Hi all, I have a patch that effects profiling code and I realized neither `./validate --fast` nor `./validate` test the "prof" way so I tried `./validate --slow`. I saw that even on a clean branch I get 250 unexpected failures and 6 unexpected passes. I had a quick look at logs. Most of the failures seem to be in these formats: - Compile failed (exit code 1) errors were: T6005a.hs:1:1: fatal: Cannot load -prof objects when GHC is built with -dynamic To fix this, either: (1) Use -fexternal-interpreter, or (2) Build the program twice: once with -dynamic, and then with -prof using -osuf to set a different object file suffix. - Compile failed (exit code 1) errors were: T5984_Lib.hs:3:8: error: Could not find module ‘Prelude’ Perhaps you haven't installed the "p_dyn" libraries for package ‘base-4.10.0.0’? Use -v to see a list of the files searched for. T5984_Lib.hs:5:1: error: Could not find module ‘Language.Haskell.TH’ Perhaps you haven't installed the "p_dyn" libraries for package ‘template-haskell-2.12.0.0’? Use -v to see a list of the files searched for. But there are also some serious-looking failures, like =====> hpc_fork(hpc) 5717 of 5834 [6, 245, 0] ... +++ "/tmp/ghctest-yrj0el9g/test spaces/../../libraries/ghc-compact/tests/compact_share.run/compact_share.run.stdout.normalised" 2017-03-24 00:38:02.486282332 +0300 @@ -1,4 +1,4 @@ 275599 -3801088 +6291456 275599 -2228224 +3506176 So it seems at this point there's basically no realiable way to test profiling changes. I was wondering if someone here know anything about these. If anyone's interested, I pushed test output of `./validate --slow` here: (9.2M file) https://gist.githubusercontent.com/osa1/7cbcc8303f1e213a10accf0bcd9b5ab2/raw... Ömer