diff options
Diffstat (limited to 'math/math.h')
| -rw-r--r-- | math/math.h | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/math/math.h b/math/math.h index 5f5a498b11..bbc1ab9bfa 100644 --- a/math/math.h +++ b/math/math.h @@ -65,8 +65,15 @@ __BEGIN_DECLS # define INFINITY HUGE_VALF # endif -/* Get machine-dependent NAN value (returned for some domain errors). */ -# include <bits/nan.h> +/* IEEE Not A Number. */ +# if __GNUC_PREREQ (3, 3) +# define NAN (__builtin_nanf ("")) +# else +/* This will raise an "invalid" exception outside static initializers, + but is the best that can be done in ISO C while remaining a + constant expression. */ +# define NAN (0.0f / 0.0f) +# endif #endif /* __USE_ISOC99 */ #if __GLIBC_USE (IEC_60559_BFP_EXT) |