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
