testsuite failure on cygwin

[Eric Blake]

Seeing as how I haven't uploaded 2.67 yet (any day now, once my upload
key privileges are in place...), I took the time to run the testsuite on
cygwin.  I had to kill a hang in one of the parallel tests, since cygwin
named fifos still misbehave in cygwin 1.7.5, but that's not autoconf's
problem (we document it in BUGS, at any rate).  But there were also a
couple of new, unexpected failures.

253: AC_LANG_SOURCE example                          FAILED (compile.at:191)
254: AC_LANG_PROGRAM example                         FAILED (compile.at:232)

It turns out that this line (in both tests):

gcc -E -dD -o - conftest.c || AS_EXIT([77])

is not portable to cygwin, where gcc currently compiles ./-.exe rather
than outputting to stdout.  Do we really need the '-o -' in that command
line?  And should I be reporting the surprising behavior of creating
-.exe as a gcc/cygwin bug to the appropriate folks?

-- 
Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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