Build a new incr comp session dir from scratch every time#159287
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Build a new incr comp session dir from scratch every time#159287bjorn3 wants to merge 2 commits into
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This will allow introducing a separate incr comp session dir for the post LTO artifacts in the future. In addition it statically encodes the lifetime of the incr comp session rather than requiring an enum behind a mutex stored in the Session.
Rather than copying the old incr comp dir and then modifying it. This saves a copy/hardlink for files that are modified. And it removes the need for accurate work product tracking to avoid accumulating cruft, which is non-trivial. We don't accurately track the pre-LTO bitcode files for ThinLTO for example. FIXME cleanup
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Rather than copying the old incr comp dir and then modifying it. This saves a copy/hardlink for files that are modified. And it removes the need for accurate work product tracking to avoid accumulating cruft, which is non-trivial. We don't accurately track the pre-LTO bitcode files for ThinLTO for example.
Based on #159225
Part of rust-lang/compiler-team#908