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| author | Joseph Myers <joseph@codesourcery.com> | 2016-08-03 17:30:41 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2016-08-03 17:30:41 +0000 |
| commit | bf91be88ea90c1ea888d5646270d66363389ce96 (patch) | |
| tree | 47698077c37a33c048dd303dfe41366d2f017bca /math/math.h | |
| parent | f2de695bf6ab3d346bf0ec4e436f124cff8edfd4 (diff) | |
| download | glibc-bf91be88ea90c1ea888d5646270d66363389ce96.tar.gz glibc-bf91be88ea90c1ea888d5646270d66363389ce96.tar.xz glibc-bf91be88ea90c1ea888d5646270d66363389ce96.zip | |
Support __STDC_WANT_IEC_60559_BFP_EXT__ feature test macro.
This patch implements support for the __STDC_WANT_IEC_60559_BFP_EXT__ feature test macro from ISO/IEC 18661-1:2014, following the __GLIBC_USE approach now used for __STDC_WANT_LIB_EXT2__. For this macro, the relevant consideration is whether it is defined or undefined when an affected header is included (not what its value is if defined, and not whether it's defined or undefined when any other unaffected system header is included). Currently this macro only affects the issignaling macro and the nextup and nextdown functions (so they can be enabled by defining this macro, not just by defining _GNU_SOURCE as previously). Any further features from this TS added in future would also be conditioned on this macro. Tested for x86_64 and x86 (testsuite, and that installed stripped shared libraries are unchanged by the patch). * bits/libc-header-start.h (__GLIBC_USE_IEC_60559_BFP_EXT): New macro. * include/features.h (__STDC_WANT_IEC_60559_BFP_EXT__): Document. * manual/arith.texi (issignaling): Document as ISO from TS 18661-1:2014. (nextup): Likewise. (nextupf): Likewise. (nextupl): Likewise. (nextdown): Likewise. (nextdownf): Likewise. (nextdownl): Likewise. * manual/creature.texi (__STDC_WANT_IEC_60559_BFP_EXT__): Document macro. * math/math.h: Define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION and include <bits/libc-header-start.h> instead of including <features.h>. (issignaling): Define if [__GLIBC_USE (IEC_60559_BFP_EXT)], not [__USE_GNU]. * math/bits/mathcalls.h (nextdown): Declare if [__GLIBC_USE (IEC_60559_BFP_EXT)], not [__USE_GNU]. (nextup): Likewise. (__issignaling): Likewise.
Diffstat (limited to 'math/math.h')
| -rw-r--r-- | math/math.h | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/math/math.h b/math/math.h index 4724b10b6f..ff9d70adf5 100644 --- a/math/math.h +++ b/math/math.h @@ -23,7 +23,8 @@ #ifndef _MATH_H #define _MATH_H 1 -#include <features.h> +#define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION +#include <bits/libc-header-start.h> __BEGIN_DECLS @@ -328,7 +329,7 @@ enum #endif /* Use ISO C99. */ -#ifdef __USE_GNU +#if __GLIBC_USE (IEC_60559_BFP_EXT) /* Return nonzero value if X is a signaling NaN. */ # ifdef __NO_LONG_DOUBLE_MATH # define issignaling(x) \ @@ -340,7 +341,7 @@ enum : sizeof (x) == sizeof (double) \ ? __issignaling (x) : __issignalingl (x)) # endif -#endif /* Use GNU. */ +#endif /* Use IEC_60559_BFP_EXT. */ #ifdef __USE_MISC /* Support for various different standard error handling behaviors. */ |