[PATCH] Add new 'AM_PROG_AR' macro, triggering the 'ar-lib' script.

[Peter Rosin]

Hi!

This is a second attempt to implement AM_PROG_AR. The previous attempt
was bundled with the addition of the 'ar-lib' script but was left
behind. I have now fleshed it out with tests and portability warnings
etc.

I think I have everything in the thread covered:
http://lists.gnu.org/archive/html/automake-patches/2010-08/msg00116.html
This is going with case (1) in that message.

However, I have only updated tests/ar.test to cope with the new
reality. So, a lot of tests (100?) are likely to fall over due to the
new portability warnings. The reason is that I don't know on what
branch I should base such an intrusive patch. I fear that such a
patch, when merged elsewhere, will be incomplete or otherwise
difficult to merge due to other changes. I'm also not sure if this
is the desired route. Please advise.

This patch is on top of the msvc branch.

AC_PROG_RANLIB is rendered obsolete by LT_INIT. Is it also rendered
obsolete by AC_PROG_LIBTOOL? Should I not care about libtool 1.5?

Cheers,
Peter


>From e4810ab05c41461c3b6c5638a41d8d415ebcc40f Mon Sep 17 00:00:00 2001
From: Peter Rosin <address@hidden>
Date: Tue, 14 Sep 2010 14:58:17 +0200
Subject: [PATCH] Add new 'AM_PROG_AR' macro, triggering the 'ar-lib' script.

* m4/ar-lib.m4: New macro AM_PROG_AR, which locates an
archiver and triggers the auxiliary 'ar-lib' script if needed.
* m4/Makefile.am: Add above.
* automake.in (seen_ar): New variable.
(scan_autoconf_traces): Set it.
(handle_libraries): Don't set default values for AR and ARFLAGS
if AM_PROG_AR has been seen.
(handle_libraries, handle_ltlibraries): Require AM_PROG_AR for
portability.
* doc/automake.texi (Public Macros): Mention the new
'AM_PROG_AR' macro.
(Subpackages): Add AM_PROG_AR to the example.
(A Library): Adjust recommendations for AR given the new
AM_PROG_AR macro.
* tests/ar.test: Adjust to avoid portability warnings.
* tests/ar-lib2.test: New test.  Test if AM_PROG_AR triggers
install of ar-lib.
* tests/ar-lib3.test: New test.  Test if lib_LIBRARIES requires
AM_PROG_AR.
* tests/ar-lib4.test: New test.  Test if lib_LTLIBRARIES requires
AM_PROG_AR.
* tests/ar-lib5.test: New test.  Test if AM_PROG_AR triggers
use of ar-lib when the archiver is Microsoft lib.
* tests/ar-lib6.test: New test.  Test ordering of AM_PROG_AR and
LT_INIT.
* tests/defs.in: New required entry 'lib'.
* tests/Makefile.am: Add new tests.
* NEWS: Update.
---
 ChangeLog          |   33 +++++++++++++++++++++++++++
 NEWS               |    3 ++
 automake.in        |   29 ++++++++++++++++++++++-
 doc/automake.texi  |   18 ++++++++++----
 m4/Makefile.am     |    1 +
 m4/Makefile.in     |    1 +
 m4/ar-lib.m4       |   55 +++++++++++++++++++++++++++++++++++++++++++++
 tests/Makefile.am  |    5 ++++
 tests/Makefile.in  |    5 ++++
 tests/ar-lib2.test |   40 +++++++++++++++++++++++++++++++++
 tests/ar-lib3.test |   51 ++++++++++++++++++++++++++++++++++++++++++
 tests/ar-lib4.test |   63 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/ar-lib5.test |   56 ++++++++++++++++++++++++++++++++++++++++++++++
 tests/ar-lib6.test |   38 +++++++++++++++++++++++++++++++
 tests/ar.test      |    3 +-
 tests/defs.in      |   10 ++++++++
 16 files changed, 403 insertions(+), 8 deletions(-)
 create mode 100644 m4/ar-lib.m4
 create mode 100755 tests/ar-lib2.test
 create mode 100755 tests/ar-lib3.test
 create mode 100755 tests/ar-lib4.test
 create mode 100755 tests/ar-lib5.test
 create mode 100755 tests/ar-lib6.test

diff --git a/ChangeLog b/ChangeLog
index 02f2fcd..b911686 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,36 @@
+2010-09-14  Peter Rosin  <address@hidden>
+           Ralf Wildenhues  <address@hidden>
+
+       Add new 'AM_PROG_AR' macro, triggering the 'ar-lib' script.
+       * m4/ar-lib.m4: New macro AM_PROG_AR, which locates an
+       archiver and triggers the auxiliary 'ar-lib' script if needed.
+       * m4/Makefile.am: Add above.
+       * automake.in (seen_ar): New variable.
+       (scan_autoconf_traces): Set it.
+       (handle_libraries): Don't set default values for AR and ARFLAGS
+       if AM_PROG_AR has been seen.
+       (handle_libraries, handle_ltlibraries): Require AM_PROG_AR for
+       portability.
+       * doc/automake.texi (Public Macros): Mention the new
+       'AM_PROG_AR' macro.
+       (Subpackages): Add AM_PROG_AR to the example.
+       (A Library): Adjust recommendations for AR given the new
+       AM_PROG_AR macro.
+       * tests/ar.test: Adjust to avoid portability warnings.
+       * tests/ar-lib2.test: New test.  Test if AM_PROG_AR triggers
+       install of ar-lib.
+       * tests/ar-lib3.test: New test.  Test if lib_LIBRARIES requires
+       AM_PROG_AR.
+       * tests/ar-lib4.test: New test.  Test if lib_LTLIBRARIES requires
+       AM_PROG_AR.
+       * tests/ar-lib5.test: New test.  Test if AM_PROG_AR triggers
+       use of ar-lib when the archiver is Microsoft lib.
+       * tests/ar-lib6.test: New test.  Test ordering of AM_PROG_AR and
+       LT_INIT.
+       * tests/defs.in: New required entry 'lib'.
+       * tests/Makefile.am: Add new tests.
+       * NEWS: Update.
+
 2010-09-02  Peter Rosin  <address@hidden>
 
        Make ar-lib support backslashed files in archives.
diff --git a/NEWS b/NEWS
index 6971bd7..41a6cc8 100644
--- a/NEWS
+++ b/NEWS
@@ -8,6 +8,9 @@ New in 1.11.0a:
   - The `compile' script now converts some options for MSVC for a better
     user experience.  Similarly, the new `ar-lib' script wraps Microsoft lib.
 
+  - New macro AM_PROG_AR that looks for an archiver and wraps it in the new
+    'ar-lib' auxiliary script if the found archiver is Microsoft lib.
+
 Bugs fixed in 1.11.0a:
 
 * Bugs introduced by 1.11:
diff --git a/automake.in b/automake.in
index 8fd6869..f672286 100755
--- a/automake.in
+++ b/automake.in
@@ -396,6 +396,9 @@ my $package_version_location;
 # TRUE if we've seen AM_ENABLE_MULTILIB.
 my $seen_multilib = 0;
 
+# TRUE if we've seen AM_PROG_AR
+my $seen_ar = 0;
+
 # TRUE if we've seen AM_PROG_CC_C_O
 my $seen_cc_c_o = 0;
 
@@ -2718,8 +2721,11 @@ sub handle_libraries
       $var->requires_variables ('library used', 'RANLIB');
     }
 
-  &define_variable ('AR', 'ar', INTERNAL);
-  &define_variable ('ARFLAGS', 'cru', INTERNAL);
+  if (! $seen_ar)
+    {
+      &define_variable ('AR', 'ar', INTERNAL);
+      &define_variable ('ARFLAGS', 'cru', INTERNAL);
+    }
   &define_verbose_tagvar ('AR');
 
   foreach my $pair (@liblist)
@@ -2800,6 +2806,13 @@ sub handle_libraries
              &check_libobjs_sources ($xlib, $xlib . '_LIBADD');
            }
        }
+
+      if (! $seen_ar)
+       {
+         msg ('portability', $where,
+              "`$onelib': linking libraries requires "
+              . "`AM_PROG_AR' in `$configure_ac'")
+       }
     }
 }
 
@@ -3037,6 +3050,13 @@ sub handle_ltlibraries
              &check_libobjs_sources ($xlib, $xlib . '_LIBADD');
            }
        }
+
+      if (! $seen_ar)
+       {
+         msg ('portability', $where,
+              "`$onelib': linking libtool libraries requires "
+              . "`AM_PROG_AR' in `$configure_ac'")
+       }
     }
 }
 
@@ -5242,6 +5262,7 @@ sub scan_autoconf_traces ($)
                AM_GNU_GETTEXT_INTL_SUBDIR => 0,
                AM_INIT_AUTOMAKE => 0,
                AM_MAINTAINER_MODE => 0,
+               AM_PROG_AR => 0,
                AM_PROG_CC_C_O => 0,
                AM_SILENT_RULES => 0,
                _AM_SUBST_NOTMAKE => 1,
@@ -5433,6 +5454,10 @@ sub scan_autoconf_traces ($)
        {
          $seen_maint_mode = $where;
        }
+      elsif ($macro eq 'AM_PROG_AR')
+       {
+         $seen_ar = $where;
+       }
       elsif ($macro eq 'AM_PROG_CC_C_O')
        {
          $seen_cc_c_o = $where;
diff --git a/doc/automake.texi b/doc/automake.texi
index 66c5a7e..97d7a60 100644
--- a/doc/automake.texi
+++ b/doc/automake.texi
@@ -3861,6 +3861,12 @@ environment, or use the @option{--with-lispdir} option to
 @command{configure} to explicitly set the correct path (if you're sure
 you have an @command{emacs} that supports Emacs Lisp).
 
address@hidden AM_PROG_AR
address@hidden AM_PROG_AR
address@hidden AR
+You must use this macro when you use the archiver in your project, if
+you want support for weird archivers such as Microsoft lib.
+
 @item AM_PROG_AS
 @acindex AM_PROG_AS
 @vindex CCAS
@@ -4485,6 +4491,7 @@ AC_INIT([hand], [1.2])
 AC_CONFIG_AUX_DIR([.])
 AM_INIT_AUTOMAKE
 AC_PROG_CC
+AM_PROG_AR
 AC_PROG_RANLIB
 AC_CONFIG_FILES([Makefile])
 AC_OUTPUT
@@ -4923,11 +4930,12 @@ by invoking @samp{$(AR) $(ARFLAGS)} followed by the 
name of the
 library and the list of objects, and finally by calling
 @samp{$(RANLIB)} on that library.  You should call
 @code{AC_PROG_RANLIB} from your @file{configure.ac} to define
address@hidden (Automake will complain otherwise).  @code{AR} and
address@hidden default to @code{ar} and @code{cru} respectively; you
-can override these two variables my setting them in your
address@hidden, by @code{AC_SUBST}ing them from your
address@hidden, or by defining a per-library @code{maude_AR}
address@hidden (Automake will complain otherwise).  You should also
+call @code{AM_PROG_AR} to define @code{AR}, in order to support weird
+archivers.  @code{ARFLAGS} will default to @code{cru}; you can override
+this variable by setting it in your @file{Makefile.am} or by
address@hidden it from your @file{configure.ac}.  You can override
+the @code{AR} variable by defining a per-library @code{maude_AR}
 variable (@pxref{Program and Library Variables}).
 
 @cindex Empty libraries
diff --git a/m4/Makefile.am b/m4/Makefile.am
index 0cf074b..c801894 100644
--- a/m4/Makefile.am
+++ b/m4/Makefile.am
@@ -22,6 +22,7 @@ m4datadir = $(datadir)/aclocal-$(APIVERSION)
 
 dist_m4data_DATA = \
 $(top_srcdir)/m4/amversion.m4 \
+ar-lib.m4 \
 as.m4 \
 auxdir.m4 \
 ccstdc.m4 \
diff --git a/m4/Makefile.in b/m4/Makefile.in
index 270ee91..4cd3e28 100644
--- a/m4/Makefile.in
+++ b/m4/Makefile.in
@@ -185,6 +185,7 @@ top_srcdir = @top_srcdir@
 m4datadir = $(datadir)/aclocal-$(APIVERSION)
 dist_m4data_DATA = \
 $(top_srcdir)/m4/amversion.m4 \
+ar-lib.m4 \
 as.m4 \
 auxdir.m4 \
 ccstdc.m4 \
diff --git a/m4/ar-lib.m4 b/m4/ar-lib.m4
new file mode 100644
index 0000000..b5a349e
--- /dev/null
+++ b/m4/ar-lib.m4
@@ -0,0 +1,55 @@
+##                                                          -*- Autoconf -*-
+# Copyright (C) 2010
+# 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.
+
+# serial 1
+
+# AM_PROG_AR
+# --------------
+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],
+  [am_cv_ar_interface=ar
+   AC_COMPILE_IFELSE([[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.$ac_objext'
+        AC_TRY_EVAL([am_ar_try])
+        if test "$ac_status" -eq 0; then
+          am_cv_ar_interface=lib
+        else
+          m4_default([$1],
+            [AC_MSG_ERROR([could not determine $AR interface])])
+        fi
+      fi
+      rm -f conftest.lib libconftest.a
+     ])
+   ])
+
+case $am_cv_ar_interface in
+ar)
+  ;;
+lib)
+  # Microsoft lib, so override with the ar-lib wrapper script.
+  # FIXME: It is wrong to rewrite AR.
+  # But if we don't then we get into trouble of one sort or another.
+  # A longer-term fix would be to have automake use am__AR in this case,
+  # and then we could set am__AR="\$(top_srcdir)/ar-lib \$(AR)"
+  AR="$am_aux_dir/ar-lib $AR"
+  ;;
+esac
+AC_SUBST([AR])dnl
+])
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 01acd76..7297fcb 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -89,6 +89,11 @@ ansi8.test \
 ansi9.test \
 ansi10.test \
 ar-lib.test \
+ar-lib2.test \
+ar-lib3.test \
+ar-lib4.test \
+ar-lib5.test \
+ar-lib6.test \
 ar.test \
 ar2.test \
 asm.test \
diff --git a/tests/Makefile.in b/tests/Makefile.in
index ff547a0..9826c65 100644
--- a/tests/Makefile.in
+++ b/tests/Makefile.in
@@ -327,6 +327,11 @@ ansi8.test \
 ansi9.test \
 ansi10.test \
 ar-lib.test \
+ar-lib2.test \
+ar-lib3.test \
+ar-lib4.test \
+ar-lib5.test \
+ar-lib6.test \
 ar.test \
 ar2.test \
 asm.test \
diff --git a/tests/ar-lib2.test b/tests/ar-lib2.test
new file mode 100755
index 0000000..7697876
--- /dev/null
+++ b/tests/ar-lib2.test
@@ -0,0 +1,40 @@
+#! /bin/sh
+# Copyright (C) 2010 Free Software Foundation, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Test if AM_PROG_AR installs ar-lib.
+
+. ./defs || Exit 1
+
+set -e
+
+cat >> configure.in << 'END'
+AC_PROG_CC
+AM_PROG_AR
+END
+
+cat > Makefile.am << 'END'
+bin_PROGRAMS = wish
+wish_SOURCES = a.c
+END
+
+$ACLOCAL
+$AUTOMAKE --add-missing 2>stderr || { cat stderr >&2; Exit 1; }
+cat stderr >&2
+# Make sure ar-lib is installed, and that Automake says so.
+grep 'install.*ar-lib' stderr
+test -f ar-lib
+
+:
diff --git a/tests/ar-lib3.test b/tests/ar-lib3.test
new file mode 100755
index 0000000..c5cbb2f
--- /dev/null
+++ b/tests/ar-lib3.test
@@ -0,0 +1,51 @@
+#! /bin/sh
+# Copyright (C) 2010 Free Software Foundation, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Test if lib_LIBRARIES requests AM_PROG_AR.
+
+. ./defs || Exit 1
+
+set -e
+
+cat >> configure.in << 'END'
+AC_PROG_CC
+AC_PROG_RANLIB
+END
+
+cat > Makefile.am << 'END'
+lib_LIBRARIES = libfoo.a
+libfoo_a_SOURCES = foo.c
+END
+
+$ACLOCAL
+$AUTOCONF
+AUTOMAKE_fails
+
+grep 'requires.*AM_PROG_AR' stderr
+
+cat >> configure.in << 'END'
+AM_PROG_AR
+END
+
+$ACLOCAL
+$AUTOCONF
+AUTOMAKE_fails
+
+grep 'ar-lib.*not found' stderr
+
+$AUTOMAKE --add-missing
+
+:
diff --git a/tests/ar-lib4.test b/tests/ar-lib4.test
new file mode 100755
index 0000000..c389189
--- /dev/null
+++ b/tests/ar-lib4.test
@@ -0,0 +1,63 @@
+#! /bin/sh
+# Copyright (C) 2010 Free Software Foundation, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Test if lib_LTLIBRARIES requests AM_PROG_AR.
+
+required=libtoolize
+. ./defs || Exit 1
+
+set -e
+
+cp configure.in X
+
+cat >> configure.in << 'END'
+AC_PROG_CC
+AC_PROG_RANLIB
+AC_PROG_LIBTOOL
+AC_OUTPUT
+END
+
+cat > Makefile.am << 'END'
+lib_LTLIBRARIES = libfoo.la
+libfoo_la_SOURCES = foo.c
+END
+
+libtoolize
+$ACLOCAL
+$AUTOCONF
+AUTOMAKE_fails
+
+grep 'requires.*AM_PROG_AR' stderr
+
+cp X configure.in
+
+cat >> configure.in << 'END'
+AC_PROG_CC
+AM_PROG_AR
+AC_PROG_RANLIB
+AC_PROG_LIBTOOL
+AC_OUTPUT
+END
+
+$ACLOCAL
+$AUTOCONF
+AUTOMAKE_fails
+
+grep 'ar-lib.*not found' stderr
+
+$AUTOMAKE --add-missing
+
+:
diff --git a/tests/ar-lib5.test b/tests/ar-lib5.test
new file mode 100755
index 0000000..f6eb5b4
--- /dev/null
+++ b/tests/ar-lib5.test
@@ -0,0 +1,56 @@
+#! /bin/sh
+# Copyright (C) 2010 Free Software Foundation, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Test if AM_PROG_AR triggers the use of the ar-lib script.
+
+requires=lib
+. ./defs || Exit 1
+
+set -e
+
+cat >> configure.in << 'END'
+AC_PROG_CC
+AM_PROG_AR
+AC_PROG_RANLIB
+AC_OUTPUT
+END
+
+cat > Makefile.am << 'END'
+lib_LIBRARIES = libwish.a
+libwish_a_SOURCES = wish.c
+END
+
+cat > wish.c << 'END'
+int wish(void) { return 0; }
+END
+
+$ACLOCAL
+$AUTOCONF
+$AUTOMAKE --add-missing --copy
+./configure AR=lib RANLIB=:
+
+cat > ar-lib << 'END'
+# /bin/sh
+echo "It works"
+END
+chmod +x ar-lib
+
+$MAKE > stdout
+cat stdout
+
+grep 'It works' stdout
+
+:
diff --git a/tests/ar-lib6.test b/tests/ar-lib6.test
new file mode 100755
index 0000000..45693dd
--- /dev/null
+++ b/tests/ar-lib6.test
@@ -0,0 +1,38 @@
+#! /bin/sh
+# Copyright (C) 2010 Free Software Foundation, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Test AM_PROG_AR ordering requirements
+
+required=libtoolize
+. ./defs || Exit 1
+
+set -e
+
+cat >> configure.in << 'END'
+AC_PROG_CC
+AC_PROG_RANLIB
+m4_ifdef([LT_INIT], [LT_INIT], [AC_PROG_LIBTOOL])
+AM_PROG_AR
+END
+
+libtoolize
+$ACLOCAL
+$AUTOCONF 2>stderr
+cat stderr
+
+$EGREP '(AC_PROG_LIBTOOL|LT_INIT).*before.*AM_PROG_AR' stderr
+
+:
diff --git a/tests/ar.test b/tests/ar.test
index d68fc54..00ea69e 100755
--- a/tests/ar.test
+++ b/tests/ar.test
@@ -21,6 +21,7 @@
 set -e
 
 cat >> configure.in << 'END'
+AM_PROG_AR
 AC_SUBST([AR], ['echo it works'])
 AC_SUBST([ARFLAGS], ['>'])
 AC_SUBST([RANLIB], ['echo really works >>'])
@@ -34,7 +35,7 @@ END
 
 $ACLOCAL
 $AUTOCONF
-$AUTOMAKE
+$AUTOMAKE --add-missing
 ./configure
 $MAKE
 grep 'it works' libfoo.a
diff --git a/tests/defs.in b/tests/defs.in
index af4a3cd..31003ff 100644
--- a/tests/defs.in
+++ b/tests/defs.in
@@ -156,6 +156,16 @@ do
       echo "$me: running $CC -V -help"
       ( $CC -V -help ) || exit 77
       ;;
+    lib)
+      AR=lib
+      export AR
+      # There is no way to get any identifying output with
+      # a zero exit status. So, remap exit status 76 to 0.
+      echo "$me: running $AR -?"
+      exit_status=0
+      ( $AR -? ) || exit_status=$?
+      test $exit_status = 76 && exit 77
+      ;;
     makedepend)
       echo "$me: running makedepend -f-"
       ( makedepend -f- ) || exit 77
-- 
1.7.1