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libc-header-start.h
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/* Handle feature test macros at the start of a header. Copyright (C) 2016-2018 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 <http://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. */ #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 /* 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 /* 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