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412cb261b0
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].
62 lines
2.3 KiB
C
62 lines
2.3 KiB
C
/* Handle feature test macros at the start of a header.
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Copyright (C) 2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* This header is internal to glibc and should not be included outside
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of glibc headers. Headers including it must define
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__GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION first. This header
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cannot have multiple include guards because ISO C feature test
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macros depend on the definition of the macro when an affected
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header is included, not when the first system header is
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included. */
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#ifndef __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION
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# error "Never include <bits/libc-header-start.h> directly."
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#endif
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#undef __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION
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#include <features.h>
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/* ISO/IEC TR 24731-2:2010 defines the __STDC_WANT_LIB_EXT2__
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macro. */
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#undef __GLIBC_USE_LIB_EXT2
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#if (defined __USE_GNU \
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|| (defined __STDC_WANT_LIB_EXT2__ && __STDC_WANT_LIB_EXT2__ > 0))
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# define __GLIBC_USE_LIB_EXT2 1
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#else
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# define __GLIBC_USE_LIB_EXT2 0
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#endif
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/* ISO/IEC TS 18661-1:2014 defines the __STDC_WANT_IEC_60559_BFP_EXT__
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macro. */
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#undef __GLIBC_USE_IEC_60559_BFP_EXT
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#if defined __USE_GNU || defined __STDC_WANT_IEC_60559_BFP_EXT__
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# define __GLIBC_USE_IEC_60559_BFP_EXT 1
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#else
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# define __GLIBC_USE_IEC_60559_BFP_EXT 0
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#endif
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/* ISO/IEC TS 18661-4:2015 defines the
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__STDC_WANT_IEC_60559_FUNCS_EXT__ macro. */
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#undef __GLIBC_USE_IEC_60559_FUNCS_EXT
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#if defined __USE_GNU || defined __STDC_WANT_IEC_60559_FUNCS_EXT__
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# define __GLIBC_USE_IEC_60559_FUNCS_EXT 1
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#else
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# define __GLIBC_USE_IEC_60559_FUNCS_EXT 0
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#endif
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