Prepare for radical source tree reorganization. zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 100 insertions, 0 deletions

diff --git a/REORG.TODO/include/shlib-compat.h b/REORG.TODO/include/shlib-compat.h
new file mode 100644
index 0000000000..41eb362f1d
--- /dev/null
+++ b/REORG.TODO/include/shlib-compat.h
@@ -0,0 +1,100 @@
+/* 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 */