Turns out this was already a known issue: https://ghc.haskell.org/trac/ghc/ticket/9762 and a fix is now on the way for 7.10.1. In the meantime, adding -fomit-interface-pragmas works for me.
Thanks, David On 19 December 2014 at 21:58, David Turner <[email protected]> wrote: > Ok, I've opened https://ghc.haskell.org/trac/ghc/ticket/9909 > > I won't be able to repro on HEAD in the near future, I'm afraid. > > Many thanks, > > On 19 December 2014 at 21:32, Edward Z. Yang <[email protected]> wrote: >> Sounds like a bug. File a ticket? If you can see if you can >> repro on GHC HEAD that would also be helpful. >> >> Edward >> >> Excerpts from David Turner's message of 2014-12-19 16:24:25 -0500: >>> Hi, >>> >>> I'm getting the following error message when compiling a Yesod >>> application (which uses Template Haskell rather a lot) with -fhpc: >>> >>> /usr/bin/ld: ./Foundation.dyn_o: relocation R_X86_64_PC32 against >>> undefined symbol `_hpc_tickboxes_Settings_hpc' can not be used when >>> making a shared object; recompile with -fPIC >>> >>> Steps to reproduce: >>> >>> 1. Run 'yesod init' to make a new scaffold. Call it 'testsite' and >>> select 'simple' for no database. >>> 2. Run: >>> >>> cd testsite >>> sed Settings.hs -i -e 's/staticRoot conf.*/staticRoot conf = "foo"/' # >>> GHC doesn't like this line >>> ghc --make app/main.hs -XTemplateHaskell -XCPP -XOverloadedStrings >>> -XMultiParamTypeClasses -XTypeFamilies -fhpc -O1 >>> >>> Running the ghc line again completes successfully. >>> >>> It seems that there is a missing ./Settings.dyn_o in the gcc command >>> line that ghc calls, the first time through. It's there the second >>> time so the link succeeds. No idea what that might mean. >>> >>> It's not a problem at -O0. >>> >>> I'm using 7.8.3 so this might be fixed now. >>> >>> Not sure what else might help! Any advice gratefully received. >>> >>> Cheers, >>> >>> David _______________________________________________ ghc-devs mailing list [email protected] http://www.haskell.org/mailman/listinfo/ghc-devs
