On Thu, Mar 15, 2018 at 4:17 PM, Miguel Ojeda
<miguel.ojeda.sando...@gmail.com> wrote:
>> The full one, using your naming convention:
>>
>> #define const_max(x, y) \
>> ({ \
>> if (!__builtin_constant_p(x)) \
>> __error_not_const_arg(); \
>> if (!__builtin_constant_p(y)) \
>> __error_not_const_arg(); \
>> if (!__builtin_types_compatible_p(typeof(x), typeof(y))) \
>> __error_incompatible_types(); \
>> if ((x) < 0) \
>> __error_not_positive_arg(); \
>> if ((y) < 0) \
>> __error_not_positive_arg(); \
>> __builtin_choose_expr((x) > (y), (x), (y)); \
>> })
>>
>
> Nevermind... gcc doesn't take that as a constant expr, even if it
> compiles as one at -O0.
Yeah, unfortunately. :(
-Kees
--
Kees Cook
Pixel Security
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