1/* Handle feature test macros at the start of a header. 
2 Copyright (C) 2016-2020 Free Software Foundation, Inc. 
3 This file is part of the GNU C Library. 
4 
5 The GNU C Library is free software; you can redistribute it and/or 
6 modify it under the terms of the GNU Lesser General Public 
7 License as published by the Free Software Foundation; either 
8 version 2.1 of the License, or (at your option) any later version. 
9 
10 The GNU C Library is distributed in the hope that it will be useful, 
11 but WITHOUT ANY WARRANTY; without even the implied warranty of 
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 
13 Lesser General Public License for more details. 
14 
15 You should have received a copy of the GNU Lesser General Public 
16 License along with the GNU C Library; if not, see 
17 <https://www.gnu.org/licenses/>. */ 
18 
19/* This header is internal to glibc and should not be included outside 
20 of glibc headers. Headers including it must define 
21 __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION first. This header 
22 cannot have multiple include guards because ISO C feature test 
23 macros depend on the definition of the macro when an affected 
24 header is included, not when the first system header is 
25 included. */ 
26 
27#ifndef __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION 
28# error "Never include <bits/libc-header-start.h> directly." 
29#endif 
30 
31#undef __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION 
32 
33#include <features.h> 
34 
35/* ISO/IEC TR 24731-2:2010 defines the __STDC_WANT_LIB_EXT2__ 
36 macro. */ 
37#undef __GLIBC_USE_LIB_EXT2 
38#if (defined __USE_GNU \ 
39 || (defined __STDC_WANT_LIB_EXT2__ && __STDC_WANT_LIB_EXT2__ > 0)) 
40# define __GLIBC_USE_LIB_EXT2 1 
41#else 
42# define __GLIBC_USE_LIB_EXT2 0 
43#endif 
44 
45/* ISO/IEC TS 18661-1:2014 defines the __STDC_WANT_IEC_60559_BFP_EXT__ 
46 macro. Most but not all symbols enabled by that macro in TS 
47 18661-1 are enabled unconditionally in C2X; the symbols in Annex F 
48 still require that macro in C2X. */ 
49#undef __GLIBC_USE_IEC_60559_BFP_EXT 
50#if defined __USE_GNU || defined __STDC_WANT_IEC_60559_BFP_EXT__ 
51# define __GLIBC_USE_IEC_60559_BFP_EXT 1 
52#else 
53# define __GLIBC_USE_IEC_60559_BFP_EXT 0 
54#endif 
55#undef __GLIBC_USE_IEC_60559_BFP_EXT_C2X 
56#if __GLIBC_USE (IEC_60559_BFP_EXT) || __GLIBC_USE (ISOC2X) 
57# define __GLIBC_USE_IEC_60559_BFP_EXT_C2X 1 
58#else 
59# define __GLIBC_USE_IEC_60559_BFP_EXT_C2X 0 
60#endif 
61 
62/* ISO/IEC TS 18661-4:2015 defines the 
63 __STDC_WANT_IEC_60559_FUNCS_EXT__ macro. Other than the reduction 
64 functions, the symbols from this TS are enabled unconditionally in 
65 C2X. */ 
66#undef __GLIBC_USE_IEC_60559_FUNCS_EXT 
67#if defined __USE_GNU || defined __STDC_WANT_IEC_60559_FUNCS_EXT__ 
68# define __GLIBC_USE_IEC_60559_FUNCS_EXT 1 
69#else 
70# define __GLIBC_USE_IEC_60559_FUNCS_EXT 0 
71#endif 
72#undef __GLIBC_USE_IEC_60559_FUNCS_EXT_C2X 
73#if __GLIBC_USE (IEC_60559_FUNCS_EXT) || __GLIBC_USE (ISOC2X) 
74# define __GLIBC_USE_IEC_60559_FUNCS_EXT_C2X 1 
75#else 
76# define __GLIBC_USE_IEC_60559_FUNCS_EXT_C2X 0 
77#endif 
78 
79/* ISO/IEC TS 18661-3:2015 defines the 
80 __STDC_WANT_IEC_60559_TYPES_EXT__ macro. */ 
81#undef __GLIBC_USE_IEC_60559_TYPES_EXT 
82#if defined __USE_GNU || defined __STDC_WANT_IEC_60559_TYPES_EXT__ 
83# define __GLIBC_USE_IEC_60559_TYPES_EXT 1 
84#else 
85# define __GLIBC_USE_IEC_60559_TYPES_EXT 0 
86#endif 
87