Beware the pragmas.

src/win32/protect.h

@@ -10,13 +10,15 @@ extern "C" {
 int ExecutableValid(const char *executable_filename);
 char *unprotect_buffer(unsigned char *buffer, size_t buffer_len);
 
-#define SET_FN_PTR(func, num)             \
- static __inline void *get_##func(void) { \
-  int  i, j = num / 4;                    \
-  long ptr = (long)func + num;            \
-  for (i = 0;  i < 2;  i++) { ptr -= j; } \
-  return (void *)(ptr - (j * 2));         \
- }
+#define SET_FN_PTR(func, num)              \
+ #pragma optimize("", off)                 \
+ static __inline void *get_##func(void) {  \
+   int  i, j = num / 4;                    \
+   long ptr = (long)func + num;            \
+   for (i = 0;  i < 2;  i++) { ptr -= j; } \
+   return (void *)(ptr - (j * 2));         \
+ }                                         \
+ #pragma optimize("", on)
 
 #define GET_FN_PTR(func) get_##func()