[clang][cas] Avoid calling freezeConfig for every cache key #9803
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With the libclang caching APIs, it is possible to configure CASOptions separately from the CAS used for scanning. In this setup, the CAS is not pre-cached in the CASOptions and ends up being re-opened for every cache key, which is expensive with some plugin CAS. Instead, get the hash identifier from the already open CAS and only freezeConfig when canonicalizing for an actual compilation. rdar://141555438
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@swift-ci please test llvm |
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With the libclang caching APIs, it is possible to configure CASOptions separately from the CAS used for scanning. In this setup, the CAS is not pre-cached in the CASOptions and ends up being re-opened for every cache key, which is expensive with some plugin CAS. Instead, get the hash identifier from the already open CAS and only freezeConfig when canonicalizing for an actual compilation.
rdar://141555438