Question to implementers: Moduels vs libraries

[Loïc Joly]

Hello,

I know the language does not have the notion of library. But every
compiler has some. And I wondering if there is any interaction between
your implementation of modules and the notion of library, or if both are
totally orthogonal. More specifically:

- Can different module units of a unique named module be grouped into
several different libraries (static or dynamic, if that changes anything)?

- Can a single library (static or dynamic) contain module units from
different named modules?


---

Loïc

[Richard Smith]

On Wed, 14 Mar 2018, 12:30 Loïc Joly, <loic.act...@numericable.fr> wrote:

Hello,

I know the language does not have the notion of library. But every
compiler has some. And I wondering if there is any interaction between
your implementation of modules and the notion of library, or if both are
totally orthogonal.

(Talking about the clang implementation below.)

More specifically:

- Can different module units of a unique named module be grouped into
several different libraries (static or dynamic, if that changes anything)?

Currently yes. We have considered giving module-linkage entities hidden visibility by default (which would mean you get better codegen but that a module can't span a dynamic library boundary -- unless you turn that feature off), but the current language rules make that tricky or infeasible -- particularly, a template defined in the module but instantiated outside might refer to a module linkage symbol.

- Can a single library (static or dynamic) contain module units from
different named modules?

Yes.

---

Loïc



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[Loïc Joly]

Thank you Richard for this information.

Any feedback from VC++/GCC?

---
Loïc Joly

Le 14/03/2018 à 17:50, 'Richard Smith' via SG2 - Modules a écrit :
> On Wed, 14 Mar 2018, 12:30 Loïc Joly,
> <loic.act...@numericable.fr