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Chandler Carruth
3930fb13a5
This is the first real step towards building libc++ itself, and fleshes out both the core runtimes management logic and the archive-based runtimes logic for a quite simple runtime. Nothing here causes us to _use_ libunwind, and in fact this doesn't include even the "on-demand" aspect of building `libunwind`. Instead, this just wires it up to the explicit `build-runtimes` subcommand for simple testing. The full integration along side the target directory is future work.