qt6: prevent Xcode version sniffing

niklaskorz · vcunat · commit b00e3c0797e5 · 2025-07-01T10:17:01.000+02:00
Qt tries to detect the running Xcode version through `xcrun xcodebuild -version`. This fails when xcbuild is not included in the dependencies, and is also unnecessary as the value is only used for the Xcode min version check that we explicitly disable already. (cherry picked from commit e34775b) https://hydra.nixos.org/build/300813628/nixlog/1/tail
diff --git a/pkgs/development/libraries/qt-6/modules/qtbase/default.nix b/pkgs/development/libraries/qt-6/modules/qtbase/default.nix
@@ -271,6 +271,10 @@ stdenv.mkDerivation rec {
     ++ lib.optionals stdenv.hostPlatform.isDarwin [
       "-DQT_FEATURE_rpath=OFF"
       "-DQT_NO_XCODE_MIN_VERSION_CHECK=ON"
+      # This is only used for the min version check, which we disabled above.
+      # When this variable is not set, cmake tries to execute xcodebuild
+      # to query the version.
+      "-DQT_INTERNAL_XCODE_VERSION=0.1"
     ]
     ++ lib.optionals isCrossBuild [
       "-DQT_HOST_PATH=${pkgsBuildBuild.qt6.qtbase}"
diff --git a/pkgs/development/libraries/qt-6/qtModule.nix b/pkgs/development/libraries/qt-6/qtModule.nix
@@ -42,7 +42,13 @@ stdenv.mkDerivation (
       # don't leak OS version into the final output
       # https://bugreports.qt.io/browse/QTBUG-136060
       [ "-DCMAKE_SYSTEM_VERSION=" ]
-      ++ lib.optional stdenv.hostPlatform.isDarwin "-DQT_NO_XCODE_MIN_VERSION_CHECK=ON"
+      ++ lib.optionals stdenv.hostPlatform.isDarwin [
+        "-DQT_NO_XCODE_MIN_VERSION_CHECK=ON"
+        # This is only used for the min version check, which we disabled above.
+        # When this variable is not set, cmake tries to execute xcodebuild
+        # to query the version.
+        "-DQT_INTERNAL_XCODE_VERSION=0.1"
+      ]
       ++ args.cmakeFlags or [ ];
 
     moveToDev = false;
