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[build] Use __builtin_offsetof() when available 

Some newer versions of gcc (observed with a patched gcc 4.5.1) seem to
treat our offsetof() implementation as not being a compile-time
constant.  Fix by using __builtin_offsetof() when available.  (As with
the original offsetof() macro, this code is copied from the Linux
kernel's stddef.h.)

Reported-by: Arkadiusz Miskiewicz <arekm@maven.pl>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2010-11-28 17:26:27 +00:00
parent aa1c59ccff
commit 795793b3a4
1 changed files with 4 additions and 0 deletions
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4
src/include/stddef.h
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@ -10,7 +10,11 @@ FILE_LICENCE ( GPL2_ONLY );
#define NULL ((void *)0)
#undef offsetof
#ifdef __compiler_offsetof
#define offsetof(TYPE,MEMBER) __compiler_offsetof(TYPE,MEMBER)
#else
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
#endif
#undef container_of
#define container_of(ptr, type, member) ({ \