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| author | Joseph Myers <joseph@codesourcery.com> | 2017-08-31 16:39:25 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2017-08-31 16:39:25 +0000 |
| commit | c0c49d60cfeff3b2aa801d6598143a073989654a (patch) | |
| tree | 248bd1a808a8f2e27396ddfd1c04e5362d7e5da2 /bits | |
| parent | 5ef1b2138d4236bb3616e612c5bc4dc328a9ffb2 (diff) | |
| download | glibc-c0c49d60cfeff3b2aa801d6598143a073989654a.zip glibc-c0c49d60cfeff3b2aa801d6598143a073989654a.tar.gz glibc-c0c49d60cfeff3b2aa801d6598143a073989654a.tar.bz2 | |
Simplify NAN definitions.
Similar to my patches for HUGE_VAL and INFINITY. this patch eliminates
the bits/nan.h headers. __builtin_nanf ("") is used to define NAN for
GCC 3.3 and later; the fallback is (0.0f / 0.0f), which is a constant
expression for a quiet NaN of type float, but raises a spurious
"invalid" exception outside static initializers, which seems the best
that can be done purely in standard C. Again, if anyone actually uses
a compiler with its own incompatible extension for producing a
constant quiet NaN, we can add compiler conditionals.
Tested for x86_64.
* math/math.h [__USE_ISOC99] (NAN): Define directly here. Do not
include <bits/nan.h>.
* math/Makefile (headers): Remove bits/nan.h.
* bits/nan.h: Remove.
* sysdeps/ieee754/bits/nan.h: Likewise.
* sysdeps/mips/bits/nan.h: Likewise.
Diffstat (limited to 'bits')
| -rw-r--r-- | bits/nan.h | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/bits/nan.h b/bits/nan.h deleted file mode 100644 index ab38168..0000000 --- a/bits/nan.h +++ /dev/null @@ -1,5 +0,0 @@ -#ifndef _MATH_H -#error "Never use <bits/nan.h> directly; include <math.h> instead." -#endif - -/* This file should define `NAN' on machines that have such things. */ |