diff options
Diffstat (limited to 'libc/sysdeps/linux')
| -rw-r--r-- | libc/sysdeps/linux/common/bits/nan.h | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/libc/sysdeps/linux/common/bits/nan.h b/libc/sysdeps/linux/common/bits/nan.h index 6d88b551b..bae97f216 100644 --- a/libc/sysdeps/linux/common/bits/nan.h +++ b/libc/sysdeps/linux/common/bits/nan.h @@ -1,5 +1,5 @@ /* `NAN' constant for IEEE 754 machines. - Copyright (C) 1992, 1996, 1997, 1999 Free Software Foundation, Inc. + Copyright (C) 1992,1996,1997,1999,2004,2006 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -24,11 +24,15 @@ /* IEEE Not A Number. */ -#ifdef __GNUC__ +#if __GNUC_PREREQ(3,3) + +# define NAN (__builtin_nanf ("")) + +#elif defined __GNUC__ # define NAN \ - (__extension__ \ - ((union { unsigned __l __attribute__((__mode__(__SI__))); float __d; }) \ + (__extension__ \ + ((union { unsigned __l __attribute__ ((__mode__ (__SI__))); float __d; }) \ { __l: 0x7fc00000UL }).__d) #else @@ -42,7 +46,8 @@ # define __nan_bytes { 0, 0, 0xc0, 0x7f } # endif -static union { unsigned char __c[4]; float __d; } __nan_union = { __nan_bytes }; +static union { unsigned char __c[4]; float __d; } __nan_union + __attribute_used__ = { __nan_bytes }; # define NAN (__nan_union.__d) #endif /* GCC. */ |