> I have a bug which I'm having trouble reproducing on a small scale, so
> I'm not sure how to proceed to get more information to you.
>
> When I use ghc --make to recompile a group of files, I sometimes get a
> segfault when running the target program. If I remove all of the .o
> files and compile again, I do not get the segfault. If I remove just
> the changed .o files and the executable and recompile, I still get the
> segfault.
>
> I'm not using any unsafe IO as far as I know, though I am using Happy
> and Alex.
>
> I searched around for a while about methods for debugging ghc, but
> didn't find much. It doesn't look like its a gc bug since I tried
> giving a big heap size and had no effect. Can I rebuild ghc or my
> target program in some way to get more debugging information to you?
> Unfortunately, I can't post my entire program.
Could be a problem with the recompilation checking. We know of one such
bug: if you compile first with -O, then later without -O,
inconsistencies can arise.
If your problem is not of this form, then it would help greatly if you
could provide us with a repeatable example (indeed, it will probably be
impossible to track down without one). The next time it happens, just
tar up the tree and send it to us, and if you can provide a description
of which changes were made recently to the tree that would help too.
Cheers,
Simon
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