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, 49 insertions, 0 deletions

diff --git a/REORG.TODO/nptl/pt-fork.c b/REORG.TODO/nptl/pt-fork.c
new file mode 100644
index 0000000000..a1493a0159
--- /dev/null
+++ b/REORG.TODO/nptl/pt-fork.c
@@ -0,0 +1,49 @@
+/* ABI compatibility for 'fork' symbol in libpthread ABI.
+   Copyright (C) 2002-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+   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/>.  */
+
+#include <unistd.h>
+#include <shlib-compat.h>
+
+/* libpthread once had its own fork, though there was no apparent reason
+   for it.  There is no use in having a separate symbol in libpthread, but
+   the historical ABI requires it.  For static linking, there is no need to
+   provide anything here--the libc version will be linked in.  For shared
+   library ABI compatibility, there must be __fork and fork symbols in
+   libpthread.so.
+
+   With an IFUNC resolver, it would be possible to avoid the
+   indirection, but the IFUNC resolver might run before the
+   __libc_fork symbol has been relocated, in which case the IFUNC
+   resolver would not be able to provide the correct address.  */
+
+#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_22)
+
+static pid_t __attribute__ ((used))
+fork_compat (void)
+{
+  return __libc_fork ();
+}
+
+strong_alias (fork_compat, fork_alias)
+compat_symbol (libpthread, fork_alias, fork, GLIBC_2_0);
+
+strong_alias (fork_compat, __fork_alias)
+compat_symbol (libpthread, __fork_alias, __fork, GLIBC_2_0);
+
+#endif