[RFC] subsystems vs. modules

[Robert Goldman]

This discussion makes me worried that `if-feature` dependencies may not 
function properly in ASDF. AFAIK ASDF still relies only on the file 
system to determine whether a file needs recompilation.  But changing 
feature values are not, in general, visible in the file system. So I 
believe that use of `:if-feature` could cause ASDF to fail to recompile 
files when it should.

See this issue: https://gitlab.common-lisp.net/asdf/asdf/-/issues/117

If anyone has time to check my work on this, I would be grateful.

We may need to project feature state into the filesystem in order to fix 
this problem.

On 18 May 2022, at 6:27, Didier Verna wrote:

> Wilfredo Velazquez <zulu.inuoe at gmail.com> wrote:
>
>> Sorry in advance for not exactly answering your question, but out of
>> curiosity, what would 'conditionally included' entail exactly?
>
>   Conditional in the ASDF sense, that is...
>
>> BTW See ASDF's `:if-feature` option.
>
>   ... exactly that, or :feature, etc.
>
> -- 
> Resistance is futile. You will be jazzimilated.
>
> Lisp, Jazz, Aïkido: http://www.didierverna.info
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