Linker error (TemplateHaskell + HPC?)

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.

1. Run:

cd testsite
ghc --make app/main.hs  -XTemplateHaskell -XCPP -XOverloadedStrings -XMultiParamTypeClasses -XTypeFamilies -XQuasiQuotes -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.

Trac metadata

Trac field	Value
Version	7.8.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system	Unknown/Multiple
Architecture	Unknown/Multiple