getgroups: test: =: unary operator expected

[Simon Josefsson]

Jim, the getgroups m4 check causes errors on mingw:

./configure: line 8004: test: =: unary operator expected

The problem is this code:

  AC_REQUIRE([AC_FUNC_GETGROUPS])
  if test $ac_cv_func_getgroups_works = no; then

The AC_FUNC_GETGROUPS function doesn't set ac_cv_func_getgroups_works if
there is no getgroups function at all, which is the case on mingw.

The patch below fixes the configure error, although maybe other
solutions are more preferred.

/Simon

>From 372854e7458969151cd1ec722670f17685479b20 Mon Sep 17 00:00:00 2001
From: Simon Josefsson <address@hidden>
Date: Wed, 22 Oct 2008 14:13:47 +0200
Subject: [PATCH] getgroups: Avoid invoking test with wrong parameters.

---
 ChangeLog       |    4 ++++
 m4/getgroups.m4 |    6 +++---
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 0dca26b..bd0a10a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2008-10-22  Simon Josefsson  <address@hidden>
+
+       * m4/getgroups.m4: Avoid invoking test with wrong parameters.
+
 2008-10-22  Eric Blake  <address@hidden>
 
        glthread/thread: avoid compiler warning
diff --git a/m4/getgroups.m4 b/m4/getgroups.m4
index edc2bde..0364752 100644
--- a/m4/getgroups.m4
+++ b/m4/getgroups.m4
@@ -1,9 +1,9 @@
-#serial 10
+#serial 11
 
 dnl From Jim Meyering.
 dnl A wrapper around AC_FUNC_GETGROUPS.
 
-# Copyright (C) 1996, 1997, 1999, 2000, 2001, 2002, 2003, 2004 Free
+# Copyright (C) 1996, 1997, 1999, 2000, 2001, 2002, 2003, 2004, 2008 Free
 # Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
@@ -13,7 +13,7 @@ dnl A wrapper around AC_FUNC_GETGROUPS.
 AC_DEFUN([gl_FUNC_GETGROUPS],
 [
   AC_REQUIRE([AC_FUNC_GETGROUPS])
-  if test $ac_cv_func_getgroups_works = no; then
+  if test "$ac_cv_func_getgroups_works" != yes; then
     AC_LIBOBJ(getgroups)
     AC_DEFINE(getgroups, rpl_getgroups,
       [Define as rpl_getgroups if getgroups doesn't work right.])
-- 
1.5.6.5