Edit: stdc-predef.h
/* Copyright (C) 1991-2018 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/>. */ #ifndef _STDC_PREDEF_H #define _STDC_PREDEF_H 1 /* This header is separate from features.h so that the compiler can include it implicitly at the start of every compilation. It must not itself include <features.h> or any other header that includes <features.h> because the implicit include comes before any feature test macros that may be defined in a source file before it first explicitly includes a system header. GCC knows the name of this header in order to preinclude it. */ /* glibc's intent is to support the IEC 559 math functionality, real and complex. If the GCC (4.9 and later) predefined macros specifying compiler intent are available, use them to determine whether the overall intent is to support these features; otherwise, presume an older compiler has intent to support these features and define these macros by default. */ #ifdef __GCC_IEC_559 # if __GCC_IEC_559 > 0 # define __STDC_IEC_559__ 1 # endif #else # define __STDC_IEC_559__ 1 #endif #ifdef __GCC_IEC_559_COMPLEX # if __GCC_IEC_559_COMPLEX > 0 # define __STDC_IEC_559_COMPLEX__ 1 # endif #else # define __STDC_IEC_559_COMPLEX__ 1 #endif /* wchar_t uses Unicode 10.0.0. Version 10.0 of the Unicode Standard is synchronized with ISO/IEC 10646:2017, fifth edition, plus the following additions from Amendment 1 to the fifth edition: - 56 emoji characters - 285 hentaigana - 3 additional Zanabazar Square characters */ #define __STDC_ISO_10646__ 201706L #endif
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