Pointer comparisons and compare to NULL

internal/catch_common.h

@@ -17,6 +17,9 @@
 #define INTERNAL_CATCH_UNIQUE_NAME_LINE( name, line ) INTERNAL_CATCH_UNIQUE_NAME_LINE2( name, line )
 #define INTERNAL_CATCH_UNIQUE_NAME( name ) INTERNAL_CATCH_UNIQUE_NAME_LINE( name, __LINE__ )
 
+#define INTERNAL_CATCH_STRINGIFY2( expr ) #expr
+#define INTERNAL_CATCH_STRINGIFY( expr ) INTERNAL_CATCH_STRINGIFY2( expr )
+
 #ifdef __GNUC__
 #define ATTRIBUTE_NORETURN __attribute__ ((noreturn))
 #else