Current File : //usr/include/x86_64-linux-gnu/bits/libc-header-start.h
/* Handle feature test macros at the start of a header.
Copyright (C) 2016-2024 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. In C2X, the symbols in
Annex F still require a new feature test macro
__STDC_WANT_IEC_60559_EXT__ instead (C2X does not define
__STDC_WANT_IEC_60559_BFP_EXT__), while a few features from TS
18661-1 are not included in C2X (and thus should depend on
__STDC_WANT_IEC_60559_BFP_EXT__ even when C2X features are
enabled).
__GLIBC_USE (IEC_60559_BFP_EXT) controls those features from TS
18661-1 not included in C2X.
__GLIBC_USE (IEC_60559_BFP_EXT_C2X) controls those features from TS
18661-1 that are also included in C2X (with no feature test macro
required in C2X).
__GLIBC_USE (IEC_60559_EXT) controls those features from TS 18661-1
that are included in C2X but conditional on
__STDC_WANT_IEC_60559_EXT__. (There are currently no features
conditional on __STDC_WANT_IEC_60559_EXT__ that are not in TS
18661-1.) */
#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
#undef __GLIBC_USE_IEC_60559_EXT
#if __GLIBC_USE (IEC_60559_BFP_EXT) || defined __STDC_WANT_IEC_60559_EXT__
# define __GLIBC_USE_IEC_60559_EXT 1
#else
# define __GLIBC_USE_IEC_60559_EXT 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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