Running tests on unregisterised/no-SMP builds

[matoro]

Hi, when attempting to run the test suite on no-SMP builds of GHC, it errors out with unknown RTS option: -N due to the hardcoded -with-rtsopts=-N. Currently, unregisterised builds of GHC imply no-SMP, which means the test suite cannot be run on platforms where only unregisterised GHC is supported.

Could passing this option to the test suite be made conditional on a GHC build with SMP support?

[tomjaguarpaw]

Sounds plausible. Is it convenient for you to come up with a PR so I can see what it would look like?

[matoro]

Sounds plausible. Is it convenient for you to come up with a PR so I can see what it would look like?

I wish, sorry. Unfortunately I don't know any Haskell - this is just from the perspective of a distro maintainer trying to build this package on unregisterised platforms.

[tomjaguarpaw]

I see. Well, I will add it to my TODO list, but unfortunately that list is very long. Please do come back and complain again if it continues to cause you pain. Perhaps in the meantime some other kind volunteer can help.

[hololeap]

Sorry for the force-push spam.

[tomjaguarpaw]

Thanks! @hololeap can you tell us what the commands are for running the test suite with and without the smp flag? I don't use stack so I'm not familiar with how that would work.

[hololeap]

I don't use stack either, but you can generate a .cabal file with hpack. Then you would just run

cabal configure --enable-tests --flag=-smp

to turn off the smp flag before building/testing.

[hololeap]

It looks like with stack, you would use

stack build --flag typed-process:-smp

[tomjaguarpaw]

Great. @matoro, can you confirm this does the job for you?

[hololeap]

For an ebuild (gentoo), you could do something like

src_configure() {
	if ghc-supports-smp; then
		local smp_flag=smp
	else
		local smp_flag=-smp
	fi
	
	haskell-cabal_src_configure \
		--flag="${smp_flag}"
}

[hololeap]

@matoro here is a patch that you can plug into dev-haskell/typed-process/files/:
https://gist.github.com/hololeap/c4316ab07cdf836ddc604ba8736159c3