I'm a maintainer of a GHC package in pkgsrc - a package collection mainly used by NetBSD. Our package has the following patch to ghc/ghc.mk to work around the problem. The issue is that, while ghc/ghc-bin.cabal.in has a flag to link against non-threaded RTS, the build system doesn't propagate GhcThreaded to it:

--- ghc/ghc.mk.orig 2019-08-25 12:03:36.000000000 +0000 +++ ghc/ghc.mk @@ -61,7 +61,13 @@ ifeq "$(GhcThreaded)" "YES" # Use threaded RTS with GHCi, so threads don't get blocked at the prompt. ghc_stage2_MORE_HC_OPTS += -threaded ghc_stage3_MORE_HC_OPTS += -threaded +else +# Opt out from threaded GHC. See ghc-bin.cabal.in +ghc_stage2_CONFIGURE_OPTS += -f-threaded +ghc_stage3_CONFIGURE_OPTS += -f-threaded endif +# Stage-0 compiler isn't guaranteed to have a threaded RTS. +ghc_stage1_CONFIGURE_OPTS += -f-threaded

ifeq "$(GhcProfiled)" "YES" ghc_stage2_PROGRAM_WAY = p

On 2020-01-15 20:16, Ömer Sinan Ağacan wrote:

I just realized that the wiki page for ticky profiling [1] suggests using `GhcThreaded = NO` becuase ticky profiling is not compatible with threaded runtime.

I think this suggests that `GhcThreaded = NO` used to work. It doesn't work anymore.

Ömer

[1]: https://gitlab.haskell.org/ghc/ghc/wikis/debugging/ticky-ticky

Ömer Sinan Ağacan , 15 Oca 2020 Çar, 14:11 tarihinde şunu yazdı:

...

Btw I just realized that this also makes ticky-ticky profiling harder becuase as far as I know ticky profiling not compatible with threaded runtime. I need to try ticky profiling for !1747 and I'm currently painfully manually linking the stage 2 executable using the method I described in my original email.

Ömer

Brandon Allbery , 9 Oca 2020 Per, 18:10 tarihinde şunu yazdı:

...

There are some hidden dependencies, in particular ghci requires GhcThreaded last I checked (and ghci == ghc --interactive, not a separate program that could be linked threaded). You may also have to disable the entire bytecode backend, which would take TH and runghc with it as well as ghci.

On Thu, Jan 9, 2020 at 8:02 AM Ömer Sinan Ağacan wrote:

...

Anyone know how to link stage 2 with non-threaded RTS using Make build system? There's a variable GhcThreaded, but setting it "NO" makes no difference, stage 2 compiler is still threaded.

So far the only way I could find is to redirect build system output to a file, find the step that linked ghc-stage2, repeat that command but without -threaded. It's really painful as I have to repeat this step after every rebuild.

Any tips?

Thanks,

Ömer _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs

-- brandon s allbery kf8nh allbery.b@gmail.com

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