[cfe-dev] Will Clang use PCH format to implement C++20 module system?

[David Blaikie via cfe-dev]

On Mon, Jan 6, 2020 at 2:28 AM Yafei Liu via cfe-dev <cfe-dev at lists.llvm.org>
wrote:

> Hi all, I'm curious if the PCH format will be used to implement C++20
> module system? Any Clang community discussions or documents on this?
>

More or less. The basic AST serialization system is already shared between
PCH, Clang Header Modules, and preliminary support for C++20 Modules. Not
exactly the same, because the semantics of each are slightly different -
but the core AST serialization is common across all 3.


> What's more, I'm inventing a language using LLVM, and I want to generate
> some middle layer to communicate with c++ module, so is there any tools or
> apis to generate a PCH?
>

None that I know of. The only cross-language binding like that that I know
of is Swift, which is one-way to the best of my knowledge (so Swift doesn't
have to generate Clang-compatible AST files (PCH/PCM/whatever) - it only
has to be able to read them). I imagine Swift's binary module
representation might be similar for ease of interoperability, but I don't
actually know.

- Dave
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