cygwin testsuite failure

[Eric Blake]

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With cygwin 1.5.25 and all pre-built cygwin packages installed, I get the
following failure on bison 2.3b+ and m4 1.4.11: (full log attached,
relevant portion clipped here)

## ---------------------- ##
## Detailed failed tests. ##
## ---------------------- ##

#                             -*- compilation -*-
49. output.at:188: testing ...
./output.at:188: bison -o "address@hidden&*()-=_+{}[]|\\:;<>, .'.c"
- --defines="\`~!@
#\$%^&*()-=_+{}[]|\\:;<>, .'.h" glr.y
Not enabling shell tracing (command contains a `...` command substitution)
- --- /dev/null   2006-11-30 17:00:00.000000000 -0700
+++ /home/eblake/bison/tests/testsuite.dir/at-groups/49/stderr  2008-07-11
14:54
:18.921875000 -0600
@@ -0,0 +1 @@
+/home/eblake/bison/src/bison: cannot open file
address@hidden&*()-=_+{}[]|\:;<>, .'.
c': No such file or directory
./output.at:188: exit code was 1, expected 0
49. output.at:188: 49. Output file name: address@hidden&*()-=_+{}[]|\:;<>, .'
(output.
at:188): FAILED (output.at:188)

On cygwin, \ is an (alternate) directory separator, and since
"address@hidden&*()-=_{}[]|" isn't a directory, that explains the ENOENT failure
for the file "\:;<>, .".  For that matter, if I don't use a cygwin managed
mount, then there are additional restrictions enforced by Windows (at
least {}<> are also invalid, : is iffy, and trailing . is silently
stripped).  Since this test is relying on a non-portable file name, it is
probably easiest to just make it skip if the file doesn't work for the
current file system.  Another option would be borrowing from autoconf's
testsuite, which determines which characters are invalid for the current
file system, then comes up with a maximal string of remaining line noise
characters to run the test rather than skipping it.

I'll have results on cygwin 1.7.0 later; there I had an additional failure
(I don't remember which at the moment), but that may have been due to
fewer cygwin packages being installed.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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testsuite.log.lzma
Description: Binary data