[beast/temp-rc1] BUILD: link with -Bsymbolic-functions to optimize ELF relocations

[Tim Janik <timj src gnome org>]

commit c2f6ac0135db3d891da8db9f17e3829f6cb501a9
Author: Tim Janik <timj gnu org>
Date:   Fri Oct 17 02:21:37 2014 +0200

    BUILD: link with -Bsymbolic-functions to optimize ELF relocations

 ld-symbolic.m4 |   45 +++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 45 insertions(+), 0 deletions(-)
---
diff --git a/ld-symbolic.m4 b/ld-symbolic.m4
new file mode 100644
index 0000000..16d64f9
--- /dev/null
+++ b/ld-symbolic.m4
@@ -0,0 +1,45 @@
+dnl Copyright (C) 2007 Free Software Foundation, Inc.
+dnl This file is free software, distributed under the terms of the GNU
+dnl General Public License.  As a special exception to the GNU General
+dnl Public License, this file may be distributed as part of a program
+dnl that contains a configuration script generated by Autoconf, under
+dnl the same distribution terms as the rest of that program.
+
+dnl Set SYMBOLIC_LDFLAGS to -Bsymbolic-functions for GNU linker if it
+dnl is supported.
+AC_DEFUN([ACX_PROG_LD_GNU_SYMBOLIC],
+[AC_CACHE_CHECK([if the GNU linker ($LD) supports -Bsymbolic-functions],
+acl_cv_prog_gnu_ld_symbolic, [
+acl_cv_prog_gnu_ld_symbolic=no
+AC_REQUIRE([AC_LIB_PROG_LD_GNU])
+if test x"$with_gnu_ld" = x"yes"; then
+  if $LD --help 2>&1 </dev/null | grep Bsymbolic-functions 1>&5; then
+    acl_cv_prog_gnu_ld_symbolic=yes
+  fi
+fi])
+if test x"$acl_cv_prog_gnu_ld_symbolic" = x"yes"; then
+  SYMBOLIC_LDFLAGS="-Wl,-Bsymbolic-functions"
+else
+  SYMBOLIC_LDFLAGS=''
+fi
+])
+
+dnl Set DYNAMIC_LIST_CPP_NEW_LDFLAGS to --dynamic-list-cpp-new for GNU
+dnl linker if it is supported.
+AC_DEFUN([ACX_PROG_LD_GNU_DYNAMIC_LIST_CPP_NEW],
+[AC_CACHE_CHECK([if the GNU linker ($LD) supports --dynamic-list-cpp-new],
+acl_cv_prog_gnu_ld_dynamic_list_cpp_new, [
+acl_cv_prog_gnu_ld_dynamic_list_cpp_new=no
+AC_REQUIRE([ACX_PROG_LD_GNU_SYMBOLIC])
+if test x"$with_gnu_ld" = x"yes" -a \
+       x"$acl_cv_prog_gnu_ld_symbolic" = x"yes"; then
+  if $LD --help 2>&1 </dev/null | grep dynamic-list-cpp-new 1>&5; then
+    acl_cv_prog_gnu_ld_dynamic_list_cpp_new=yes
+  fi
+fi])
+if test x"$acl_cv_prog_gnu_ld_dynamic_list_cpp_new" = x"yes"; then
+   DYNAMIC_LIST_CPP_NEW_LDFLAGS="$SYMBOLIC_LDFLAGS -Wl,--dynamic-list-cpp-new"
+else
+   DYNAMIC_LIST_CPP_NEW_LDFLAGS=''
+fi
+])