Failure to catch C++ exception in Haskell on OS X

Gabor Greif ggreif at
Fri Jan 4 13:15:40 UTC 2019

Hi Bas,

maybe some DWARF unwind tables are not correctly installed in OS X?

Do intra-C++ exception catching work in your example?



On 1/4/19, Bas van Dijk <v.dijk.bas at> wrote:
> Dear GHC Devs,
> I'm debugging an issue in our haskell-opencv library where a C++ exception
> that is thrown by the OpenCV C++ library isn't caught by the C++
> try...catch block we have inlined in our Haskell code using inline-c-cpp.
> This results in the process terminating by SIGABRT.
> Note that this only happens on OS X. In Linux the exception is caught
> correctly.
> I wrote a minimal isolated test case (which doesn't use OpenCV) at:
> I wrote some instructions in the README on how to reproduce this and
> included some debugging notes.
> I'm not sure the bug is caused by a mis-configuration in my code or if it's
> a bug in nixpkgs, Cabal or GHC. Any idea what could be causing this?
> Bas

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