1 # ld-version-script.m4 serial 3
2 dnl Copyright (C) 2008-2012 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 dnl From Simon Josefsson
9 # FIXME: The test below returns a false positive for mingw
10 # cross-compiles, 'local:' statements does not reduce number of
11 # exported symbols in a DLL. Use --disable-ld-version-script to work
14 # gl_LD_VERSION_SCRIPT
15 # --------------------
16 # Check if LD supports linker scripts, and define automake conditional
17 # HAVE_LD_VERSION_SCRIPT if so.
18 AC_DEFUN([gl_LD_VERSION_SCRIPT],
20 AC_ARG_ENABLE([ld-version-script],
21 AS_HELP_STRING([--enable-ld-version-script],
22 [enable linker version script (default is enabled when possible)]),
23 [have_ld_version_script=$enableval], [])
24 if test -z "$have_ld_version_script"; then
25 AC_MSG_CHECKING([if LD -Wl,--version-script works])
26 save_LDFLAGS="$LDFLAGS"
27 LDFLAGS="$LDFLAGS -Wl,--version-script=conftest.map"
28 cat > conftest.map <<EOF
31 AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
32 [accepts_syntax_errors=yes], [accepts_syntax_errors=no])
33 if test "$accepts_syntax_errors" = no; then
34 cat > conftest.map <<EOF
43 AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
44 [have_ld_version_script=yes], [have_ld_version_script=no])
46 have_ld_version_script=no
49 LDFLAGS="$save_LDFLAGS"
50 AC_MSG_RESULT($have_ld_version_script)
52 AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")