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 | |