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- /* Handle feature test macros at the start of a header.
- Copyright (C) 2016-2021 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <https://www.gnu.org/licenses/>. */
- /* This header is internal to glibc and should not be included outside
- of glibc headers. Headers including it must define
- __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION first. This header
- cannot have multiple include guards because ISO C feature test
- macros depend on the definition of the macro when an affected
- header is included, not when the first system header is
- included. */
- #ifndef __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION
- # error "Never include <bits/libc-header-start.h> directly."
- #endif
- #undef __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION
- #include <features.h>
- /* ISO/IEC TR 24731-2:2010 defines the __STDC_WANT_LIB_EXT2__
- macro. */
- #undef __GLIBC_USE_LIB_EXT2
- #if (defined __USE_GNU \
- || (defined __STDC_WANT_LIB_EXT2__ && __STDC_WANT_LIB_EXT2__ > 0))
- # define __GLIBC_USE_LIB_EXT2 1
- #else
- # define __GLIBC_USE_LIB_EXT2 0
- #endif
- /* ISO/IEC TS 18661-1:2014 defines the __STDC_WANT_IEC_60559_BFP_EXT__
- macro. Most but not all symbols enabled by that macro in TS
- 18661-1 are enabled unconditionally in C2X; the symbols in Annex F
- still require that macro in C2X. */
- #undef __GLIBC_USE_IEC_60559_BFP_EXT
- #if defined __USE_GNU || defined __STDC_WANT_IEC_60559_BFP_EXT__
- # define __GLIBC_USE_IEC_60559_BFP_EXT 1
- #else
- # define __GLIBC_USE_IEC_60559_BFP_EXT 0
- #endif
- #undef __GLIBC_USE_IEC_60559_BFP_EXT_C2X
- #if __GLIBC_USE (IEC_60559_BFP_EXT) || __GLIBC_USE (ISOC2X)
- # define __GLIBC_USE_IEC_60559_BFP_EXT_C2X 1
- #else
- # define __GLIBC_USE_IEC_60559_BFP_EXT_C2X 0
- #endif
- /* ISO/IEC TS 18661-4:2015 defines the
- __STDC_WANT_IEC_60559_FUNCS_EXT__ macro. Other than the reduction
- functions, the symbols from this TS are enabled unconditionally in
- C2X. */
- #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
- #undef __GLIBC_USE_IEC_60559_FUNCS_EXT_C2X
- #if __GLIBC_USE (IEC_60559_FUNCS_EXT) || __GLIBC_USE (ISOC2X)
- # define __GLIBC_USE_IEC_60559_FUNCS_EXT_C2X 1
- #else
- # define __GLIBC_USE_IEC_60559_FUNCS_EXT_C2X 0
- #endif
- /* ISO/IEC TS 18661-3:2015 defines the
- __STDC_WANT_IEC_60559_TYPES_EXT__ macro. */
- #undef __GLIBC_USE_IEC_60559_TYPES_EXT
- #if defined __USE_GNU || defined __STDC_WANT_IEC_60559_TYPES_EXT__
- # define __GLIBC_USE_IEC_60559_TYPES_EXT 1
- #else
- # define __GLIBC_USE_IEC_60559_TYPES_EXT 0
- #endif
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