QProperty: only use MSVC bug workaround on MSVC

The fix for QTBUG-106277 appears to cause issues with older gcc versions
in C++2a mode (for instance used in our headers check).
Thus, use the old code for all non-MSVC compilers, which never had
problems with it.

Pick-to: 6.4 6.2
Fixes: QTBUG-108039
Change-Id: If6a0ce6e8f41e9dc752614557e96c555ca0fe75c
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

src/corelib/kernel/qproperty.h

@@ -18,7 +18,16 @@
 #if defined(__cpp_lib_source_location)
 #define QT_SOURCE_LOCATION_NAMESPACE std
 #define QT_PROPERTY_COLLECT_BINDING_LOCATION
-#define QT_PROPERTY_DEFAULT_BINDING_LOCATION QPropertyBindingSourceLocation::fromStdSourceLocation(std::source_location::current())
+#if defined(Q_CC_MSVC)
+/* MSVC runs into an issue with constexpr with source location (error C7595)
+   so use the factory function as a workaround */
+#  define QT_PROPERTY_DEFAULT_BINDING_LOCATION QPropertyBindingSourceLocation::fromStdSourceLocation(std::source_location::current())
+#else
+/* some versions of gcc in turn run into
+   expression ‘std::source_location::current()’ is not a constant expression
+   so don't use the workaround there */
+#  define QT_PROPERTY_DEFAULT_BINDING_LOCATION QPropertyBindingSourceLocation(std::source_location::current())
+#endif
 #endif
 #endif