1 # ld-version-script.m4 serial 4
2 dnl Copyright (C) 2008-2020 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=$enableval],
24 [AC_CACHE_CHECK([if LD -Wl,--version-script works],
25 [gl_cv_sys_ld_version_script],
26 [gl_cv_sys_ld_version_script=no
28 LDFLAGS="$LDFLAGS -Wl,--version-script=conftest.map"
29 echo foo >conftest.map
30 AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
32 [cat > conftest.map <<EOF
41 AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
42 [gl_cv_sys_ld_version_script=yes])])
44 LDFLAGS=$save_LDFLAGS])
45 have_ld_version_script=$gl_cv_sys_ld_version_script])
46 AM_CONDITIONAL([HAVE_LD_VERSION_SCRIPT],
47 [test "$have_ld_version_script" = yes])