CI fixes (#1744)
* Fix warning that not including a cmake source or build dir will be a fatal error (it is now on newest CMakes)
* Fixes appveyor
* Travis uses CMake 3.9 for more than a year now
* Travis dropped sudo: false in December
* Dropping Sphinx 2
- clang7: Suppress self-assign warnings; fix missing virtual dtors
- pypy:
- Keep old version (newer stuff breaks)
- Pin packages to extra index for speed
- travis:
- Make docker explicit; remove docker if not needed
- Make commands more verbose (for debugging / repro)
- Make Ubuntu dist explicit per job
- Fix Windows
- Add names to travis
diff --git a/tests/test_virtual_functions.cpp b/tests/test_virtual_functions.cpp
index c9a561c..ccf018d 100644
--- a/tests/test_virtual_functions.cpp
+++ b/tests/test_virtual_functions.cpp
@@ -129,6 +129,7 @@
class NCVirt {
public:
+ virtual ~NCVirt() { }
virtual NonCopyable get_noncopyable(int a, int b) { return NonCopyable(a, b); }
virtual Movable get_movable(int a, int b) = 0;