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use __builtin_offsetof to implement offsetof when possible

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apparently recent gcc versions have intentionally broken the
traditional definition by treating it as a non-constant expression.
the traditional definition may also be problematic for c++ programs.
This commit is contained in:
Rich Felker 2012-12-05 00:00:42 -05:00
parent b427c82265
commit a7c1f9727a
1 changed files with 4 additions and 0 deletions
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4
include/stddef.h
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@ -14,6 +14,10 @@
#include <bits/alltypes.h>
#if __GNUC__ > 3
#define offsetof(type, member) __builtin_offsetof(type, member)
#else
#define offsetof(type, member) ((size_t)( (char *)&(((type *)0)->member) - (char *)0 ))
#endif
#endif