diff options
Diffstat (limited to 'include/shlib-compat.h')
| -rw-r--r-- | include/shlib-compat.h | 100 |
1 files changed, 0 insertions, 100 deletions
diff --git a/include/shlib-compat.h b/include/shlib-compat.h deleted file mode 100644 index 41eb362f1d..0000000000 --- a/include/shlib-compat.h +++ /dev/null @@ -1,100 +0,0 @@ -/* Macros for managing ABI-compatibility definitions using ELF symbol versions. - Copyright (C) 2000-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - <http://www.gnu.org/licenses/>. */ - -#ifndef _SHLIB_COMPAT_H -#define _SHLIB_COMPAT_H 1 - -# include <abi-versions.h> - -#ifdef SHARED - -/* The file abi-versions.h (generated by scripts/abi-versions.awk) defines - symbols like `ABI_libm_GLIBC_2_0' for each version set in the source - code for each library. For a version set that is subsumed by a later - version set, the definition gives the subsuming set, i.e. if GLIBC_2_0 - is subsumed by GLIBC_2_1, then ABI_libm_GLIBC_2_0 == ABI_libm_GLIBC_2_1. - Each version set that is to be distinctly defined in the output has an - unique positive integer value, increasing with newer versions. Thus, - evaluating two ABI_* symbols reduces to integer values that differ only - when the two version sets named are in fact two different ABIs we are - supporting. If these do not differ, then there is no need to compile in - extra code to support this version set where it has been superseded by a - newer version. The compatibility code should be conditionalized with - e.g. `#if SHLIB_COMPAT (libm, GLIBC_2_0, GLIBC_2_2)' for code introduced - in the GLIBC_2.0 version and obsoleted in the GLIBC_2.2 version. */ - -# define SHLIB_COMPAT(lib, introduced, obsoleted) \ - _SHLIB_COMPAT (lib, introduced, obsoleted) -# define _SHLIB_COMPAT(lib, introduced, obsoleted) \ - (IS_IN (lib) \ - && (!(ABI_##lib##_##obsoleted - 0) \ - || ((ABI_##lib##_##introduced - 0) < (ABI_##lib##_##obsoleted - 0)))) - -/* That header also defines symbols like `VERSION_libm_GLIBC_2_1' to - the version set name to use for e.g. symbols first introduced into - libm in the GLIBC_2.1 version. Definitions of symbols with explicit - versions should look like: - versioned_symbol (libm, new_foo, foo, GLIBC_2_1); - This will define the symbol `foo' with the appropriate default version, - i.e. either GLIBC_2.1 or the "earliest version" specified in - shlib-versions if that is newer. */ - -# define versioned_symbol(lib, local, symbol, version) \ - versioned_symbol_1 (lib, local, symbol, version) -# define versioned_symbol_1(lib, local, symbol, version) \ - versioned_symbol_2 (local, symbol, VERSION_##lib##_##version) -# define versioned_symbol_2(local, symbol, name) \ - default_symbol_version (local, symbol, name) - -# define compat_symbol(lib, local, symbol, version) \ - compat_symbol_reference (lib, local, symbol, version) - -#else - -/* Not compiling ELF shared libraries at all, so never any old versions. */ -# define SHLIB_COMPAT(lib, introduced, obsoleted) 0 - -/* No versions to worry about, just make this the global definition. */ -# define versioned_symbol(lib, local, symbol, version) \ - weak_alias (local, symbol) - -/* This should not appear outside `#if SHLIB_COMPAT (...)'. */ -# define compat_symbol(lib, local, symbol, version) ... - -#endif - -/* Use compat_symbol_reference for a reference to a specific version - of a symbol. Use compat_symbol to define such a symbol. */ -#define compat_symbol_reference(lib, local, symbol, version) \ - compat_symbol_reference_1 (lib, local, symbol, version) -#define compat_symbol_reference_1(lib, local, symbol, version) \ - compat_symbol_reference_2 (local, symbol, VERSION_##lib##_##version) -#define compat_symbol_reference_2(local, symbol, name) \ - symbol_version_reference (local, symbol, name) - -# ifdef LINK_OBSOLETE_RPC -/* Export the symbol for both static and dynamic linking. */ -# define libc_sunrpc_symbol(name, aliasname, version) \ - strong_alias (name, aliasname) -# else -/* Export the symbol only for shared-library compatibility. */ -# define libc_sunrpc_symbol(name, aliasname, version) \ - compat_symbol (libc, name, aliasname, version); -# endif - -#endif /* shlib-compat.h */ |