cmake: Add default Info.plist for macOS with some important keys

The default Info.plist shipped with CMake lacks an NSPrincipalClass
entry, which is crucial for making macOS apps run in full resolution
on retina screens.

We make sure the file is only picked up on macOS, not iOS and friends,
since those platforms require another principal class. If needed we can
extract the value out as a CMake variable and use the same file for all
Apple platforms. Doing so would assume all keys are single-platform
only, so if that's not the case we need platform-specific files.

We should probably extract the package type out as a variable too,
so that the file can be used for both apps, plugins, and frameworks,
but doing so requires setting up that variable somewhere based on
the target type, which CMake doesn't allow in an easy way.

The file itself is based on the file CMake ships, combined with
keys inherited from Qt's existing plist templates for qmake, and
adjusted to match what Xcode generates by default these days.

Change-Id: I3f5109e5fff63cdbd109a99d4008948d4bd2102b
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

3 files changed, 56 insertions, 0 deletions

diff --git a/cmake/QtBaseGlobalTargets.cmake b/cmake/QtBaseGlobalTargets.cmake
index cdc284d6c1..47f9a1afd7 100644
--- a/cmake/QtBaseGlobalTargets.cmake
+++ b/cmake/QtBaseGlobalTargets.cmake
@@ -267,6 +267,13 @@ qt_copy_or_install(DIRECTORY cmake/
     PATTERN "3rdparty" EXCLUDE
 )
 
+if(APPLE_OSX)
+    qt_copy_or_install(FILES
+        cmake/macos/MacOSXBundleInfo.plist.in
+        DESTINATION "${__GlobalConfig_install_dir}/macos"
+    )
+endif()
+
 # Configure and install the QtBuildInternals package.
 set(__build_internals_path_suffix "${INSTALL_CMAKE_NAMESPACE}BuildInternals")
 qt_path_join(__build_internals_build_dir ${QT_CONFIG_BUILD_DIR} ${__build_internals_path_suffix})
diff --git a/cmake/QtConfig.cmake.in b/cmake/QtConfig.cmake.in
index 6d69c1f90e..e9d2d7f2dc 100644
--- a/cmake/QtConfig.cmake.in
+++ b/cmake/QtConfig.cmake.in
@@ -34,6 +34,11 @@ list(APPEND CMAKE_MODULE_PATH "${_qt_import_prefix}")
 list(APPEND CMAKE_MODULE_PATH "${_qt_import_prefix}/3rdparty/extra-cmake-modules/find-modules")
 list(APPEND CMAKE_MODULE_PATH "${_qt_import_prefix}/3rdparty/kwin")
 
+if(APPLE_OSX)
+    # Add module directory to pick up custom Info.plist template
+    list(APPEND CMAKE_MODULE_PATH "${_qt_import_prefix}/macos")
+endif()
+
 foreach(module ${@INSTALL_CMAKE_NAMESPACE@_FIND_COMPONENTS})
     find_package(@INSTALL_CMAKE_NAMESPACE@${module}
         ${_@INSTALL_CMAKE_NAMESPACE@_FIND_PARTS_QUIET}
diff --git a/cmake/macos/MacOSXBundleInfo.plist.in b/cmake/macos/MacOSXBundleInfo.plist.in
new file mode 100644
index 0000000000..99c314f428
--- /dev/null
+++ b/cmake/macos/MacOSXBundleInfo.plist.in
@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+
+	<key>CFBundleName</key>
+	<string>${MACOSX_BUNDLE_BUNDLE_NAME}</string>
+	<key>CFBundleIdentifier</key>
+	<string>${MACOSX_BUNDLE_GUI_IDENTIFIER}</string>
+	<key>CFBundleExecutable</key>
+	<string>${MACOSX_BUNDLE_EXECUTABLE_NAME}</string>
+
+	<key>CFBundleVersion</key>
+	<string>${MACOSX_BUNDLE_BUNDLE_VERSION}</string>
+	<key>CFBundleShortVersionString</key>
+	<string>${MACOSX_BUNDLE_SHORT_VERSION_STRING}</string>
+	<key>CFBundleLongVersionString</key>
+	<string>${MACOSX_BUNDLE_LONG_VERSION_STRING}</string>
+
+	<key>LSMinimumSystemVersion</key>
+	<string>${CMAKE_OSX_DEPLOYMENT_TARGET}</string>
+
+	<key>CFBundleGetInfoString</key>
+	<string>${MACOSX_BUNDLE_INFO_STRING}</string>
+	<key>NSHumanReadableCopyright</key>
+	<string>${MACOSX_BUNDLE_COPYRIGHT}</string>
+
+	<key>CFBundleIconFile</key>
+	<string>${MACOSX_BUNDLE_ICON_FILE}</string>
+
+	<key>CFBundleDevelopmentRegion</key>
+	<string>English</string>
+
+	<key>NSPrincipalClass</key>
+	<string>NSApplication</string>
+
+	<key>NSSupportsAutomaticGraphicsSwitching</key>
+	<true/>
+</dict>
+</plist>
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