qSwap: suppress pedantic warning about noexcept being false

This warning is not in -Wall or -Wextra, but it happens in a single
place, so we can reasonably suppress it.

Fixes: QTBUG-79138
Change-Id: Ib5d667bf77a740c28d2efffd15ccb3f62cf8f431
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>

src/corelib/global/qglobal.h

@@ -944,6 +944,10 @@ QT_WARNING_POP
 #  define Q_DUMMY_COMPARISON_OPERATOR(C)
 #endif
 
+QT_WARNING_PUSH
+// warning: noexcept-expression evaluates to ‘false’ because of a call to ‘void swap(..., ...)'
+QT_WARNING_DISABLE_GCC("-Wnoexcept")
+
 namespace QtPrivate
 {
 namespace SwapExceptionTester { // insulate users from the "using std::swap" below
@@ -963,6 +967,8 @@ inline void qSwap(T &value1, T &value2)
     swap(value1, value2);
 }
 
+QT_WARNING_POP
+
 #if QT_DEPRECATED_SINCE(5, 0)
 Q_CORE_EXPORT QT_DEPRECATED void *qMalloc(size_t size) Q_ALLOC_SIZE(1);
 Q_CORE_EXPORT QT_DEPRECATED void qFree(void *ptr);