gobject-introspection: use wrapper.nix for the native package too so we can propagate the dev output

during the build of i3ipc-glib with strictDeps enabled i noticed that
gobject-introspection was not being detected and it was due to
gobject-introspection path not being in the PKG_CONFIG_PATH variable

this commit makes gobject-introspection get detected when build==host

pkgs/development/libraries/gobject-introspection/default.nix

···
     rm $out/lib/libregress-1.0${stdenv.targetPlatform.extensions.sharedLibrary}
   '';
 
-  # add self to buildInputs to avoid needing to add gobject-introspection to buildInputs in addition to nativeBuildInputs
-  # builds use target-pkg-config to look for gobject-introspection instead of just looking for binaries in $PATH
-  # wrapper uses depsTargetTargetPropagated so ignore it
-  preFixup = lib.optionalString (!lib.hasSuffix "-wrapped" finalAttrs.pname) ''
-    mkdir -p $dev/nix-support
-    echo "$out" > $dev/nix-support/propagated-target-target-deps
-  '';
-
   setupHook = ./setup-hook.sh;
 
   passthru = {

pkgs/development/libraries/gobject-introspection/wrapper.nix

···
 # to build, run
 # `nix build ".#pkgsCross.aarch64-multiplatform.buildPackages.gobject-introspection"`
 
+# a comment for both depsTargetTargetPropagated's
+# add self to buildInputs to avoid needing to add gobject-introspection to buildInputs in addition to nativeBuildInputs
+# builds use target-pkg-config to look for gobject-introspection instead of just looking for binaries in $PATH
+
 let
-  # ensure that `.override` works when gobject-introspection == gobject-introspection-wrapped
+  # ensure that `.override` works
   args = builtins.removeAttrs _args [ "buildPackages" "targetPackages" "gobject-introspection-unwrapped" ];
   # passing this stdenv to `targetPackages...` breaks due to splicing not working in `.override``
   argsForTarget = builtins.removeAttrs args [ "stdenv" ];
+
+  overridenUnwrappedGir = gobject-introspection-unwrapped.override args;
+  # if we have targetPackages.gobject-introspection then propagate that
+  overridenTargetUnwrappedGir =
+    if targetPackages ? gobject-introspection-unwrapped
+    then targetPackages.gobject-introspection-unwrapped.override argsForTarget
+    else overridenUnwrappedGir;
 in
 
-(gobject-introspection-unwrapped.override args).overrideAttrs (previousAttrs: {
-  pname = "gobject-introspection-wrapped";
-  depsTargetTargetPropagated = [ gobject-introspection-unwrapped ];
-  postFixup = (previousAttrs.postFixup or "") + ''
-    mv $dev/bin/g-ir-compiler $dev/bin/.g-ir-compiler-wrapped
-    mv $dev/bin/g-ir-scanner $dev/bin/.g-ir-scanner-wrapped
+# wrap both pkgsCrossX.buildPackages.gobject-introspection and {pkgs,pkgsSomethingExecutableOnBuildSystem).buildPackages.gobject-introspection
+if (!stdenv.hostPlatform.canExecute stdenv.targetPlatform) && stdenv.targetPlatform.emulatorAvailable buildPackages
+then
+  stdenv.mkDerivation
+    (builtins.removeAttrs overridenUnwrappedGir.drvAttrs [ "name" ] # so we can get a fresh name generated from the pname
+      // {
+      pname = "gobject-introspection-wrapped";
+      passthru = overridenUnwrappedGir.passthru // {
+        unwrapped = overridenUnwrappedGir;
+      };
+      phases = [ "fixupPhase" ]; # don't remove, it is valid to set phases here.
+      dontStrip = true;
+      depsTargetTargetPropagated = [ overridenTargetUnwrappedGir ];
+      postFixup = ''
+        ${lib.concatMapStrings (output: ''
+          mkdir -p ${"$" + "${output}"}
+          ${lib.getExe buildPackages.xorg.lndir} ${gobject-introspection-unwrapped.${output}} ${"$" + "${output}"}
+        '') gobject-introspection-unwrapped.outputs}
 
-    (
-      export bash="${buildPackages.bash}"
-      export emulator=${lib.escapeShellArg (stdenv.targetPlatform.emulator buildPackages)}
-      export emulatorwrapper="$dev/bin/g-ir-scanner-qemuwrapper"
-      export buildlddtree="${buildPackages.pax-utils}/bin/lddtree"
+        cp $dev/bin/g-ir-compiler $dev/bin/.g-ir-compiler-wrapped
+        cp $dev/bin/g-ir-scanner $dev/bin/.g-ir-scanner-wrapped
 
-      export targetgir="${lib.getDev (targetPackages.gobject-introspection-unwrapped.override argsForTarget)}"
+        (
+          rm "$dev/bin/g-ir-compiler"
+          rm "$dev/bin/g-ir-scanner"
+          export bash="${buildPackages.bash}"
+          export emulator=${lib.escapeShellArg (stdenv.targetPlatform.emulator buildPackages)}
+          export emulatorwrapper="$dev/bin/g-ir-scanner-qemuwrapper"
+          export buildlddtree="${buildPackages.pax-utils}/bin/lddtree"
 
-      substituteAll "${./wrappers/g-ir-compiler.sh}" "$dev/bin/g-ir-compiler"
-      substituteAll "${./wrappers/g-ir-scanner.sh}" "$dev/bin/g-ir-scanner"
-      substituteAll "${./wrappers/g-ir-scanner-lddwrapper.sh}" "$dev/bin/g-ir-scanner-lddwrapper"
-      substituteAll "${./wrappers/g-ir-scanner-qemuwrapper.sh}" "$dev/bin/g-ir-scanner-qemuwrapper"
-      chmod +x $dev/bin/g-ir-*
-    )
-  ''
-  # when cross-compiling and using the wrapper then when a package looks up the g_ir_X
-  # variable with pkg-config they'll get the host version which can't be run
-  # override the variable to use the absolute path to g_ir_X in PATH which can be run
-  + ''
-    cat >> $dev/nix-support/setup-hook <<-'EOF'
-      override-pkg-config-gir-variables() {
-        PKG_CONFIG_GOBJECT_INTROSPECTION_1_0_G_IR_SCANNER="$(type -p g-ir-scanner)"
-        PKG_CONFIG_GOBJECT_INTROSPECTION_1_0_G_IR_COMPILER="$(type -p g-ir-compiler)"
-        PKG_CONFIG_GOBJECT_INTROSPECTION_1_0_G_IR_GENERATE="$(type -p g-ir-generate)"
-        export PKG_CONFIG_GOBJECT_INTROSPECTION_1_0_G_IR_SCANNER
-        export PKG_CONFIG_GOBJECT_INTROSPECTION_1_0_G_IR_COMPILER
-        export PKG_CONFIG_GOBJECT_INTROSPECTION_1_0_G_IR_GENERATE
-      }
+          export targetgir="${lib.getDev overridenTargetUnwrappedGir}"
 
-      preConfigureHooks+=(override-pkg-config-gir-variables)
-    EOF
-  '';
-})
+          substituteAll "${./wrappers/g-ir-compiler.sh}" "$dev/bin/g-ir-compiler"
+          substituteAll "${./wrappers/g-ir-scanner.sh}" "$dev/bin/g-ir-scanner"
+          substituteAll "${./wrappers/g-ir-scanner-lddwrapper.sh}" "$dev/bin/g-ir-scanner-lddwrapper"
+          substituteAll "${./wrappers/g-ir-scanner-qemuwrapper.sh}" "$dev/bin/g-ir-scanner-qemuwrapper"
+          chmod +x $dev/bin/g-ir-compiler
+          chmod +x $dev/bin/g-ir-scanner*
+        )
+      ''
+      # when cross-compiling and using the wrapper then when a package looks up the g_ir_X
+      # variable with pkg-config they'll get the host version which can't be run
+      # override the variable to use the absolute path to g_ir_X in PATH which can be run
+      + ''
+        cat >> $dev/nix-support/setup-hook <<-'EOF'
+          override-pkg-config-gir-variables() {
+            PKG_CONFIG_GOBJECT_INTROSPECTION_1_0_G_IR_SCANNER="$(type -p g-ir-scanner)"
+            PKG_CONFIG_GOBJECT_INTROSPECTION_1_0_G_IR_COMPILER="$(type -p g-ir-compiler)"
+            PKG_CONFIG_GOBJECT_INTROSPECTION_1_0_G_IR_GENERATE="$(type -p g-ir-generate)"
+            export PKG_CONFIG_GOBJECT_INTROSPECTION_1_0_G_IR_SCANNER
+            export PKG_CONFIG_GOBJECT_INTROSPECTION_1_0_G_IR_COMPILER
+            export PKG_CONFIG_GOBJECT_INTROSPECTION_1_0_G_IR_GENERATE
+          }
+
+          preConfigureHooks+=(override-pkg-config-gir-variables)
+        EOF
+      '';
+    })
+else
+  stdenv.mkDerivation (builtins.removeAttrs overridenUnwrappedGir.drvAttrs [ "name" ] # so we can get a fresh name generated from the pname
+    // {
+    pname = "gobject-introspection-wrapped";
+    passthru = overridenUnwrappedGir.passthru // {
+      unwrapped = overridenUnwrappedGir;
+    };
+    phases = [ "fixupPhase" ]; # don't remove, it is valid to set phases here.
+    dontStrip = true;
+    depsTargetTargetPropagated = [ overridenTargetUnwrappedGir ];
+    postFixup = ''
+      ${lib.concatMapStrings (output: ''
+        mkdir -p ${"$" + "${output}"}
+        ${lib.getExe buildPackages.xorg.lndir} ${gobject-introspection-unwrapped.${output}} ${"$" + "${output}"}
+      '') gobject-introspection-unwrapped.outputs}
+    '';
+  })

pkgs/top-level/all-packages.nix

···
   gns3-gui = gns3Packages.guiStable;
   gns3-server = gns3Packages.serverStable;
 
-  gobject-introspection = if (!stdenv.hostPlatform.canExecute stdenv.targetPlatform) && stdenv.targetPlatform.emulatorAvailable buildPackages
-    then callPackage ../development/libraries/gobject-introspection/wrapper.nix { } else gobject-introspection-unwrapped;
+  gobject-introspection = callPackage ../development/libraries/gobject-introspection/wrapper.nix { };
 
   gobject-introspection-unwrapped = callPackage ../development/libraries/gobject-introspection {
     nixStoreDir = config.nix.storeDir or builtins.storeDir;