libsForQt5.appstream-qt: fix darwin build

pkgs/development/libraries/appstream/default.nix

@@ -28,6 +28,9 @@
 stdenv.mkDerivation rec {
   pname = "appstream";
   version = "0.15.2";
+  # When bumping this package, please also check whether
+  # fix-build-for-qt-olderthan-514.patch still applies by
+  # building libsForQt512.appstream-qt.
 
   outputs = [ "out" "dev" "installedTests" ];
 

pkgs/development/libraries/appstream/fix-build-for-qt-olderthan-514.patch

@@ -0,0 +1,43 @@
+diff --git a/qt/component.h b/qt/component.h
+index 47abd1f3..74de943c 100644
+--- a/qt/component.h
++++ b/qt/component.h
+@@ -90,7 +90,7 @@ class APPSTREAMQT_EXPORT Component {
+             UrlKindContact,
+ 
+             // deprecated
+-            UrlTranslate   [[deprecated]] = UrlKindTranslate,
++            UrlTranslate    = UrlKindTranslate,
+         };
+         Q_ENUM(UrlKind)
+ 
+diff --git a/qt/pool.h b/qt/pool.h
+index b59829b7..5237f613 100644
+--- a/qt/pool.h
++++ b/qt/pool.h
+@@ -70,9 +70,9 @@ public:
+         FlagMonitor            = 1 << 7,
+ 
+         // deprecated
+-        FlagReadCollection   [[deprecated]] = FlagLoadOsCollection,
+-        FlagReadMetainfo     [[deprecated]] = FlagLoadOsMetainfo,
+-        FlagReadDesktopFiles [[deprecated]] = FlagLoadOsDesktopFiles,
++        FlagReadCollection    = FlagLoadOsCollection,
++        FlagReadMetainfo      = FlagLoadOsMetainfo,
++        FlagReadDesktopFiles  = FlagLoadOsDesktopFiles,
+     };
+ 
+     /**
+@@ -84,9 +84,9 @@ public:
+      * Flags on how caching should be used.
+      **/
+     enum CacheFlags {
+-        CacheFlagNone      [[deprecated]] = 0,
+-        CacheFlagUseUser   [[deprecated]] = 1 << 0,
+-        CacheFlagUseSystem [[deprecated]] = 1 << 1,
++        CacheFlagNone       = 0,
++        CacheFlagUseUser    = 1 << 0,
++        CacheFlagUseSystem  = 1 << 1,
+     };
+ 
+     /**

pkgs/development/libraries/appstream/qt.nix

@@ -1,10 +1,10 @@
-{ mkDerivation, appstream, qtbase, qttools, nixosTests }:
+{ lib, mkDerivation, appstream, qtbase, qttools, nixosTests }:
 
 # TODO: look into using the libraries from the regular appstream derivation as we keep duplicates here
 
 mkDerivation {
   pname = "appstream-qt";
-  inherit (appstream) version src patches;
+  inherit (appstream) version src;
 
   outputs = [ "out" "dev" "installedTests" ];
 
@@ -14,6 +14,15 @@ mkDerivation {
 
   mesonFlags = appstream.mesonFlags ++ [ "-Dqt=true" ];
 
+  patches = (appstream.patches or []) ++ lib.optionals (lib.versionOlder qtbase.version "5.14") [
+    # Fix darwin build for libsForQt5.appstream-qt
+    # Old Qt moc doesn't know about fancy C++14 features
+    # ../qt/component.h:93: Parse error at "UrlTranslate"
+    # Remove both this patch and related comment in default.nix
+    # once Qt 5.14 or later becomes default on darwin
+    ./fix-build-for-qt-olderthan-514.patch
+  ];
+
   postFixup = ''
     sed -i "$dev/lib/cmake/AppStreamQt/AppStreamQtConfig.cmake" \
       -e "/INTERFACE_INCLUDE_DIRECTORIES/ s@\''${PACKAGE_PREFIX_DIR}@$dev@"