ChuanqiXu added a subscriber: rsmith.
ChuanqiXu added a comment.
@rsmith told me that the ideal situation would combine C++20 modules and clang
modules together in D113391 <https://reviews.llvm.org/D113391>
I think the most important thing here is to get in consensus for the module
status. Here might be some helpful questions for the goal:
- Should C++20 modules and Clang modules be exclusive from each other?
- If yes, we could take the idea ` -fmodules= {clang, c++20, none...} ` and
forbid the combination of `-fmodules -std=c++20`. And we could use variable
`Modules` to indicate clang modules and `CPlusPlusModules` to indicate c++20
modules.
- If no, it implies that we could use c++20 modules and clang modules together.
So the combination of `-fmodules -std=c++20` or even `-fmodules -fcxxmodules`
makes sense. It implies that we could use the grammar of clang module extension
or c++20 modules. This is decision from D113391
<https://reviews.llvm.org/D113391>. Here are some further questions:
- Would it be very hard to implement or maintain?
- We lack a variable to indicate clang modules only. Currently, we couldn't
use `Modules` to indicate clang modules since `Modules` is true if we turned
C++20 modules on. `Modules` indicate either clang module or c++20 module is
enabled. Or we could think it means the common parts of the two features.
The most important technical question might be `Would it be very hard to
implement or maintain?`. From my experience, I think it is implementable. But I
**feel** it is not easy to maintain. We don't have the experience since C++20
modules are not in the state of maintaining now.
I don't have strong opinions for the concrete decision. But I think it is very
important to get in consensus. @iains @Bigcheese
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D120540/new/
https://reviews.llvm.org/D120540
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