David Chisnall <thera...@freebsd.org> writes:
> Author: theraven
> Date: Fri Jul 12 11:03:51 2013
> New Revision: 253260
> URL: http://svnweb.freebsd.org/changeset/base/253260
>
> Log:
> Fix the build with C++ where __builtin_types_compatible_p is not allowed.
>
> Modified:
> head/lib/msun/src/math.h
>
> Modified: head/lib/msun/src/math.h
> ==============================================================================
> --- head/lib/msun/src/math.h Fri Jul 12 10:07:48 2013 (r253259)
> +++ head/lib/msun/src/math.h Fri Jul 12 11:03:51 2013 (r253260)
> @@ -81,12 +81,13 @@ extern const union __nan_un {
> #define FP_SUBNORMAL 0x08
> #define FP_ZERO 0x10
>
> -#if __STDC_VERSION__ >= 201112L && defined(__clang__)
> +#if (__STDC_VERSION__ >= 201112L && defined(__clang__)) || \
> + __has_extension(c_generic_selections)
> #define __fp_type_select(x, f, d, ld) _Generic((x), \
> float: f(x), \
> double: d(x), \
> long double: ld(x))
One of the things that's making cad/brlcad fail with clang is some C
code that calls isnan() and isinf() with -std=gnu89, -Werror and
-Wc11-extensions:
/s/brlcad/src/libbn/ulp.c:170:9: error: generic selections are a C11-specific
feature [-Werror,-Wc11-extensions]
if (isnan(val) || isinf(val))
^
/usr/include/math.h:118:2: note: expanded from macro 'isnan'
__fp_type_select(x, __inline_isnanf, __inline_isnan, __inline_isnanl)
^
/usr/include/math.h:86:39: note: expanded from macro '__fp_type_select'
#define __fp_type_select(x, f, d, ld) _Generic((x), \
^
Can the check there be improved somehow to avoid this kind of error?
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