testsuite issues on MinGW/MSYS

[Ralf Wildenhues]

I'm seeing a couple of weird issues on MinGW/MSYS.
First of all, several spurious failures of this kind:

./defs: line 33: /bin/sed: Resource temporarily unavailable

The line in question is:
  me=`echo "$argv0" | sed -e 's,.*[\\/],,;s/\.test$//'`

This is on a loaded system, but I don't remember having seen this before
at all.  So I wonder what actually causes this behavior.  There is also
a stack dump from some sed invocation, so maybe my installation is
corrupted.

Anyway, the above causes all kinds of ugly misbehavior, starting with
all tests being run in the same directory '.dir', and several tests
failing because 'make dist' tries to 'mkdir -1', as $(PACKAGE) is
empty.

I'm merging the following as a stop-gap measure, to at least make the
behavior obvious.  And I'm going to review Stefano's pending tests-init
patches next, as they address a number of related issues around this
area.

Cheers,
Ralf

    tests: avoid spurious failures due to fork failure in test setup
    
    * tests/defs: Ensure $me is always nonempty, to avoid spurious
    failures on MinGW/MSYS in case the preceding sed command could
    not be spawned.

diff --git a/tests/defs b/tests/defs
index 64ed985..0f84d0a 100644
--- a/tests/defs
+++ b/tests/defs
@@ -1,7 +1,8 @@
 # -*- shell-script -*-
 #
 # Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
-# 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+# 2005, 2006, 2007, 2008, 2009, 2010, 2011 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
@@ -31,6 +32,7 @@ test -f ./defs-static || {
 
 # The name of the current test (without the `.test' suffix.)
 me=`echo "$argv0" | sed -e 's,.*[\\/],,;s/\.test$//'`
+test -n "$me" || exit 99
 
 
 ## ---------------------------------------- ##