Fixed an issue on some compilers with implicit conversion from nullptr to Ptr

- also cleaned up some warnings to do with CATCH_NULL

include/internal/catch_runner_impl.hpp

@@ -78,7 +78,7 @@ namespace Catch {
         virtual ~RunContext() {
             m_reporter->testRunEnded( TestRunStats( m_runInfo, m_totals, aborting() ) );
             m_context.setRunner( m_prevRunner );
-            m_context.setConfig( CATCH_NULL );
+            m_context.setConfig( Ptr<IConfig const>() );
             m_context.setResultCapture( m_prevResultCapture );
             m_context.setConfig( m_prevConfig );
         }

projects/SelfTest/CmdLineTests.cpp

@@ -9,6 +9,9 @@
 #include "catch.hpp"
 #include "catch_test_spec_parser.hpp"
 
+#ifdef __clang__
+#   pragma clang diagnostic ignored "-Wc++98-compat"
+#endif
 
 inline Catch::TestCase fakeTestCase( const char* name, const char* desc = "" ){ return Catch::makeTestCase( CATCH_NULL, "", name, desc, CATCH_INTERNAL_LINEINFO ); }
 

projects/SelfTest/ConditionTests.cpp

@@ -7,6 +7,7 @@
  */
 #ifdef __clang__
 #   pragma clang diagnostic ignored "-Wpadded"
+#   pragma clang diagnostic ignored "-Wc++98-compat"
 #endif
 
 #include "catch.hpp"

projects/SelfTest/SectionTrackerTests.cpp

@@ -8,6 +8,7 @@
 
 #ifdef __clang__
 #   pragma clang diagnostic ignored "-Wpadded"
+#   pragma clang diagnostic ignored "-Wc++98-compat"
 #endif
 
 #include "internal/catch_test_case_tracker.hpp"

projects/SelfTest/SurrogateCpps/catch_xmlwriter.cpp

@@ -1,2 +1,4 @@
 // This file is only here to verify (to the extent possible) the self sufficiency of the header
+#include "catch_suppress_warnings.h"
 #include "catch_xmlwriter.hpp"
+#include "catch_reenable_warnings.h"

projects/SelfTest/TestMain.cpp

@@ -18,6 +18,7 @@ CATCH_REGISTER_TAG_ALIAS( "[@tricky]", "[tricky]~[.]" )
 #ifdef __clang__
 #   pragma clang diagnostic ignored "-Wpadded"
 #   pragma clang diagnostic ignored "-Wweak-vtables"
+#   pragma clang diagnostic ignored "-Wc++98-compat"
 #endif