| 1 | /* Handle feature test macros at the start of a header. |
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| 2 | Copyright (C) 2016-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | /* This header is internal to glibc and should not be included outside |
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| 20 | of glibc headers. Headers including it must define |
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| 21 | __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION first. This header |
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| 22 | cannot have multiple include guards because ISO C feature test |
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| 23 | macros depend on the definition of the macro when an affected |
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| 24 | header is included, not when the first system header is |
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| 25 | included. */ |
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| 26 | |
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| 27 | #ifndef __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION |
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| 28 | # error "Never include <bits/libc-header-start.h> directly." |
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| 29 | #endif |
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| 30 | |
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| 31 | #undef __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION |
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| 32 | |
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| 33 | #include <features.h> |
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| 34 | |
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| 35 | /* ISO/IEC TR 24731-2:2010 defines the __STDC_WANT_LIB_EXT2__ |
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| 36 | macro. */ |
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| 37 | #undef __GLIBC_USE_LIB_EXT2 |
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| 38 | #if (defined __USE_GNU \ |
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| 39 | || (defined __STDC_WANT_LIB_EXT2__ && __STDC_WANT_LIB_EXT2__ > 0)) |
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| 40 | # define __GLIBC_USE_LIB_EXT2 1 |
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| 41 | #else |
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| 42 | # define __GLIBC_USE_LIB_EXT2 0 |
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| 43 | #endif |
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| 44 | |
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| 45 | /* ISO/IEC TS 18661-1:2014 defines the __STDC_WANT_IEC_60559_BFP_EXT__ |
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| 46 | macro. Most but not all symbols enabled by that macro in TS |
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| 47 | 18661-1 are enabled unconditionally in C2X. In C2X, the symbols in |
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| 48 | Annex F still require a new feature test macro |
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| 49 | __STDC_WANT_IEC_60559_EXT__ instead (C2X does not define |
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| 50 | __STDC_WANT_IEC_60559_BFP_EXT__), while a few features from TS |
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| 51 | 18661-1 are not included in C2X (and thus should depend on |
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| 52 | __STDC_WANT_IEC_60559_BFP_EXT__ even when C2X features are |
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| 53 | enabled). |
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| 54 | |
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| 55 | __GLIBC_USE (IEC_60559_BFP_EXT) controls those features from TS |
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| 56 | 18661-1 not included in C2X. |
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| 57 | |
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| 58 | __GLIBC_USE (IEC_60559_BFP_EXT_C2X) controls those features from TS |
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| 59 | 18661-1 that are also included in C2X (with no feature test macro |
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| 60 | required in C2X). |
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| 61 | |
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| 62 | __GLIBC_USE (IEC_60559_EXT) controls those features from TS 18661-1 |
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| 63 | that are included in C2X but conditional on |
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| 64 | __STDC_WANT_IEC_60559_EXT__. (There are currently no features |
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| 65 | conditional on __STDC_WANT_IEC_60559_EXT__ that are not in TS |
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| 66 | 18661-1.) */ |
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| 67 | #undef __GLIBC_USE_IEC_60559_BFP_EXT |
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| 68 | #if defined __USE_GNU || defined __STDC_WANT_IEC_60559_BFP_EXT__ |
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| 69 | # define __GLIBC_USE_IEC_60559_BFP_EXT 1 |
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| 70 | #else |
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| 71 | # define __GLIBC_USE_IEC_60559_BFP_EXT 0 |
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| 72 | #endif |
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| 73 | #undef __GLIBC_USE_IEC_60559_BFP_EXT_C2X |
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| 74 | #if __GLIBC_USE (IEC_60559_BFP_EXT) || __GLIBC_USE (ISOC2X) |
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| 75 | # define __GLIBC_USE_IEC_60559_BFP_EXT_C2X 1 |
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| 76 | #else |
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| 77 | # define __GLIBC_USE_IEC_60559_BFP_EXT_C2X 0 |
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| 78 | #endif |
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| 79 | #undef __GLIBC_USE_IEC_60559_EXT |
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| 80 | #if __GLIBC_USE (IEC_60559_BFP_EXT) || defined __STDC_WANT_IEC_60559_EXT__ |
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| 81 | # define __GLIBC_USE_IEC_60559_EXT 1 |
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| 82 | #else |
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| 83 | # define __GLIBC_USE_IEC_60559_EXT 0 |
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| 84 | #endif |
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| 85 | |
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| 86 | /* ISO/IEC TS 18661-4:2015 defines the |
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| 87 | __STDC_WANT_IEC_60559_FUNCS_EXT__ macro. Other than the reduction |
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| 88 | functions, the symbols from this TS are enabled unconditionally in |
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| 89 | C2X. */ |
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| 90 | #undef __GLIBC_USE_IEC_60559_FUNCS_EXT |
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| 91 | #if defined __USE_GNU || defined __STDC_WANT_IEC_60559_FUNCS_EXT__ |
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| 92 | # define __GLIBC_USE_IEC_60559_FUNCS_EXT 1 |
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| 93 | #else |
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| 94 | # define __GLIBC_USE_IEC_60559_FUNCS_EXT 0 |
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| 95 | #endif |
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| 96 | #undef __GLIBC_USE_IEC_60559_FUNCS_EXT_C2X |
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| 97 | #if __GLIBC_USE (IEC_60559_FUNCS_EXT) || __GLIBC_USE (ISOC2X) |
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| 98 | # define __GLIBC_USE_IEC_60559_FUNCS_EXT_C2X 1 |
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| 99 | #else |
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| 100 | # define __GLIBC_USE_IEC_60559_FUNCS_EXT_C2X 0 |
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| 101 | #endif |
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| 102 | |
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| 103 | /* ISO/IEC TS 18661-3:2015 defines the |
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| 104 | __STDC_WANT_IEC_60559_TYPES_EXT__ macro. */ |
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| 105 | #undef __GLIBC_USE_IEC_60559_TYPES_EXT |
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| 106 | #if defined __USE_GNU || defined __STDC_WANT_IEC_60559_TYPES_EXT__ |
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| 107 | # define __GLIBC_USE_IEC_60559_TYPES_EXT 1 |
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| 108 | #else |
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| 109 | # define __GLIBC_USE_IEC_60559_TYPES_EXT 0 |
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| 110 | #endif |
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| 111 | |
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