Avoid XSync-related runtime crashes on HP-UX due to C++ mangling.

HP-UX is missing the extern "C" wrapper for its XSync function
declarations. This caused applications to _build_ but not _run_ (i.e.,
all GUI apps crashed). Adding the wrapper should be harmless on all
X11 platforms.

Task-number: QTBUG-5524
Reviewed-by: Thiago

1 files changed, 5 insertions, 1 deletions

diff --git a/config.tests/x11/xsync/xsync.cpp b/config.tests/x11/xsync/xsync.cpp
index a7175deb76..8eea8508c1 100644
--- a/config.tests/x11/xsync/xsync.cpp
+++ b/config.tests/x11/xsync/xsync.cpp
@@ -41,12 +41,16 @@
 
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
+extern "C" {
 #include <X11/extensions/sync.h>
+}
 
 int main(int, char **)
 {
     XSyncValue value;
     (void*)&XSyncIntToValue;
     (void*)&XSyncCreateCounter;
-    return 0;
+    int a, b;
+    Status ret = XSyncInitialize(NULL, &a, &b);
+    return ret;
 }