gst_all_1: Fix evaluation on Darwin, fix gstreamer builds.

Commit be382109ad broke evaluation
on Darwin because it added these unconditional buildInputs
that don't evaluate on Darwin:

    libnice librdf lilv lv2 serd sord sratom

This commit fixes it, and also fixes recently-added new dependencies
for other packages accordingly.

It further fixes the build of many gstreamer packages on Darwin.

pkgs/development/libraries/gstreamer/base/default.nix

@@ -15,6 +15,7 @@
 , libopus
 , isocodes
 , libjpeg
+, libpng
 , libvisual
 , tremor # provides 'virbisidec'
 , libGL
@@ -27,8 +28,12 @@
 , wayland
 , enableAlsa ? stdenv.isLinux
 , alsaLib
+# Enabling Cocoa seems to currently not work, giving compile
+# errors. Suspected is that a newer version than clang
+# is needed than 5.0 but it is not clear.
 , enableCocoa ? false
 , darwin
+, enableGl ? (enableX11 || enableWayland || enableCocoa)
 , enableCdparanoia ? (!stdenv.isDarwin)
 , cdparanoia
 }:
@@ -68,11 +73,16 @@ stdenv.mkDerivation rec {
     libintl
     libopus
     isocodes
+    libpng
     libjpeg
     tremor
     libGL
-  ] ++ lib.optional (!stdenv.isDarwin) libvisual
-    ++ lib.optional enableAlsa alsaLib
+  ] ++ lib.optional (!stdenv.isDarwin) [
+    libvisual
+  ] ++ lib.optionals stdenv.isDarwin [
+    pango
+    darwin.apple_sdk.frameworks.OpenGL
+  ] ++ lib.optional enableAlsa alsaLib
     ++ lib.optionals enableX11 [ libXv pango ]
     ++ lib.optional enableWayland wayland
     ++ lib.optional enableCocoa darwin.apple_sdk.frameworks.Cocoa
@@ -85,6 +95,7 @@ stdenv.mkDerivation rec {
   mesonFlags = [
     "-Dexamples=disabled" # requires many dependencies and probably not useful for our users
     "-Dgl-graphene=disabled" # not packaged in nixpkgs as of writing
+    "-Dgl_platform=[${lib.optionalString (enableX11 || enableWayland || enableCocoa) "auto"}]"
     # See https://github.com/GStreamer/gst-plugins-base/blob/d64a4b7a69c3462851ff4dcfa97cc6f94cd64aef/meson_options.txt#L15 for a list of choices
     "-Dgl_winsys=[${lib.concatStringsSep "," (lib.optional enableX11 "x11" ++ lib.optional enableWayland "wayland" ++ lib.optional enableCocoa "cocoa")}]"
     # We must currently disable gtk_doc API docs generation,
@@ -98,15 +109,40 @@ stdenv.mkDerivation rec {
   ]
   ++ lib.optional (!enableX11) "-Dx11=disabled"
   # TODO How to disable Wayland?
+  ++ lib.optional (!enableGl) "-Dgl=disabled"
   ++ lib.optional (!enableAlsa) "-Dalsa=disabled"
-  ++ lib.optional (!enableCdparanoia) "-Dcdparanoia=disabled";
+  ++ lib.optional (!enableCdparanoia) "-Dcdparanoia=disabled"
+  ++ lib.optionals stdenv.isDarwin [
+    "-Dlibvisual=disabled"
+  ];
 
   postPatch = ''
     patchShebangs common/scangobj-merge.py
   '';
 
+  # This package has some `_("string literal")` string formats
+  # that trip up clang with format security enabled.
+  hardeningDisable = [ "format" ];
+
   doCheck = false; # fails, wants DRI access for OpenGL
 
+  passthru = {
+    # Downstream `gst-*` packages depending on `gst-plugins-base`
+    # have meson build options like 'gl' etc. that depend
+    # on these features being built in `-base`.
+    # If they are not built here, then the downstream builds
+    # will fail, as they, too, use `-Dauto_features=enabled`
+    # which would enable these options unconditionally.
+    # That means we must communicate to these downstream packages
+    # if the `-base` enabled these options or not, so that
+    # the can enable/disable those features accordingly.
+    # The naming `*Enabled` vs `enable*` is intentional to
+    # distinguish inputs from outputs (what is to be built
+    # vs what was built) and to make them easier to search for.
+    glEnabled = enableGl;
+    waylandEnabled = enableWayland;
+  };
+
   meta = with lib; {
     description = "Base GStreamer plug-ins and helper libraries";
     homepage = "https://gstreamer.freedesktop.org";