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d709042a | 1 | /* ABI compatibility for lgamma functions. |
f7a9f785 | 2 | Copyright (C) 2015-2016 Free Software Foundation, Inc. |
d709042a JM |
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 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #ifndef LGAMMA_COMPAT_H | |
20 | #define LGAMMA_COMPAT_H 1 | |
21 | ||
22 | #include <shlib-compat.h> | |
23 | ||
24 | /* XSI POSIX requires lgamma to set signgam, but ISO C does not permit | |
25 | this. Namespace issues can be avoided if the functions set | |
26 | __signgam and signgam is a weak alias, but this only works if both | |
27 | signgam and __signgam were exported from the glibc version the | |
28 | program was linked against. Before glibc 2.23, lgamma functions | |
29 | set signgam which was not a weak alias for __signgam, so old | |
30 | binaries have dynamic symbols for signgam only and the versions of | |
31 | lgamma used for old binaries must set both signgam and __signgam. | |
32 | Those versions also do a check of _LIB_VERSION != _ISOC_ to match | |
33 | old glibc. | |
34 | ||
35 | Users of this file define USE_AS_COMPAT to 0 when building the main | |
36 | version of lgamma, 1 when building the compatibility version. */ | |
37 | ||
38 | #define LGAMMA_OLD_VER GLIBC_2_0 | |
39 | #define LGAMMA_NEW_VER GLIBC_2_23 | |
40 | #define HAVE_LGAMMA_COMPAT SHLIB_COMPAT (libm, LGAMMA_OLD_VER, LGAMMA_NEW_VER) | |
41 | ||
42 | /* Whether to build this version at all. */ | |
43 | #define BUILD_LGAMMA (HAVE_LGAMMA_COMPAT || !USE_AS_COMPAT) | |
44 | ||
45 | /* The name to use for this version. */ | |
46 | #if USE_AS_COMPAT | |
47 | # define LGFUNC(FUNC) FUNC ## _compat | |
48 | #else | |
49 | # define LGFUNC(FUNC) FUNC | |
50 | #endif | |
51 | ||
52 | /* If there is a compatibility version, gamma (not an ISO C function, | |
53 | so never a problem for it to set signgam) points directly to it | |
54 | rather than having separate versions. */ | |
55 | #define GAMMA_ALIAS (USE_AS_COMPAT ? HAVE_LGAMMA_COMPAT : !HAVE_LGAMMA_COMPAT) | |
56 | ||
57 | /* How to call the underlying lgamma_r function. */ | |
58 | #define CALL_LGAMMA(TYPE, FUNC, ARG) \ | |
59 | ({ \ | |
60 | TYPE lgamma_tmp; \ | |
61 | int local_signgam; \ | |
62 | if (USE_AS_COMPAT) \ | |
63 | { \ | |
64 | lgamma_tmp = FUNC ((ARG), &local_signgam); \ | |
65 | if (_LIB_VERSION != _ISOC_) \ | |
66 | signgam = __signgam = local_signgam; \ | |
67 | } \ | |
68 | else \ | |
69 | lgamma_tmp = FUNC ((ARG), &__signgam); \ | |
70 | lgamma_tmp; \ | |
71 | }) | |
72 | ||
73 | #endif /* lgamma-compat.h. */ |