Mail Archives: cygwin/2008/08/22/16:52:05
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According to Christopher Faylor on 8/22/2008 1:22 PM:
> On Fri, Aug 22, 2008 at 08:31:07PM +0200, Christian Franke wrote:
>> ... I could also reproduce this problem.
>
> Unfortunately, I can't.
>
> A simple test cause would be appreciated.
The parallel make is hit and miss; I've seen make go for quite some time
without failures. I'm also seeing occasional failures with gcc -pipe.
But it looks like I've finally stumbled on a 100% reproducible testcase,
in the m4 testsuite. /home/eblake/m4/build/src/m4 is a self-built m4 from
the latest m4.git; when I replace that string with /bin/m4, I don't see
the failure, so it might be something added in m4.git since m4 1.4.10b
that tickles the behavior; I'm still trying to set up a decent debugging
session to catch that. I'll continue trying to trim it down even further,
hopefully to a simple C program; but in the meantime, here's the testcase:
$ cat foo.m4
esyscmd(`echo 1m4exit' | /home/eblake/m4/build/src/m4) sysval
$ /bin/m4 foo.m4
/home/eblake/m4/build/src/m4: write error
1 1
The parent process uses popen() to implement esyscmd. The child m4 was
able to successfully write '1' to stdout (as evidenced by the fact that
the parent process read '1' from the pipe), but then reports a write error
during the atexit() handling. The expected behavior is to output "1 0",
with no error message.
- --
Don't work too hard, make some time for fun as well!
Eric Blake ebb9 AT byu DOT net
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