2 # Copyright (C) 2011-2017 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.
8 # AM_PROG_AR([ACT-IF-FAIL])
9 # -------------------------
10 # Try to determine the archiver interface, and trigger the ar-lib wrapper
11 # if it is needed. If the detection of archiver interface fails, run
12 # ACT-IF-FAIL (default is to abort configure with a proper error message).
13 AC_DEFUN([AM_PROG_AR],
14 [AC_BEFORE([$0], [LT_INIT])dnl
15 AC_BEFORE([$0], [AC_PROG_LIBTOOL])dnl
16 AC_REQUIRE([AM_AUX_DIR_EXPAND])dnl
17 AC_REQUIRE_AUX_FILE([ar-lib])dnl
18 AC_CHECK_TOOLS([AR], [ar lib "link -lib"], [false])
21 AC_CACHE_CHECK([the archiver ($AR) interface], [am_cv_ar_interface],
24 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[int some_variable = 0;]])],
25 [am_ar_try='$AR cru libconftest.a conftest.$ac_objext >&AS_MESSAGE_LOG_FD'
26 AC_TRY_EVAL([am_ar_try])
27 if test "$ac_status" -eq 0; then
30 am_ar_try='$AR -NOLOGO -OUT:conftest.lib conftest.$ac_objext >&AS_MESSAGE_LOG_FD'
31 AC_TRY_EVAL([am_ar_try])
32 if test "$ac_status" -eq 0; then
33 am_cv_ar_interface=lib
35 am_cv_ar_interface=unknown
38 rm -f conftest.lib libconftest.a
42 case $am_cv_ar_interface in
46 # Microsoft lib, so override with the ar-lib wrapper script.
47 # FIXME: It is wrong to rewrite AR.
48 # But if we don't then we get into trouble of one sort or another.
49 # A longer-term fix would be to have automake use am__AR in this case,
50 # and then we could set am__AR="$am_aux_dir/ar-lib \$(AR)" or something
52 AR="$am_aux_dir/ar-lib $AR"
56 [AC_MSG_ERROR([could not determine $AR interface])])