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1 | /* Macros for managing ABI-compatibility definitions using ELF symbol versions. |
2 | Copyright (C) 2000 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 Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | 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 | Library General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Library General Public | |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | #ifndef _SHLIB_COMPAT_H | |
21 | #define _SHLIB_COMPAT_H 1 | |
22 | ||
23 | #if defined HAVE_ELF && defined PIC && defined DO_VERSIONING | |
24 | ||
25 | #include <abi-versions.h> /* header generated by abi-versions.awk */ | |
26 | ||
27 | /* The file abi-versions.h (generated by scripts/abi-versions.awk) defines | |
28 | symbols like `ABI_libm_GLIBC_2_0' to either 1 or 0 indicating whether or | |
29 | not we want to build binary compatibility for e.g. the GLIBC_2.0 version | |
30 | set into the libm shared object. If this evaluates to zero, then there | |
31 | is no need to compile in extra code to support this version set where it | |
32 | has been superseded by a newer version. The compatibility code should | |
33 | be conditionalized with `#if SHLIB_COMPAT (libm, GLIBC_2_0)'. */ | |
34 | ||
35 | #define SHLIB_COMPAT(lib, version) ABI_##lib##_##version | |
36 | ||
37 | /* That header also defines symbols like `VERSION_libm_GLIBC_2_1' to | |
38 | the version set name to use for e.g. symbols first introduced into | |
39 | libm in the GLIBC_2.1 version. Definitions of symbols with explicit | |
40 | versions should look like: | |
41 | versioned_symbol (libm, new_foo, foo, GLIBC_2_1); | |
42 | This will define the symbol `foo' with the appropriate default version, | |
43 | i.e. either GLIBC_2.1 or the "earliest version" specified in | |
44 | shlib-versions if that is newer. */ | |
45 | ||
46 | #define versioned_symbol(lib, local, symbol, version) \ | |
47 | default_symbol_version (local, symbol, VERSION_##lib##_##version) | |
48 | ||
49 | #else | |
50 | ||
51 | /* Not compiling ELF shared libraries at all, so never any old versions. */ | |
52 | #define SHLIB_COMPAT(lib, version) 0 | |
53 | ||
54 | /* No versions to worry about, just make this the global definition. */ | |
55 | #define versioned_symbol(lib, local, symbol, version) \ | |
56 | weak_alias (local, symbol) | |
57 | ||
58 | #endif | |
59 | ||
60 | ||
61 | #endif /* shlib-compat.h */ |