[Nix-dev] builderDefs, composedArgsAndFun

[maggesi at math.unifi.it]

Ok, thank you for your explanation.
Marco


Quoting Michael Raskin <7c6f434c at mail.ru>:

>> Hi,
>>
>> there are some functions in nixpkgs that I always avoided to use   
>> and understand.
>> A couple of them are builderDefs and composedArgsAndFun.
>> I'm reading their implementation right now but they don't look   
>> straightforward to me.
>> Can someone give me a hint on what they do or point me to some   
>> documentation?
>
> builderDefs compose build process out of phases instead of running
> always the same functions, although some of executions of some of the
> functions do nothing.
>
> It was written before there was any reasonable overriding in Nixpkgs to
> provide overriding (sometimes changing preConfigure with overrides is
> still hard). Also, it doesn't require additional tricks for passing $out
> in configureFlags and it is possible to add a new archive format support
> in trunk with out a rebuild (and overall it controls more of the build
> choices on Nix-language level, instead of in the bash script).
>
>> In particular, i would like to update the expression for the Io   
>> language which is now old (2008) which employ builderDefs.
>
> If it is a complete rewrite because Io's build system is now
> rewritten upstream, there is no reason to care about my old
> expression.




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