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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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12
ChangeLog
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@ -1,5 +1,17 @@
2016-08-03 Joseph Myers <joseph@codesourcery.com>
* 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].
* manual/arith.texi (nextup): Fix typo in last change.
2016-08-03 Zack Weinberg <zackw@panix.com>

5
NEWS
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@ -17,6 +17,11 @@ Version 2.25
from that TS. Note that most features from that TS are not supported by
the GNU C Library.
* The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
18661-4:2015, is supported to enable declarations of functions and macros
from that TS. Note that most features from that TS are not supported by
the GNU C Library.
* The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
means that in a future release, the macros “major”, “minor”, and “makedev”
will only be available from <sys/sysmacros.h>.

9
bits/libc-header-start.h
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@ -50,3 +50,12 @@
#else
# define __GLIBC_USE_IEC_60559_BFP_EXT 0
#endif
/* ISO/IEC TS 18661-4:2015 defines the
__STDC_WANT_IEC_60559_FUNCS_EXT__ macro. */
#undef __GLIBC_USE_IEC_60559_FUNCS_EXT
#if defined __USE_GNU || defined __STDC_WANT_IEC_60559_FUNCS_EXT__
# define __GLIBC_USE_IEC_60559_FUNCS_EXT 1
#else
# define __GLIBC_USE_IEC_60559_FUNCS_EXT 0
#endif

2
include/features.h
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@ -26,6 +26,8 @@
_ISOC11_SOURCE Extensions to ISO C99 from ISO C11.
__STDC_WANT_LIB_EXT2__ Extensions to ISO C99 from TR 27431-2:2010.
__STDC_WANT_IEC_60559_BFP_EXT__ Extensions to ISO C11 from TS 18661-1:2014.
__STDC_WANT_IEC_60559_FUNCS_EXT__ Extensions to ISO C11 from
TS 18661-4:2015.
_POSIX_SOURCE IEEE Std 1003.1.
_POSIX_C_SOURCE If ==1, like _POSIX_SOURCE; if >=2 add IEEE Std 1003.2;
if >=199309L, add IEEE Std 1003.1b-1993;

9
manual/creature.texi
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@ -182,6 +182,15 @@ are enabled. Only some of the features from this TS are supported by
@theglibc{}.
@end defvr
@comment (none)
@comment ISO
@defvr Macro __STDC_WANT_IEC_60559_FUNCS_EXT__
If you define this macro, features from ISO/IEC TS 18661-4:2015
(Floating-point extensions for C: Supplementary functions) are
enabled. Only some of the features from this TS are supported by
@theglibc{}.
@end defvr
@comment (none)
@comment GNU
@defvr Macro _GNU_SOURCE

9
manual/math.texi
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@ -480,13 +480,13 @@ Mathematically, @code{exp2 (x)} is the same as @code{exp (x * log (2))}.
@end deftypefun
@comment math.h
@comment GNU
@comment ISO
@deftypefun double exp10 (double @var{x})
@comment math.h
@comment GNU
@comment ISO
@deftypefunx float exp10f (float @var{x})
@comment math.h
@comment GNU
@comment ISO
@deftypefunx {long double} exp10l (long double @var{x})
@comment math.h
@comment GNU
@ -501,7 +501,8 @@ Mathematically, @code{exp2 (x)} is the same as @code{exp (x * log (2))}.
These functions compute @code{10} raised to the power @var{x}.
Mathematically, @code{exp10 (x)} is the same as @code{exp (x * log (10))}.
These functions are GNU extensions. The name @code{exp10} is
The @code{exp10} functions are from TS 18661-4:2015; the @code{pow10}
names are GNU extensions. The name @code{exp10} is
preferred, since it is analogous to @code{exp} and @code{exp2}.
@end deftypefun

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