Rename CppRuntime_Clang/Gcc to CppRuntime_libcpp/libstdcpp.

[JohanEngelen]

Also adds libcpp and libstdcpp -target= option recognition.

https://forum.dlang.org/post/[email protected]

[dlang-bot]

Thanks for your pull request and interest in making D better, @JohanEngelen! We are looking forward to reviewing it, and you should be hearing from a maintainer soon.
Please verify that your PR follows this checklist:

• My PR is fully covered with tests (you can see the coverage diff by visiting the details link of the codecov check)
• My PR is as minimal as possible (smaller, focused PRs are easier to review than big ones)
• I have provided a detailed rationale explaining my changes
• New or modified functions have Ddoc comments (with Params: and Returns:)

Please see CONTRIBUTING.md for more information.

---

If you have addressed all reviews or aren't sure how to proceed, don't hesitate to ping us with a simple comment.

Bugzilla references

Auto-close	Bugzilla	Severity	Description
✓	24623	enhancement	Rename version CppRuntime_Clang/Gcc to CppRuntime_libcpp/libstdcpp.

Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub run digger -- build "master + dmd#16610"

[thewilsonator]

Needs a changelog entry and a spec PR(done: dlang/dlang.org#3852).

Surely we should deprecate the old ones first before removing them to allow transition? and give the user notice that the old versions will now not be set.

I otherwise approve of this. Thanks!

[JohanEngelen]

Surely we should deprecate the old ones first before removing them to allow transition? and give the user notice that the old versions will now not be set.

AFAICT there is no mechanism for deprecating version identifier names. But I've changed the code such that it still defines the old runtime names, such that it does not break any user code depending on it.

[JohanEngelen]

Probably the problem is that d_do_test is compiled by the host compiler, not by the just-built compiler...

[ibuclaw]

These names are equally, if not more confusing as the original (ie: libcpp is the GCC C PreProcessing library).

libstdc++v3 refers to itself as (lib)stdcxx in code.

Needs a bit more thought.

[JohanEngelen]

#16613

[JohanEngelen]

thanks Ian