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SubjectRe: Build failure with v4.9-rc1 and GCC trunk -- compiler weirdness
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On Wed, 2017-02-01 at 19:53 +0000, Ard Biesheuvel wrote:
> On 1 February 2017 at 19:49, Joe Perches <joe@perches.com> wrote:
[]
> > Or maybe add a BUILD_BUG_ON something like:
> >
> > #define order_base_2(n) \
> > ({ \
> > typeof(n) _n = n; \
> > BUILD_BUG_ON(__builtin_constant_p(_n) && _n < 0); \
> > __builtin_constant_p(_n) ? (_n < 2 ? _n : ilog2((_n) - 1) + 1)) \
> > : __order_base_2(_n); \
> > })
> >
>
> This would interfere with the ability to use order_base_2() in
> initializers for global variables.

There aren't any as far as I can tell and would using
order_base_2() for a global initializer make sense?


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