[PATCH] D140959: RFC: Multilib prototype

[Michael Platings via Phabricator via cfe-commits]

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I've created a new stack of changes taking into account the feedback. Unlike this change which was strictly a prototype, the new changes should be suitable for detailed review and hopefully approval.

- https://reviews.llvm.org/D142878 - Add testing for Fuchsia multilib
- https://reviews.llvm.org/D142893 - Class for building MultilibSet
- https://reviews.llvm.org/D142905 - Change multilib selection algorithm
- https://reviews.llvm.org/D142932 - Multilib YAML parsing
- https://reviews.llvm.org/D142933 - Add -print-multi-selection-flags argument
- https://reviews.llvm.org/D142986 - Enable multilib.yaml in the BareMetal ToolChain

I'm working on further patches to enable multilib layering, but that needn't block the above changes.

Thanks for giving it a try @Joe. The new changes are by design much more limited, in order to avoid creating an unstable API. I'd be interested to learn from you whether it's suitable for what you need, possibly by adding more functionality. In particular you'll see that https://reviews.llvm.org/D142933 has functionality specific to Arm extensions so something similar may be required for other architectures.

In D140959#4028638 <https://reviews.llvm.org/D140959#4028638>, @tschuett wrote:

> Did you look at Yaml I/O <https://llvm.org/docs/YamlIO.html>?

Thanks for the tip, I've used it in https://reviews.llvm.org/D142932 and it's a great improvement.


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