Re: Interest for C++20 modules support of boost officially

From: Ruben Perez (rubenperez038_at_[hidden])
Date: 2024-12-22 16:18:26

On Sun, 22 Dec 2024, 17:10 Peter Dimov, <pdimov_at_[hidden]> wrote:

> Ruben Perez wrote:
> > This is what I currently have. It's incomplete and will get some more
> work
> > today:
> >
> > https://github.com/anarthal/boost-cmake/tree/feature/cxx20-modules
> > https://github.com/anarthal/config/tree/feature/cxx20-modules
> > https://github.com/anarthal/assert/tree/feature/cxx20-modules
> > https://github.com/anarthal/throw_exception/tree/feature/cxx20-modules
> > https://github.com/anarthal/mp11/tree/feature/cxx20-modules
> > https://github.com/anarthal/core/tree/feature/cxx20-modules
>
> Regarding
>
>   boost_set_cxx20_module_settings(boost_assert)
>
> You can't rely on this function being available in a library's
> CMakeLists.txt
> file. Libraries (except those by Andrey) can be used without the
> superproject.
>

My assumption here was "modules only work with the superproject, either via
add_subdirectory or via install + find_package". I was likely too naive,
and the restriction should probably be lifted. How about providing the
function in a helper cmake script which must be included by code using
modules? We can always copy-paste the settings, but it can be a little bit
of a mess.