[cfe-commits] [PATCH] stddef.h: redefine offsetof macro every time the header is included

[Evgeniy Stepanov]

Hi,

this patch moves offsetof definition outside of the header guard in
Clang stddef.h header. As a result, it will override any conflicting
definition of this macro every time stddef.h is included.

On linux there is a conflicting definition in
/usr/include/linux/sysdef.h, which, unlike Clang definition, is not a
compile-time constant. Failing to override it with Clang definition
breaks some code that otherwise (i.e. with GCC) compiles.

This mimics GCC header behaviour which also redefines offsetof
everytime it is included.

Since this is a compiler header, we don't need #undef to override an
earlier definition.

Please review.
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