From 412cb261b0d66ef5251d7d1c8276b5c522d943b7 Mon Sep 17 00:00:00 2001
From: Joseph Myers <joseph@codesourcery.com>
Date: Wed, 3 Aug 2016 22:21:37 +0000
Subject: Support __STDC_WANT_IEC_60559_FUNCS_EXT__ feature test macro.

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].
---
 manual/creature.texi | 9 +++++++++
 manual/math.texi     | 9 +++++----
 2 files changed, 14 insertions(+), 4 deletions(-)

(limited to 'manual')

diff --git a/manual/creature.texi b/manual/creature.texi
index 61b17ce22b..257f8718b1 100644
--- a/manual/creature.texi
+++ b/manual/creature.texi
@@ -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
diff --git a/manual/math.texi b/manual/math.texi
index 5c9f7b9f1c..d689820c6c 100644
--- a/manual/math.texi
+++ b/manual/math.texi
@@ -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
 
-- 
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