Re: use Hadrian to see if compiler compiles?

[Richard Eisenberg]

> On Jan 25, 2022, at 2:15 PM, Norman Ramsey  wrote:
> 
> Cool!  Supposing I wanted to run just a little code that uses the GHC API.
> Would there be a way to load the Prelude and similar things into that GHCi,
> so it could know about Bool and IO and such things?


The GHCi that runs is your system's GHCi, so it has access to everything 
installed in your bootstrap GHC. However, I don't see a connection between your 
second sentence and your last sentence: that is, the GHCi will certainly know 
about Bool and IO, but I don't see how that helps with the GHC API. I have no 
idea how you would use the GHC API in this mode. My advice would be to use this 
trick to get quick feedback about compilation, and then once GHC compiles, use 
other more well-worn techniques to build it and test your application.

Richard

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Re: use Hadrian to see if compiler compiles?

[Norman Ramsey]

 > My recommendation: ./hadrian/ghci. The first time you run it, it may spin
 > for a little while, but it will eventually deliver you to a GHCi prompt,
 > with all of GHC loaded. (You can e.g. `:type splitTyConApp_maybe`, after
 > `import GHC.Core.Type`.) At that point, :reload will be your dear friend.
 > That's what I do when I'm doing e.g. module reorganization and care much
 > more about "does it compile" than "does it work".

Cool!  Supposing I wanted to run just a little code that uses the GHC API.
Would there be a way to load the Prelude and similar things into that GHCi,
so it could know about Bool and IO and such things?


Norman
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