[Haskell-cafe] HPC and Template Haskell (GHC 7.8.3, Yesod)

David Turner dct25-561bs at mythic-beasts.com
Fri Dec 19 20:03:31 UTC 2014

[Failed to copy haskell-cafe in to my first response:]

I thought I had disabled profiling there, although it was enabled when
I was using cabal which wrote the original command line so that might
explain it.

I will try a more recent cabal-install this evening.

Thanks for the speedy response!

[Time passes - second response:]

I have tried cabal-install build from the latest revision (4aabb4f4b1)
with the same result. From a clean checkout of my source:

$ ~/cabal/cabal-install/.cabal-sandbox/bin/cabal configure
--disable-tests --enable-coverage --disable-profiling
$ ~/cabal/cabal-install/.cabal-sandbox/bin/cabal build -v

Similar outcome.

On 19 December 2014 at 18:53, Carter Schonwald
<carter.schonwald at gmail.com> wrote:
> i think the fix for this, or a related problem is merged into
> cabal/cabal-install head, and will be in 1.22
> does your problem go away if you dont enable profiled builds? (is so, its
> likely the same problem)
> On Fri, Dec 19, 2014 at 1:32 PM, David Turner
> <dct25-561bs at mythic-beasts.com> wrote:
>> Hi,
>> I'm having trouble making a HPC build of a Yesod application. It fails
>> with:
>> /usr/bin/ld: dist/build/StreamReading/Config.dyn_o: relocation
>> R_X86_64_PC32 against undefined symbol
>> `_hpc_tickboxes_tracszmenterprisezm0zi0zi0_Settings_hpc' can not be
>> used when making a shared object; recompile with -fPIC
>> I've narrowed it down to a call to ghc and posted the output in all
>> its gory detail at http://lpaste.net/116872 if that's any help.
>> Of note is that dist/build/Settings.dyn_o is unexpectedly missing from
>> the list of parameters to the last call to gcc, and the missing symbol
>> is defined in the same. There are, in fact, quite a number of missing
>> .dyn_o files in that list.
>> Slightly weirdly, when I run the same command line again, it seems to
>> work. At least, there are no errors reported and the exit code is 0.
>> Any ideas?
>> Cheers,
>> David
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