1 files changed, 84 insertions, 0 deletions
diff --git a/newlib/libc/sys/linux/linuxthreads/shlib-compat.h b/newlib/libc/sys/linux/linuxthreads/shlib-compat.h
new file mode 100644
index 000000000..245b8aa89
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+++ b/newlib/libc/sys/linux/linuxthreads/shlib-compat.h
@@ -0,0 +1,84 @@
+/* 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 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, 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 DO_VERSIONING
+/* Since there is just one set of .d files generated, we need to
+   include this unconditionally to have the dependency noticed properly.  */
+#include <abi-versions.h>	/* header generated by abi-versions.awk */
+#endif
+
+#if defined HAVE_ELF && defined SHARED && defined DO_VERSIONING
+
+/* 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+   extra code to support this version set where it has been superseded by a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) \
+  (!(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 (local, symbol, VERSION_##lib##_##version)
+# define versioned_symbol_1(local, symbol, name) \
+  default_symbol_version (local, symbol, name)
+
+# define compat_symbol(lib, local, symbol, version) \
+  compat_symbol_1 (local, symbol, VERSION_##lib##_##version)
+# define compat_symbol_1(local, symbol, name) \
+  symbol_version (local, symbol, name)
+
+#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
+
+
+#endif	/* shlib-compat.h */