Hassan Sajjad via SG15 <sg15_at_[hidden]> writes:

> The build system may use one-process-per-compilation with inter-process
> communication.

Or the build system may communicate with the compiler itself via
inter-process communication. This will allow you to sidestep most
of the issues listed by Tom. FYI:

https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p1184r2.pdf

https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1842r0.html