Messages in this thread | | | Subject | Re: Question on FIELD_PREP() for static array | From | Johannes Berg <> | Date | Thu, 11 Oct 2018 21:22:34 +0200 |
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On Thu, 2018-10-11 at 21:13 +0200, Johannes Berg wrote: > > However, I have another trick: > > #define __NLA_ENSURE(condition) (0 * sizeof(struct { unsigned int x:1 - 2*!(condition);})) > > or, in this context, > > #define BUILD_BUG_ON_RET_ZERO(cond) (0 * sizeof(struct { unsigned int x:1 - 2*!(condition);}))
Oops, I forgot to insert the second !, it must be
#define BUILD_BUG_ON_RET_ZERO(cond) (0 * sizeof(struct { unsigned int x:1 - 2*!!(condition);}))
johannes
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