Add support for C11 static_assert and thread_local

Tested with Clang, GCC 4.5 & up, ICC 17 and MSVC 2017. No current
version of MSVC supports C11 and GCC implemented the features slightly
later in C than in C++.

Change-Id: I57a1bd6e0c194530b732fffd14f45c5074c9a052
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/tests/auto/corelib/global/qglobal/tst_qglobal.cpp b/tests/auto/corelib/global/qglobal/tst_qglobal.cpp
index 083526fdc4..78b954f373 100644
--- a/tests/auto/corelib/global/qglobal/tst_qglobal.cpp
+++ b/tests/auto/corelib/global/qglobal/tst_qglobal.cpp
@@ -39,6 +39,7 @@ class tst_QGlobal: public QObject
     Q_OBJECT
 
 private slots:
+    void cMode();
     void qIsNull();
     void for_each();
     void qassert();
@@ -56,6 +57,22 @@ private slots:
     void testqOverload();
 };
 
+extern "C" {        // functions in qglobal.c
+void tst_GlobalTypes();
+int tst_QtVersion();
+const char *tst_qVersion();
+}
+
+void tst_QGlobal::cMode()
+{
+    tst_GlobalTypes();
+    QCOMPARE(tst_QtVersion(), QT_VERSION);
+
+#ifndef QT_NAMESPACE
+    QCOMPARE(tst_qVersion(), qVersion());
+#endif
+}
+
 void tst_QGlobal::qIsNull()
 {
     double d = 0.0;