2 # Copyright (C) 2011 Free Software Foundation, Inc.
4 # This file is free software; the Free Software Foundation
5 # gives unlimited permission to copy and/or distribute it,
6 # with or without modifications, as long as this notice is preserved.
10 # AM_PROG_AR([ACT-IF-FAIL])
11 # -------------------------
12 # Try to determine the archiver interface, and trigger the ar-lib wrapper
13 # if it is needed. If the detection of archiver interface fails, run
14 # ACT-IF-FAIL (default is to abort configure with a proper error message).
15 AC_DEFUN([AM_PROG_AR],
16 [AC_BEFORE([$0], [LT_INIT])dnl
17 AC_BEFORE([$0], [AC_PROG_LIBTOOL])dnl
18 AC_REQUIRE([AM_AUX_DIR_EXPAND])dnl
19 AC_REQUIRE_AUX_FILE([ar-lib])dnl
20 AC_CHECK_TOOLS([AR], [ar lib "link -lib"], [false])
23 AC_CACHE_CHECK([the archiver ($AR) interface], [am_cv_ar_interface],
24 [am_cv_ar_interface=ar
25 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[int some_variable = 0;]])],
26 [am_ar_try='$AR cru libconftest.a conftest.$ac_objext >&AS_MESSAGE_LOG_FD'
27 AC_TRY_EVAL([am_ar_try])
28 if test "$ac_status" -eq 0; then
31 am_ar_try='$AR -NOLOGO -OUT:conftest.lib conftest.$ac_objext >&AS_MESSAGE_LOG_FD'
32 AC_TRY_EVAL([am_ar_try])
33 if test "$ac_status" -eq 0; then
34 am_cv_ar_interface=lib
36 am_cv_ar_interface=unknown
39 rm -f conftest.lib libconftest.a
43 case $am_cv_ar_interface in
47 # Microsoft lib, so override with the ar-lib wrapper script.
48 # FIXME: It is wrong to rewrite AR.
49 # But if we don't then we get into trouble of one sort or another.
50 # A longer-term fix would be to have automake use am__AR in this case,
51 # and then we could set am__AR="$am_aux_dir/ar-lib \$(AR)" or something
53 AR="$am_aux_dir/ar-lib $AR"
57 [AC_MSG_ERROR([could not determine $AR interface])])