Cgo without a C toolchain

[matloob]

On the go project we're planning to add support for using Cgo without a C toolchain. Here's the proposal: golang/go#81450

[mappu]

Wow, that's super interesting -

There is definitely demand for a CGO-free version of Miqt e.g. this fork or this fork. By comparison, I love how your proposal only deals with plain source rather than precompiled binaries (either syscall/purego or syso files).

It seems like this will solely use the internal linker, though, so I don't think it would work yet for Miqt, because Go's internal linker doesn't seem to handle all the special C++ constructs used in Qt dlls, we need the extld from an external C++ toolchain. (See #147).

Theoretically it could reduce a precompiled interface down to only the C-C++ half of Miqt, though, like this fork.

Regardless of whether this proposal helps Miqt or not, I think it's a very good move for most simple Go-C binding libraries.