5.3: Emit coverage mappings for all modules #32389
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This reverts commit 499ed05. This changes the num-threads passed to 1 to avoid a multithreaded output issue on windows
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varungandhi-apple
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Sep 11, 2020
DougGregor
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Sep 11, 2020
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AnthonyLatsis
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swift 5.3
🍒 release cherry pick
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Previously in WMO builds where IR was multithreaded only the
primary module would emit the coverage mapping leading to only the first
object file to have the __llvm_covmap section. This change emits
coverage for all modules so they are correctly reflected in the final
coverage report.
This fixes forums.swift.org/t/code-coverage-with-wmo/32561
Fixes rdar://42562585
Fixes rdar://42562307