Use bit shifting to pack function pointers to `mrb_method_t`.
So you don't need `-falign-functions=2` anymore. Instead your platform
must not use higher bits of the pointer (true for most platforms).
If not, you have to use `struct mrb_method_t` version.
MODIFY
include/mruby/proc.h
include/mruby/proc.h
@@ -101,9 +101,9 @@ MRB_API mrb_value mrb_proc_cfunc_env_get(mrb_state *mrb, mrb_int idx);
#define MRB_METHOD_FUNC_FL ((uintptr_t)1)
#define MRB_METHOD_FUNC_P(m) (((uintptr_t)(m))&MRB_METHOD_FUNC_FL)
-#define MRB_METHOD_FUNC(m) ((mrb_func_t)((uintptr_t)(m)&(~MRB_METHOD_FUNC_FL)))
-#define MRB_METHOD_FROM_FUNC(m,fn) ((m)=(mrb_method_t)((struct RProc*)((uintptr_t)(fn)|MRB_METHOD_FUNC_FL)))
-#define MRB_METHOD_FROM_PROC(m,pr) ((m)=(mrb_method_t)(struct RProc*)(pr))
+#define MRB_METHOD_FUNC(m) ((mrb_func_t)((uintptr_t)(m)>>2))
+#define MRB_METHOD_FROM_FUNC(m,fn) ((m)=(mrb_method_t)((((uintptr_t)(fn))<<2)|MRB_METHOD_FUNC_FL))
+#define MRB_METHOD_FROM_PROC(m,pr) ((m)=(mrb_method_t)(pr))
#define MRB_METHOD_PROC_P(m) (!MRB_METHOD_FUNC_P(m))
#define MRB_METHOD_PROC(m) ((struct RProc*)(m))
#define MRB_METHOD_UNDEF_P(m) ((m)==0)

Use bit shifting to pack function pointers to `mrb_method_t`.

So you don't need `-falign-functions=2` anymore. Instead your platform
must not use higher bits of the pointer (true for most platforms).
If not, you have to use `struct mrb_method_t` version.