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Optionally enable LLVM profile continuous mode #15166

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Optionally enable LLVM profile continuous mode #15166

wants to merge 1 commit into from

Commits on Apr 3, 2022

  1. Optionally enable LLVM profile continuous mode 

    LLVM's profile instrumentation offers a continuous mode in which
counters are continuously synced to a file rather than being dumped
once in an exit hook. This is useful for coverage runs that include
binaries that exit abnormally (e.g. in failure tests), but may require
additional compiler flags and can negatively impact runtime performance
and memory usage.

Enabling continuous mode requires adding the "%c" modifier to the value
of the LLVM_PROFILE_FILE environment variable. With this commit, the
collect_coverage.sh script adds the modifier if the test environment has
the variable LLVM_PROFILE_CONTINUOUS_MODE set. This allows both all and
individual tests to use continuous mode by setting the variable, either
via --test_env or the env attribute.
    @fmeum
    fmeum committed Apr 3, 2022
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