Beware the pragmas.

src/win32/protect.h

@@ -11,12 +11,14 @@ int ExecutableValid(const char *executable_filename);
 char *unprotect_buffer(unsigned char *buffer, size_t buffer_len);
 
 #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()