Booting ghc with system-wide installed Cabal?

Ömer Sinan Ağacan

26 Jun 2018 26 Jun '18

2:57 a.m.

Currently we have to build Cabal from scratch after every make clean. Ideally I should be able to skip this step by installing the correct versions of Cabal and cabal-install system-wide, but as far as I can see we currently doesn't support this. Any ideas on how to make this work? Thanks, Ömer

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Niklas Larsson

26 Jun 26 Jun

3:26 a.m.

Installing stuff system-wide without doing ‘make install’ would break my expectations for how the build works. Also, how would one return to a pristine state if it was done that way? // Niklas

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26 juni 2018 kl. 08:57 skrev Ömer Sinan Ağacan :

Currently we have to build Cabal from scratch after every make clean. Ideally I should be able to skip this step by installing the correct versions of Cabal and cabal-install system-wide, but as far as I can see we currently doesn't support this. Any ideas on how to make this work?

Thanks,

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

Ömer Sinan Ağacan

3:31 a.m.

We don't have to break anyone's workflow. We could introduce an ENV var or a flag for this.

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Also, how would one return to a pristine state if it was done that way?

By unsetting the ENV var or not using the flag. Ömer Niklas Larsson , 26 Haz 2018 Sal, 10:26 tarihinde şunu yazdı:

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Installing stuff system-wide without doing ‘make install’ would break my expectations for how the build works. Also, how would one return to a pristine state if it was done that way?

// Niklas

...
26 juni 2018 kl. 08:57 skrev Ömer Sinan Ağacan :

Currently we have to build Cabal from scratch after every make clean. Ideally I should be able to skip this step by installing the correct versions of Cabal and cabal-install system-wide, but as far as I can see we currently doesn't support this. Any ideas on how to make this work?

Thanks,

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

Ben Gamari

2 Jul 2 Jul

3:48 p.m.

Niklas Larsson writes:

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Installing stuff system-wide without doing ‘make install’ would break my expectations for how the build works. Also, how would one return to a pristine state if it was done that way?

Hmm, I was assuming it would be up to the user to ensure that a compatible Cabal is already registered in the user's package database. Regardless, as I said in my other message, it's not clear to me that this is something that we really want to introduce complexity to support. Cheers, - Ben

Ben Gamari

3:46 p.m.

Ömer Sinan Ağacan writes:

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Currently we have to build Cabal from scratch after every make clean. Ideally I should be able to skip this step by installing the correct versions of Cabal and cabal-install system-wide, but as far as I can see we currently doesn't support this. Any ideas on how to make this work?

Indeed we currently don't support this since ghc-pkg uses the Cabal API which changes from release to release. I suspect you could hack Hadrian to make this work (assuming you guaranteed that the system Cabal is compatible with the in-tree version), but I'm not sure it's something that we really want to encourage users to do. Cheers, - Ben

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Ben Gamari
Niklas Larsson
Ömer Sinan Ağacan