Respect MRB_USE_CXX_ABI #define
MODIFY
src/vm.c
src/vm.c
extern "C" {
#endif
void abort(void);
+#if defined(__cplusplus)
+} /* extern "C" { */
+#endif
+#endif
+
+#if defined(__cplusplus)
+# if !defined(MRB_USE_CXX_ABI)
+extern "C" {
+# endif
#endif
#define STACK_INIT_SIZE 128

Respect MRB_USE_CXX_ABI #define