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361742eda9
supported version for libc 0.2.90.libio to GLIBC_2.2. * Makeconfig (soversions.mk): Grok new third column in shlib-versions, and use it to emit new variable `map-firstversions'. * scripts/firstversions.awk: New file. * Makerules (Versions.all): Use scripts/firstversions.awk and the $(map-firstversions) value to generate a modified versions list that includes renames in "A = B" syntax for each version set earlier than the "earliest symbol version" named in shlib-versions. * scripts/versions.awk: Recognize "A = B" lines in the input to mean rename version set A to B in the output to the intermediate file. * scripts/abi-versions.awk: New file. * Makerules (abi-versions.h): New target, generated by that script. [$(versioning) = yes] (before-compile): Prepend abi-versions.h. * include/shlib-compat.h: New file, uses that generated header.
62 lines
2.6 KiB
C
62 lines
2.6 KiB
C
/* Macros for managing ABI-compatibility definitions using ELF symbol versions.
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Copyright (C) 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef _SHLIB_COMPAT_H
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#define _SHLIB_COMPAT_H 1
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#if defined HAVE_ELF && defined PIC && defined DO_VERSIONING
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#include <abi-versions.h> /* header generated by abi-versions.awk */
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/* The file abi-versions.h (generated by scripts/abi-versions.awk) defines
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symbols like `ABI_libm_GLIBC_2_0' to either 1 or 0 indicating whether or
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not we want to build binary compatibility for e.g. the GLIBC_2.0 version
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set into the libm shared object. If this evaluates to zero, then there
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is no need to compile in extra code to support this version set where it
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has been superseded by a newer version. The compatibility code should
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be conditionalized with `#if SHLIB_COMPAT (libm, GLIBC_2_0)'. */
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#define SHLIB_COMPAT(lib, version) ABI_##lib##_##version
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/* That header also defines symbols like `VERSION_libm_GLIBC_2_1' to
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the version set name to use for e.g. symbols first introduced into
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libm in the GLIBC_2.1 version. Definitions of symbols with explicit
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versions should look like:
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versioned_symbol (libm, new_foo, foo, GLIBC_2_1);
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This will define the symbol `foo' with the appropriate default version,
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i.e. either GLIBC_2.1 or the "earliest version" specified in
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shlib-versions if that is newer. */
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#define versioned_symbol(lib, local, symbol, version) \
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default_symbol_version (local, symbol, VERSION_##lib##_##version)
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#else
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/* Not compiling ELF shared libraries at all, so never any old versions. */
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#define SHLIB_COMPAT(lib, version) 0
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/* No versions to worry about, just make this the global definition. */
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#define versioned_symbol(lib, local, symbol, version) \
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weak_alias (local, symbol)
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#endif
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#endif /* shlib-compat.h */
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