Add ImportC compiler to dmd

[Gregor Mückl]

On Sunday, 9 May 2021 at 20:57:06 UTC, Walter Bright wrote:
> https://github.com/dlang/dmd/pull/12507
>
> If you could add a C compiler to dmd with 3000 lines of code, 
> so C code could be imported directly? I would!

How does this impact gdc as part of GCC? GCC already has a C 
compiler, so this could be seen as some kind of duplication of 
features/effort from their perspective.