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42cc619dfb
WG14 decided to use the name C23 as the informal name of the next revision of the C standard (notwithstanding the publication date in 2024). Update references to C2X in glibc to use the C23 name. This is intended to update everything *except* where it involves renaming files (the changes involving renaming tests are intended to be done separately). In the case of the _ISOC2X_SOURCE feature test macro - the only user-visible interface involved - support for that macro is kept for backwards compatibility, while adding _ISOC23_SOURCE. Tested for x86_64.
111 lines
4.2 KiB
C
111 lines
4.2 KiB
C
/* Handle feature test macros at the start of a header.
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Copyright (C) 2016-2024 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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<https://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. Most but not all symbols enabled by that macro in TS
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18661-1 are enabled unconditionally in C23. In C23, the symbols in
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Annex F still require a new feature test macro
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__STDC_WANT_IEC_60559_EXT__ instead (C23 does not define
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__STDC_WANT_IEC_60559_BFP_EXT__), while a few features from TS
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18661-1 are not included in C23 (and thus should depend on
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__STDC_WANT_IEC_60559_BFP_EXT__ even when C23 features are
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enabled).
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__GLIBC_USE (IEC_60559_BFP_EXT) controls those features from TS
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18661-1 not included in C23.
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__GLIBC_USE (IEC_60559_BFP_EXT_C23) controls those features from TS
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18661-1 that are also included in C23 (with no feature test macro
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required in C23).
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__GLIBC_USE (IEC_60559_EXT) controls those features from TS 18661-1
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that are included in C23 but conditional on
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__STDC_WANT_IEC_60559_EXT__. (There are currently no features
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conditional on __STDC_WANT_IEC_60559_EXT__ that are not in TS
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18661-1.) */
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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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#undef __GLIBC_USE_IEC_60559_BFP_EXT_C23
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#if __GLIBC_USE (IEC_60559_BFP_EXT) || __GLIBC_USE (ISOC23)
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# define __GLIBC_USE_IEC_60559_BFP_EXT_C23 1
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#else
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# define __GLIBC_USE_IEC_60559_BFP_EXT_C23 0
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#endif
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#undef __GLIBC_USE_IEC_60559_EXT
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#if __GLIBC_USE (IEC_60559_BFP_EXT) || defined __STDC_WANT_IEC_60559_EXT__
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# define __GLIBC_USE_IEC_60559_EXT 1
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#else
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# define __GLIBC_USE_IEC_60559_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. Other than the reduction
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functions, the symbols from this TS are enabled unconditionally in
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C23. */
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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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#undef __GLIBC_USE_IEC_60559_FUNCS_EXT_C23
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#if __GLIBC_USE (IEC_60559_FUNCS_EXT) || __GLIBC_USE (ISOC23)
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# define __GLIBC_USE_IEC_60559_FUNCS_EXT_C23 1
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#else
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# define __GLIBC_USE_IEC_60559_FUNCS_EXT_C23 0
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#endif
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/* ISO/IEC TS 18661-3:2015 defines the
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__STDC_WANT_IEC_60559_TYPES_EXT__ macro. */
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#undef __GLIBC_USE_IEC_60559_TYPES_EXT
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#if defined __USE_GNU || defined __STDC_WANT_IEC_60559_TYPES_EXT__
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# define __GLIBC_USE_IEC_60559_TYPES_EXT 1
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#else
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# define __GLIBC_USE_IEC_60559_TYPES_EXT 0
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#endif
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