Enable LTCG/LTO for release builds

Author: cgutman

globaldefs.pri

@@ -20,6 +20,21 @@ CONFIG(release, debug|release) {
     }
 }
 
+# Enable LTCG/LTO for release builds
+CONFIG(release, debug|release) {
+    *-msvc {
+        QMAKE_CFLAGS += /GL
+        QMAKE_CXXFLAGS += /GL
+        QMAKE_LFLAGS += /LTCG
+    }
+
+    macx {
+        QMAKE_CFLAGS += -flto=thin
+        QMAKE_CXXFLAGS += -flto=thin
+        QMAKE_LFLAGS += -flto=thin
+    }
+}
+
 # Enable ASan for Linux or macOS
 #CONFIG += sanitizer sanitize_address