Not possible to build debug + prof, oversight or expected?

Ben Gamari ben at
Wed Jul 4 14:54:30 UTC 2018

Ömer Sinan Ağacan <omeragacan at> writes:

> I just realized GHC 8.4.2 doesn't ship a debug + prof RTS, and HEAD doesn't
> build it with release build (no or with prof flavor. It seems to me
> that this is a bug, because some debug files in RTS (e.g. Printer.c) actually
> check PROFILING macro in a few places and print different stuff depending on
> that.
> Anyone know if this is intentional? It's really inconvenient that I can't use
> debug runtime to debug profiling build issues..
Hmm, it sounds like a bug. I see debug_p in mk/ It looks like
it's missing from GhcRTSWays, however (defined in mk/


- Ben
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