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Support __STDC_WANT_IEC_60559_FUNCS_EXT__ feature test macro.

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This patch implements support for the
__STDC_WANT_IEC_60559_FUNCS_EXT__ feature test macro, following the
__GLIBC_USE approach used for other ISO C feature test macros.
Currently this only affects the exp10 functions (which glibc has had
for a long time).

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_FUNCS_EXT): New
	macro.
	* include/features.h (__STDC_WANT_IEC_60559_FUNCS_EXT__):
	Document.
	* manual/creature.texi (__STDC_WANT_IEC_60559_FUNCS_EXT__):
	Document macro.
	* manual/math.texi (exp10): Document as ISO from TS 18661-4:2015.
	(exp10f): Likewise.
	(exp10l): Likewise.
	* math/bits/mathcalls.h (exp10): Declare if
	[__GLIBC_USE (IEC_60559_FUNCS_EXT)], not [__USE_GNU].
This commit is contained in:
Joseph Myers
2016-08-03 22:21:37 +00:00
parent 71b4804447
commit 412cb261b0
7 changed files with 46 additions and 6 deletions
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6
math/bits/mathcalls.h
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@ -115,9 +115,11 @@ __MATHCALL (log10,, (_Mdouble_ __x));
__MATHCALL (modf,, (_Mdouble_ __x, _Mdouble_ *__iptr)) __nonnull ((2));
_Mdouble_END_NAMESPACE
#ifdef __USE_GNU
/* A function missing in all standards: compute exponent to base ten. */
#if __GLIBC_USE (IEC_60559_FUNCS_EXT)
/* Compute exponent to base ten. */
__MATHCALL (exp10,, (_Mdouble_ __x));
#endif
#ifdef __USE_GNU
/* Another name occasionally used. */
__MATHCALL (pow10,, (_Mdouble_ __x));
#endif