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

From: Peter Dimov (pdimov_at_[hidden])
Date: 2024-12-22 16:06:23

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

I don't think BOOST_CXX20_MODULE is the right name. Macros prefixed
with BOOST_CXXnn_ indicate feature availability. The modules macro would
be called BOOST_CXX20_NO_MODULES, because we use negative macros.

(And BOOST_CXX23_NO_STD_MODULE, respectively.)

What we need here is not an availability macro (are C++20 modules
supported by the compiler?) but a user configuration macro (I want to
use Boost as modules.)

It should be something like BOOST_USE_MODULES, for instance.