dnl Check whether the linker supports --version-script.
dnl
dnl Probes whether the linker supports --version-script with a simple version
dnl script that only defines a single version.  Sets the Automake conditional
dnl HAVE_LD_VERSION_SCRIPT based on whether it is supported.
dnl
dnl The canonical version of this file is maintained in the rra-c-util
dnl package, available at <https://www.eyrie.org/~eagle/software/rra-c-util/>.
dnl
dnl Written by Russ Allbery <eagle@eyrie.org>
dnl Based on the gnulib ld-version-script macro from Simon Josefsson
dnl Copyright 2010
dnl     The Board of Trustees of the Leland Stanford Junior University
dnl Copyright 2008-2010 Free Software Foundation, Inc.
dnl
dnl This file is free software; the authors give unlimited permission to copy
dnl and/or distribute it, with or without modifications, as long as this
dnl notice is preserved.
dnl
dnl SPDX-License-Identifier: FSFULLR

AC_DEFUN([RRA_LD_VERSION_SCRIPT],
[AC_CACHE_CHECK([if -Wl,--version-script works], [rra_cv_ld_version_script],
    [save_LDFLAGS="$LDFLAGS"
     LDFLAGS="$LDFLAGS -Wl,--version-script=conftest.map"
     cat > conftest.map <<EOF
VERSION_1 {
    global:
        sym;

    local:
        *;
};
EOF
     AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
        [rra_cv_ld_version_script=yes], [rra_cv_ld_version_script=no])
     rm -f conftest.map
     LDFLAGS="$save_LDFLAGS"])
 AM_CONDITIONAL([HAVE_LD_VERSION_SCRIPT],
    [test x"$rra_cv_ld_version_script" = xyes])])