Check for compatible Qt version when building PySide2

Shiboken uses C++11 constructs like qAsConst, which necessitates
the usage of a Qt version >= 5.7. Instead of showing weird compilation
errors when building against Qt 5.6, print a nice error message.

Change-Id: Iea4bd41dbe1d7d05e9b28bfa6654f68c6633cd74
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

1 files changed, 6 insertions, 1 deletions

diff --git a/setup.py b/setup.py
index 94fecfb4e..559e9286f 100644
--- a/setup.py
+++ b/setup.py
@@ -411,7 +411,12 @@ def get_qt_version():
     qt_version = qtinfo.version
 
     if not qt_version:
-        log.error("Failed to query the Qt version with qmake %s" % self.qtinfo.qmake_command)
+        log.error("Failed to query the Qt version with qmake {0}".format(self.qtinfo.qmake_command))
+        sys.exit(1)
+
+    if LooseVersion(qtinfo.version) < LooseVersion("5.7"):
+        m = "Incompatible Qt version detected: {0}. A Qt version >= 5.7 is required."
+        log.error(m.format(qt_version))
         sys.exit(1)
 
     return qt_version