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# ld-version-script.m4 serial 3
dnl Copyright (C) 2008-2012 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 <<EOF
foo
EOF
AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
[accepts_syntax_errors=yes], [accepts_syntax_errors=no])
if test "$accepts_syntax_errors" = no; then
cat > conftest.map <<EOF
VERS_1 {
global: sym;
};
VERS_2 {
global: sym;
} VERS_1;
EOF
AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
[have_ld_version_script=yes], [have_ld_version_script=no])
else
have_ld_version_script=no
fi
rm -f conftest.map
LDFLAGS="$save_LDFLAGS"
AC_MSG_RESULT($have_ld_version_script)
fi
AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")
])
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