/gtk-demo/geninclude.py