http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52635

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-03-20 
18:06:33 UTC ---
Not sure what kernel you are looking at, but in current kernel at least since
2009-09 BUILD_BUG_ON is BUILD_BUG_ON_ZERO and only MAYBE_BUILD_BUG_ON macro is
using this sizeof and from the description it sounds like it wants the warnings
only if the condition is known to be false already during parsing.

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