tejohnson added a comment. I was just typing up a response similar to @steven_wu 's response... I don't think clang should be in the business of caching the outputs of a prior clang invocation, the build system should and usually does avoid re-executing if the inputs have not changed. Note that this is very different from the caching of objects LTO is doing - because those are not otherwise emitted at all, the cache has to be built in.
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