Question

I’m having the following problem with a macro for a function. This was working until I added the print_heavyhitters function. I have this in m61.h:

#if !M61_DISABLE
#define malloc(sz)      m61_malloc((sz), __FILE__, __LINE__)
#define free(ptr)       m61_free((ptr), __FILE__, __LINE__)
#define realloc(ptr, sz)    m61_realloc((ptr), (sz), __FILE__, __LINE__)
#define calloc(nmemb, sz)   m61_calloc((nmemb), (sz), __FILE__, __LINE__)
#define print_heavyhitters(sz)  print_heavyhitters((sz), __FILE__, __LINE__)
#endif

in m61.c, all of these functions are fine except print_heavyhitters(sz). I get ” – Macro usage error on the function print_heavyhitters:

- Macro usage error for macro: 
 print_heavyhitters
- Syntax error

m61.c:

#include "m61.h"
...

void *m61_malloc(size_t sz, const char *file, int line) {...}

void print_heavyhitters(size_t sz, const char *file, int line) {...}

Answer 1

You use the same name for the macro and the function it was intended to expand to.