Commit a4d211ee authored by Drew's avatar Drew

Support Xcode 8 GM

* Drop test coverage for Xcode 7 since it's likely not installed
* We now pull paths from xcode-select when we don't specify a toolchain which is saner than using hardcoded paths
* We now more robustly test if a given toolchain is from xcode 7 or not rather than rely on the filename
* Bootstrap for Xcode 8 installed to
parent 3255fef3
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