Build a new incr comp session dir from scratch every time - #159287
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bjorn3 wants to merge 6 commits into
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Build a new incr comp session dir from scratch every time#159287bjorn3 wants to merge 6 commits into
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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.
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It is already copied by copy_cgu_workproduct_to_incr_comp_cache_dir in Linker::link.
Missing work products should never happen, but if it does, clearly some corruption happened and we shouldn't try reusing the rest of the artifacts in the old session dir.
So another rustc instance can't remove it under our feet.
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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.
Part of rust-lang/compiler-team#908