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# ld-version-script.m4 serial 4
dnl Copyright (C) 2008-2017 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="$LDFLAGS -Wl,--version-script=conftest.map"
echo foo >conftest.map
AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
[],
[cat > conftest.map <<EOF
VERS_1 {
global: sym;
};
VERS_2 {
global: sym;
} VERS_1;
EOF
AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
[gl_cv_sys_ld_version_script=yes])])
rm -f conftest.map
LDFLAGS=$save_LDFLAGS])
have_ld_version_script=$gl_cv_sys_ld_version_script])
AM_CONDITIONAL([HAVE_LD_VERSION_SCRIPT],
[test "$have_ld_version_script" = yes])
])
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