wayland-scanner: split from wayland

We've used a wayland-scanner = wayland.bin alias for ages, to make
packages clearer and allow them to be independently overridden.
Going the whole way into splitting them into separate packages is
useful because it means we can have different meta.platforms
attributes for libwayland and wayland-scanner.

There is no duplication in outputs between the two packages — they
don't install any files in common.

Since we're no longer pulling just one output into nativeBuildInputs
of packages using wayland-scanner, we can use upstream's
wayland-scanner.pc, which gets installed into the dev output, rather
than providing our own.

pkgs/applications/window-managers/owl/default.nix

@@ -9,8 +9,6 @@
 , darwin
 }:
 
-assert wayland.withLibraries;
-
 let
   stdenv = clangStdenv;
 in

pkgs/development/libraries/wayland/default.nix

@@ -5,13 +5,10 @@
 , pkg-config
 , ninja
 , wayland-scanner
-, expat
-, libxml2
-, withLibraries ? stdenv.isLinux || stdenv.isDarwin
 , withTests ? stdenv.isLinux
 , libffi
 , epoll-shim
-, withDocumentation ? withLibraries && stdenv.hostPlatform == stdenv.buildPlatform
+, withDocumentation ? stdenv.hostPlatform == stdenv.buildPlatform
 , graphviz-nox
 , doxygen
 , libxslt
@@ -23,15 +20,6 @@
 , testers
 }:
 
-# Documentation is only built when building libraries.
-assert withDocumentation -> withLibraries;
-
-# Tests are only built when building libraries.
-assert withTests -> withLibraries;
-
-let
-  isCross = stdenv.buildPlatform != stdenv.hostPlatform;
-in
 stdenv.mkDerivation (finalAttrs: {
   pname = "wayland";
   version = "1.23.0";
@@ -53,13 +41,13 @@ stdenv.mkDerivation (finalAttrs: {
     sed -i '/os-wrappers-test/d' tests/meson.build
   '';
 
-  outputs = [ "out" "bin" "dev" ] ++ lib.optionals withDocumentation [ "doc" "man" ];
+  outputs = [ "out" "dev" ] ++ lib.optionals withDocumentation [ "doc" "man" ];
   separateDebugInfo = true;
 
   mesonFlags = [
-    "-Ddocumentation=${lib.boolToString withDocumentation}"
-    "-Dlibraries=${lib.boolToString withLibraries}"
-    "-Dtests=${lib.boolToString withTests}"
+    (lib.mesonBool "documentation" withDocumentation)
+    (lib.mesonBool "tests" withTests)
+    (lib.mesonBool "scanner" false) # wayland-scanner is a separate derivation
   ];
 
   depsBuildBuild = [
@@ -70,7 +58,6 @@ stdenv.mkDerivation (finalAttrs: {
     meson
     pkg-config
     ninja
-  ] ++ lib.optionals isCross [
     wayland-scanner
   ] ++ lib.optionals withDocumentation [
     (graphviz-nox.override { pango = null; }) # To avoid an infinite recursion
@@ -83,11 +70,8 @@ stdenv.mkDerivation (finalAttrs: {
   ];
 
   buildInputs = [
-    expat
-    libxml2
-  ] ++ lib.optionals withLibraries [
     libffi
-  ] ++ lib.optionals (withLibraries && !stdenv.hostPlatform.isLinux) [
+  ] ++ lib.optionals (!stdenv.hostPlatform.isLinux) [
     epoll-shim
   ] ++ lib.optionals withDocumentation [
     docbook_xsl
@@ -95,20 +79,7 @@ stdenv.mkDerivation (finalAttrs: {
     docbook_xml_dtd_42
   ];
 
-  postFixup = ''
-    # The pkg-config file is required for cross-compilation:
-    mkdir -p $bin/lib/pkgconfig/
-    cat <<EOF > $bin/lib/pkgconfig/wayland-scanner.pc
-    wayland_scanner=$bin/bin/wayland-scanner
-
-    Name: Wayland Scanner
-    Description: Wayland scanner
-    Version: ${finalAttrs.version}
-    EOF
-  '';
-
   passthru = {
-    inherit withLibraries;
     tests.pkg-config = testers.hasPkgConfigModules {
       package = finalAttrs.finalPackage;
     };
@@ -130,8 +101,6 @@ stdenv.mkDerivation (finalAttrs: {
     platforms = platforms.unix;
     maintainers = with maintainers; [ primeos codyopel qyliss ];
     pkgConfigModules = [
-      "wayland-scanner"
-    ] ++ lib.optionals withLibraries [
       "wayland-client"
       "wayland-cursor"
       "wayland-egl"

pkgs/development/libraries/wayland/protocols.nix

@@ -8,8 +8,9 @@ stdenv.mkDerivation rec {
   pname = "wayland-protocols";
   version = "1.36";
 
+  doCheck = stdenv.hostPlatform == stdenv.buildPlatform &&
   # https://gitlab.freedesktop.org/wayland/wayland-protocols/-/issues/48
-  doCheck = stdenv.hostPlatform == stdenv.buildPlatform && stdenv.hostPlatform.linker == "bfd" && wayland.withLibraries;
+  stdenv.hostPlatform.linker == "bfd" && lib.meta.availableOn stdenv.hostPlatform wayland;
 
   src = fetchurl {
     url = "https://gitlab.freedesktop.org/wayland/${pname}/-/releases/${version}/downloads/${pname}-${version}.tar.xz";
@@ -22,7 +23,8 @@ stdenv.mkDerivation rec {
 
   depsBuildBuild = [ pkg-config ];
   nativeBuildInputs = [ meson ninja wayland-scanner ];
-  nativeCheckInputs = [ python3 wayland ];
+  nativeCheckInputs = [ python3 ];
+  checkInputs = [ wayland ];
 
   mesonFlags = [ "-Dtests=${lib.boolToString doCheck}" ];
 

pkgs/development/libraries/wayland/scanner.nix

@@ -0,0 +1,48 @@
+{
+  lib,
+  stdenv,
+  wayland,
+  meson,
+  pkg-config,
+  ninja,
+  wayland-scanner,
+  expat,
+  libxml2,
+}:
+
+stdenv.mkDerivation {
+  pname = "wayland-scanner";
+  inherit (wayland) version src;
+
+  outputs = [
+    "out"
+    "bin"
+    "dev"
+  ];
+  separateDebugInfo = true;
+
+  mesonFlags = [
+    (lib.mesonBool "documentation" false)
+    (lib.mesonBool "libraries" false)
+    (lib.mesonBool "tests" false)
+  ];
+
+  depsBuildBuild = [ pkg-config ];
+
+  nativeBuildInputs = [
+    meson
+    pkg-config
+    ninja
+  ] ++ lib.optional (stdenv.hostPlatform != stdenv.buildPlatform) wayland-scanner;
+
+  buildInputs = [
+    expat
+    libxml2
+  ];
+
+  meta = with lib; {
+    inherit (wayland.meta) homepage license maintainers;
+    description = "C code generator for Wayland protocol XML files";
+    platforms = platforms.unix;
+  };
+}

pkgs/development/python-modules/pywayland/default.nix

@@ -21,7 +21,7 @@ buildPythonPackage rec {
   };
 
   depsBuildBuild = [ pkg-config ];
-  nativeBuildInputs = [ pkg-config wayland-scanner ];
+  nativeBuildInputs = [ wayland-scanner ];
   propagatedNativeBuildInputs = [ cffi ];
   buildInputs = [ wayland ];
   propagatedBuildInputs = [ cffi ];

pkgs/tools/graphics/mesa-demos/default.nix

@@ -28,8 +28,6 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-MEaj0mp7BRr3690lel8jv+sWDK1u2VIynN/x6fHtSWs=";
   };
 
-  strictDeps = true;
-
   depsBuildBuild = [
     pkg-config
   ];
@@ -57,9 +55,10 @@ stdenv.mkDerivation rec {
   ];
 
   mesonFlags = [
-    "-Dwith-system-data-files=true"
-    "-Dgles1=disabled"
-    "-Dosmesa=disabled"
+    "-Degl=${if stdenv.isDarwin then "disabled" else "auto"}"
+    (lib.mesonEnable "libdrm" (stdenv.isLinux))
+    (lib.mesonEnable "osmesa" (mesa ? osmesa))
+    (lib.mesonEnable "wayland" (lib.meta.availableOn stdenv.hostPlatform wayland))
   ];
 
   meta = with lib; {

pkgs/top-level/all-packages.nix

@@ -24271,7 +24271,7 @@ with pkgs;
   wavpack = callPackage ../development/libraries/wavpack { };
 
   wayland = darwin.apple_sdk_11_0.callPackage ../development/libraries/wayland { };
-  wayland-scanner = wayland.bin;
+  wayland-scanner = callPackage ../development/libraries/wayland/scanner.nix { };
 
   wayland-protocols = callPackage ../development/libraries/wayland/protocols.nix { };