config/ld-symbolic.m4

   1 dnl Copyright (C) 2007 Free Software Foundation, Inc.
   2 dnl This file is free software, distributed under the terms of the GNU
   3 dnl General Public License.  As a special exception to the GNU General
   4 dnl Public License, this file may be distributed as part of a program
   5 dnl that contains a configuration script generated by Autoconf, under
   6 dnl the same distribution terms as the rest of that program.
   7
   8 dnl Set SYMBOLIC_LDFLAGS to -Bsymbolic-functions for GNU linker if it
   9 dnl is supported.
  10 AC_DEFUN([ACX_PROG_LD_GNU_SYMBOLIC],
  11 [AC_CACHE_CHECK([if the GNU linker ($LD) supports -Bsymbolic-functions],
  12 acl_cv_prog_gnu_ld_symbolic, [
  13 acl_cv_prog_gnu_ld_symbolic=no
  14 AC_REQUIRE([AC_LIB_PROG_LD_GNU])
  15 if test x"$with_gnu_ld" = x"yes"; then
  16   if $LD --help 2>&1 </dev/null | grep Bsymbolic-functions 1>&5; then
  17     acl_cv_prog_gnu_ld_symbolic=yes
  18   fi
  19 fi])
  20 if test x"$acl_cv_prog_gnu_ld_symbolic" = x"yes"; then
  21   SYMBOLIC_LDFLAGS="-Wl,-Bsymbolic-functions"
  22 else
  23   SYMBOLIC_LDFLAGS=''
  24 fi
  25 ])
  26
  27 dnl Set DYNAMIC_LIST_CPP_NEW_LDFLAGS to --dynamic-list-cpp-new for GNU
  28 dnl linker if it is supported.
  29 AC_DEFUN([ACX_PROG_LD_GNU_DYNAMIC_LIST_CPP_NEW],
  30 [AC_CACHE_CHECK([if the GNU linker ($LD) supports --dynamic-list-cpp-new],
  31 acl_cv_prog_gnu_ld_dynamic_list_cpp_new, [
  32 acl_cv_prog_gnu_ld_dynamic_list_cpp_new=no
  33 AC_REQUIRE([ACX_PROG_LD_GNU_SYMBOLIC])
  34 if test x"$with_gnu_ld" = x"yes" -a \
  35         x"$acl_cv_prog_gnu_ld_symbolic" = x"yes"; then
  36   if $LD --help 2>&1 </dev/null | grep dynamic-list-cpp-new 1>&5; then
  37     acl_cv_prog_gnu_ld_dynamic_list_cpp_new=yes
  38   fi
  39 fi])
  40 if test x"$acl_cv_prog_gnu_ld_dynamic_list_cpp_new" = x"yes"; then
  41    DYNAMIC_LIST_CPP_NEW_LDFLAGS="$SYMBOLIC_LDFLAGS -Wl,--dynamic-list-cpp-new"
  42 else
  43    DYNAMIC_LIST_CPP_NEW_LDFLAGS=''
  44 fi
  45 ])