Too much recompilation when changing test targets #3732
Expected: the second command should do nothing, as all tests, libraries, and executables have already been run.
Actual: I saw the following output:
Instead, we should track, for each package, the files needed on a per-component basis, and only rebuild based on this. This may tie in with @ezyang's work on per-component builds, not sure.
@tswelsh are you interested in taking a stab at this one?
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