resolv: Move libanl into libc (if libpthread is in libc)

The symbols gai_cancel, gai_error, gai_suspend, getaddrinfo_a,
__gai_suspend_time64 were moved using scripts/move-symbol-to-libc.py.

For Hurd (which remains !PTHREAD_IN_LIBC), a few #define redirects
had to be added because several pthread functions are not available
under __.  (Linux uses __ prefixes for most hidden aliases, and has
to in some cases to avoid linknamespace issues.)

1 files changed, 35 insertions, 0 deletions

diff --git a/resolv/libanl-compat.c b/resolv/libanl-compat.c
new file mode 100644
index 0000000000..29df76f278
--- /dev/null
+++ b/resolv/libanl-compat.c
@@ -0,0 +1,35 @@
+/* Placeholder compatibility symbols for libanl.
+   Copyright (C) 2021 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
+   <https://www.gnu.org/licenses/>.  */
+
+#if PTHREAD_IN_LIBC
+# include <shlib-compat.h>
+# include <sys/cdefs.h>
+
+/* This file is used to keep specific symbol versions occupied, so
+   that ld does not generate weak symbol version definitions.  */
+
+void
+attribute_compat_text_section
+__attribute_used__
+__libanl_version_placeholder_1 (void)
+{
+}
+
+compat_symbol (libanl, __libanl_version_placeholder_1,
+               __libanl_version_placeholder, GLIBC_2_2_3);
+#endif