tests: avoid spurious failure of 'transform2.test' on Cygwin

On newer Cygwin versions (at least 1.7.x), the 'transform2.test'
test has been failing spuriously; the gist is the following:
some *purposefully* rigged install rules there try something
like:

  install bla.exe .../inst/bin/foo.exe
  install script.sh .../inst/bin/foo

and the second install command fails (trying to overwrite the
'.../inst/bin/foo.exe' file, likely due to overly aggressive
appending of '.exe' suffix when copying/renaming Windows
executables).  Since this is a Cygwin issue rather than an
Automake one (and since the use case we are testing is a really
corner-case anyway, making it unworthy to attempt to work
around it in automake proper), we simply hack the test case
to avoid the failure.

Analysis by Peter Rosin and Ralf Wildenhues.

References:
<http://lists.gnu.org/archive/html/automake-patches/2010-08/msg00153.html>
<http://thread.gmane.org/gmane.os.cygwin/119380>

* tests/transform2.test: Skip the affected part of the test
if the described Cygwin behaviour is detected.

diff --git a/tests/transform2.test b/tests/transform2.test
index 0f9d5ec081e7ab020a140825df308a68e3ebec92..07943bc9a4ed308146e15fc6c20304d3250f0162 100755 (executable)
--- a/tests/transform2.test
+++ b/tests/transform2.test
@@ -1,5 +1,6 @@
 #! /bin/sh
-# Copyright (C) 2002, 2003, 2004, 2007, 2008  Free Software Foundation, Inc.
+# Copyright (C) 2002, 2003, 2004, 2007, 2008, 2012 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
@@ -74,9 +75,23 @@ $MAKE uninstall
 test `find inst -type f -print | wc -l` = 0
 
 # Also squash all file types in question.
+
+# On newer Cygwin versions, that won't work, likely due to overly
+# aggressive appending of '.exe' suffix when copying/renaming Windows
+# executables).  So let's skip this part of the test if we detect the
+# faulty heuristic is present.  See also:
+# <http://lists.gnu.org/archive/html/automake-patches/2010-08/msg00153.html>
+# <http://thread.gmane.org/gmane.os.cygwin/119380>
+echo Foo > foo
+echo Bar > bar.exe
+chmod a+x foo bar.exe
+cp foo bar && cmp foo bar \
+  || skip_ "your Cygwin is too aggressive in tweaking '.exe' suffixes"
+
 ./configure --program-transform-name='s/.*/foo/' --prefix "`pwd`/inst" --mandir "`pwd`/inst/man"
 $MAKE
 $MAKE test-install-foo
 $MAKE uninstall
 test `find inst -type f -print | wc -l` = 0
+
 :