HEADS UP: bugs in GHC 6.12.2
marlowsd at gmail.com
Wed May 12 04:41:04 EDT 2010
I'm sorry to say that in GHC 6.12.2, as a result of fixing a couple of
bugs in 6.12.1, we (well, I) managed to introduce some more serious ones:
The first causes gtk2hs programs to crash, and we have a report of it
affecting hmatrix too. There's no workaround unfortunately: the problem
is that we changed some data structures related to FFI calls, with the
result that a nested callback (calling out to C, back to Haskell, out to
C again and back to Haskell in the same thread) can result in a crash or
a bogus result.
The second causes lazy bytestring's hGetContents to block waiting for a
full buffer, when it should just return the data already read. You can
work around this by using bytestring-0.9.1.5 instead of the supplied
We'll put out 6.12.3 with fixes for these as soon as possible. In the
meantime, if you are still on 6.12.1 and not encountering any problems,
I don't recommend upgrading.
Sorry for the inconvenience.
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