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authorRoland McGrath <roland@gnu.org>2000-03-19 20:36:44 +0000
committerRoland McGrath <roland@gnu.org>2000-03-19 20:36:44 +0000
commit361742eda986901daf75169faaf648d4d132ccfb (patch)
treea5d99df3b839ac0fd99cf17886ea35b900d16039 /include
parent882688521994c2329242212a61dd2a7c44eadbc6 (diff)
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* shlib-versions [USE_IN_LIBIO] (.*-.*-gnu-gnu*): Set earliest
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.
Diffstat (limited to 'include')
-rw-r--r--include/shlib-compat.h61
1 files changed, 61 insertions, 0 deletions
diff --git a/include/shlib-compat.h b/include/shlib-compat.h
new file mode 100644
index 0000000000..50fba1b957
--- /dev/null
+++ b/include/shlib-compat.h
@@ -0,0 +1,61 @@
+/* Macros for managing ABI-compatibility definitions using ELF symbol versions.
+ Copyright (C) 2000 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 Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#ifndef _SHLIB_COMPAT_H
+#define _SHLIB_COMPAT_H 1
+
+#if defined HAVE_ELF && defined PIC && defined DO_VERSIONING
+
+#include <abi-versions.h> /* header generated by abi-versions.awk */
+
+/* The file abi-versions.h (generated by scripts/abi-versions.awk) defines
+ symbols like `ABI_libm_GLIBC_2_0' to either 1 or 0 indicating whether or
+ not we want to build binary compatibility for e.g. the GLIBC_2.0 version
+ set into the libm shared object. If this evaluates to zero, 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 `#if SHLIB_COMPAT (libm, GLIBC_2_0)'. */
+
+#define SHLIB_COMPAT(lib, version) ABI_##lib##_##version
+
+/* 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) \
+ default_symbol_version (local, symbol, VERSION_##lib##_##version)
+
+#else
+
+/* Not compiling ELF shared libraries at all, so never any old versions. */
+#define SHLIB_COMPAT(lib, version) 0
+
+/* No versions to worry about, just make this the global definition. */
+#define versioned_symbol(lib, local, symbol, version) \
+ weak_alias (local, symbol)
+
+#endif
+
+
+#endif /* shlib-compat.h */