Edit: /usr/share/aclocal-1.16/ar-lib.m4 (2066B)
## -*- Autoconf -*-
# Copyright (C) 2011-2018 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.
# AM_PROG_AR([ACT-IF-FAIL])
# -------------------------
# Try to determine the archiver interface, and trigger the ar-lib wrapper
# if it is needed. If the detection of archiver interface fails, run
# ACT-IF-FAIL (default is to abort configure with a proper error message).
AC_DEFUN([AM_PROG_AR],
[AC_BEFORE([$0], [LT_INIT])dnl
AC_BEFORE([$0], [AC_PROG_LIBTOOL])dnl
AC_REQUIRE([AM_AUX_DIR_EXPAND])dnl
AC_REQUIRE_AUX_FILE([ar-lib])dnl
AC_CHECK_TOOLS([AR], [ar lib "link -lib"], [false])
: ${AR=ar}
AC_CACHE_CHECK([the archiver ($AR) interface], [am_cv_ar_interface],
[AC_LANG_PUSH([C])
am_cv_ar_interface=ar
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[int some_variable = 0;]])],
[am_ar_try='$AR cru libconftest.a conftest.$ac_objext >&AS_MESSAGE_LOG_FD'
AC_TRY_EVAL([am_ar_try])
if test "$ac_status" -eq 0; then
am_cv_ar_interface=ar
else
am_ar_try='$AR -NOLOGO -OUT:conftest.lib conftest.$ac_objext >&AS_MESSAGE_LOG_FD'
AC_TRY_EVAL([am_ar_try])
if test "$ac_status" -eq 0; then
am_cv_ar_interface=lib
else
am_cv_ar_interface=unknown
fi
fi
rm -f conftest.lib libconftest.a
])
AC_LANG_POP([C])])
case $am_cv_ar_interface in
ar)
;;
lib)
# Microsoft lib, so override with the ar-lib wrapper script.
# FIXME: It is wrong to rewrite AR.
# But if we don't then we get into trouble of one sort or another.
# A longer-term fix would be to have automake use am__AR in this case,
# and then we could set am__AR="$am_aux_dir/ar-lib \$(AR)" or something
# similar.
AR="$am_aux_dir/ar-lib $AR"
;;
unknown)
m4_default([$1],
[AC_MSG_ERROR([could not determine $AR interface])])
;;
esac
AC_SUBST([AR])dnl
])