# ld-version-script.m4 serial 4

dnl Copyright (C) 2008-2016 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],

    [AC_CACHE_CHECK([if LD -Wl,--version-script works],

       [gl_cv_sys_ld_version_script],

       [gl_cv_sys_ld_version_script=no

        save_LDFLAGS=$LDFLAGS

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

        echo foo >conftest.map

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

          [],

          [cat > conftest.map <

VERS_1 {

        global: sym;

};

VERS_2 {

        global: sym;

} VERS_1;

EOF

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

             [gl_cv_sys_ld_version_script=yes])])

        rm -f conftest.map

        LDFLAGS=$save_LDFLAGS])

     have_ld_version_script=$gl_cv_sys_ld_version_script])

  AM_CONDITIONAL([HAVE_LD_VERSION_SCRIPT],

    [test "$have_ld_version_script" = yes])

])