27 May
2018
27 May
'18
6:30 p.m.
For some more technical background, the "InfoTableProf" module is only built/needed when it is used with PROFILING. It uses CPP to "peek" into the StgInfoTable, which changes under profiling.
I think my issue was that nixpkgs.ghcHEAD configurePhase was overwriting my build.mk. That might explain why profiling was enabled.