osx - How to undefine system function-like macros? -


i'm trying build code defines method howmany().

in osx there function-like macro same name in /usr/include/sys/types.h

#define howmany(x, y)   __darwin_howmany(x, y)

following a previous question, i've tried including #undef in header file 

#ifdef howmany #undef howmany /*undefining '/usr/include/sys/types.h' */ #endif

but function-like macro remains active.

/usr/include/sys/types.h:184:9: note: macro 'howmany' defined here #define howmany(x, y) __darwin_howmany(x, y) /* # y's == x bits? */

how should deactivate function-like macro?

this incredibly fragile. yes, can work, small changes how things imported cause fail again (or worse, call wrong code). need make sure #undef included in every file might include types.h , it's undefined after it's defined. many ways can break. rename function. name taken.


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