Re: ghc-stage2 —interactive segfaults on Mac OS X 10.11.6 (build flavour = prof)

[Alfredo Di Napoli]

Hey Ben,

yes, it’s consistently reproducible. I have tried compiling GHC from
scratch by adding `-dcore-lint` and `-debug` to GhcStage2HcOpts in my mk/
build.mk, but eventually the build process failed with:

ld: library not found for -lHSrts_thr_debug_p

Any idea what am I doing wrong? Next I’m going to try enabling `-DDEBUG`
only as described here:

https://ghc.haskell.org/trac/ghc/wiki/Debugging/Compiler

To see if I get any further.

Thanks!

A.


On 13 April 2017 at 19:01, Ben Gamari <ben at smart-cactus.org> wrote:

> Alfredo Di Napoli <alfredo.dinapoli at gmail.com> writes:
>
> > Hey all,
> >
> > I’m trying to compile GHC HEAD (cloning from master) with the `prof`
> build
> > flavour on a Mac OS X 10.11.6 machine and I have noticed that, despite
> > ghc-stage2 works as expected, when invoked with —interactive it starts
> > before crashing with a segmentation fault:
> >
> > ```
> > ☁  compiler [master] ⚡ ../inplace/bin/ghc-stage2 --interactive
> > GHCi, version 8.3.20170413: http://www.haskell.org/ghc/  :? for help
> > [1]    79176 segmentation fault  ../inplace/bin/ghc-stage2 --interactive
> > ```
> >
> > Did it happen to somebody else or it’s just me? Shall I try throwing gdb
> at
> > it to try and see what’s going on?
>
> Hmm, interesting. I've not seen crashes like this locally nor in CI. It
> would be great if you could try to get some insight. Is this crash
> perfectly reproducible?
>
> It may be worth adding -dcore-lint to GhcStage2HcOpts to ensure the code
> we are producing is sane.
>
> Cheers,
>
> - Ben
>
>
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