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| author | Michael Brown | 2010-11-28 18:26:27 +0100 |
|---|---|---|
| committer | Michael Brown | 2010-11-28 18:28:52 +0100 |
| commit | 795793b3a4751936db4dc331aeb5f5549cfb3987 (patch) | |
| tree | 9577642ef8bcc565c3e0f66847007dfad31de68a /src/include/stddef.h | |
| parent | [hermon] Enable priority flow control on the FCoE priority (diff) | |
| download | ipxe-795793b3a4751936db4dc331aeb5f5549cfb3987.tar.gz ipxe-795793b3a4751936db4dc331aeb5f5549cfb3987.tar.xz ipxe-795793b3a4751936db4dc331aeb5f5549cfb3987.zip | |
[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>
Diffstat (limited to 'src/include/stddef.h')
| -rw-r--r-- | src/include/stddef.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/include/stddef.h b/src/include/stddef.h index 2a02a898..8e69545c 100644 --- a/src/include/stddef.h +++ b/src/include/stddef.h @@ -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) ({ \ |