# ld-version-script.m4 serial 3

dnl Copyright (C) 2008-2014 Free Software Foundation, Inc.

dnl This file is free software; the Free Software Foundation

dnl gives unlimited permission to copy and/or distribute it,

dnl with or without modifications, as long as this notice is preserved.

dnl From Simon Josefsson

# FIXME: The test below returns a false positive for mingw

# cross-compiles, 'local:' statements does not reduce number of

# exported symbols in a DLL.  Use --disable-ld-version-script to work

# around the problem.

# gl_LD_VERSION_SCRIPT

# --------------------

# Check if LD supports linker scripts, and define automake conditional

# HAVE_LD_VERSION_SCRIPT if so.

AC_DEFUN([gl_LD_VERSION_SCRIPT],

[

  AC_ARG_ENABLE([ld-version-script],

    AS_HELP_STRING([--enable-ld-version-script],

      [enable linker version script (default is enabled when possible)]),

      [have_ld_version_script=$enableval], [])

  if test -z "$have_ld_version_script"; then

    AC_MSG_CHECKING([if LD -Wl,--version-script works])

    save_LDFLAGS="$LDFLAGS"

    LDFLAGS="$LDFLAGS -Wl,--version-script=conftest.map"

    cat > conftest.map <

foo

EOF

    AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],

                   [accepts_syntax_errors=yes], [accepts_syntax_errors=no])

    if test "$accepts_syntax_errors" = no; then

      cat > conftest.map <

VERS_1 {

        global: sym;

};

VERS_2 {

        global: sym;

} VERS_1;

EOF

      AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],

                     [have_ld_version_script=yes], [have_ld_version_script=no])

    else

      have_ld_version_script=no

    fi

    rm -f conftest.map

    LDFLAGS="$save_LDFLAGS"

    AC_MSG_RESULT($have_ld_version_script)

  fi

  AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")

])