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Subject: Re: P2473R0: Distributing C++ Module Libraries
From: David Blaikie (dblaikie_at_[hidden])
Date: 2021-10-15 12:21:11


On Fri, Oct 15, 2021 at 10:07 AM Gabriel Dos Reis via SG15 <
sg15_at_[hidden]> wrote:

>
> - While it's true that they don't have hierarchical significance, the
> name is a list of identifiers separated by dots. The natural word separator
> for the file system is a hierarchy.
> -
>
>
>
> Modules should reflect source code architecture, not a particular
> filesystem idiosyncrasies.
>
>
>
> 'stat'ing the file system all the way is something we have 40+ painful
> experience with ('#include); consuming an inode per module components
> (Perl's way) is something we have 30+ years of painful experience with.
>

Have you got a link to or otherwise summarize the sort of pain you're
referring to/would hope to avoid?

> We should exercise caution with reflexively copying whatever we are
> familiar with. For familiarity may not necessarily be the answer to our
> problems.
>
>
>
> -- Gaby
>
>
>
> *From:* SG15 <sg15-bounces_at_[hidden]> *On Behalf Of *Daniel Ruoso
> via SG15
> *Sent:* Friday, October 15, 2021 9:38 AM
> *To:* iain_at_[hidden]
> *Cc:* Daniel Ruoso <daniel_at_[hidden]>; sg15_at_[hidden]
> *Subject:* Re: [SG15] P2473R0: Distributing C++ Module Libraries
>
>
>
> On Fri, Oct 15, 2021 at 12:22 PM Iain Sandoe <iain_at_[hidden]> wrote:
>
> .. I had a question on the periods in module names (which might just mean
> I'm kinda new to the group and missed some previous design discussion)
> These have no hierarchical significance to the compiler, what problem is
> it solving to make them have disk layout hierarchy in the tooling?
>
>
>
> While it's true that they don't have hierarchical significance, the name
> is a list of identifiers separated by dots. The natural word separator for
> the file system is a hierarchy.
>
>
>
> Now, apart from the strict reading of the standard, we have plenty of
> prior art in other languages for the translation of the word separator in
> the module name to the path separator in the file system, e.g.: Perl,
> Python, Java, Rust. Fortran doesn't seem to allow word separators in module
> names (haven't read the entire docs for it), and Golang uses an
> opaque string (intended as an URI, IIUC) as the identifier.
>
>
> It also allows the filesystem usage to be smarter, instead of ending with
> a flat directory with all the module files in it.
>
>
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