clang-scan-deps is required for CMake 3.28 C++ 20 module support

[ShuangLiu1992]

In
https://chromium.googlesource.com/emscripten-releases/+/refs/heads/main/src/build.py
clang-scan-deps is in the list of unneeded_tool, but it is required by cmake to scan dependencies of cxx 20 modules.
is it possible to include "clang-scan-deps" in emscripten releases?

[sbc100]

Sounds reasonable to me. @dschuff WDYT?

[dschuff]

Yeah, I think it would be fine to just add that to the emscripten-releases build.

[dschuff]

https://chromium-review.googlesource.com/c/emscripten-releases/+/5182235

[ShuangLiu1992]

thank you

[sxstd001]

Please provide detailed instructions on how to proceed? Specifically, how can I compile C++20 modules, and what is the proper configuration for CMake?

[sxstd001]

**if I use Ninja in clion ide compiles wasm, errors: **
clang++: error: unknown argument: '-fmodules-ts'
clang++: error: unknown argument: '-fdeps-file=CMakeFiles/wasm.dir/main.cpp.o.ddi'
clang++: error: unknown argument: '-fdeps-target=CMakeFiles/wasm.dir/main.cpp.o'
clang++: error: unknown argument: '-fdeps-format=p1689r5'