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When the `--filter_sources` flag is used `LcovMerger` excludes from the merged coverage the sources whose names match any of the regex in the flag.
The value of `--filter_sources` is a list of regex separated by `,`.
This flag comes as a preparation for using `gcov` instead of `lcov` for collecting coverage data for C++. The flag was not needed before because `lcov` has some functionality for excluding some files (e.g. `--no-external` to ignore coverage data for system files).
Closes #5834.
PiperOrigin-RevId: 208606867
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This change comes as a preparation for using gcov for Bazel C++ coverage
instead of lcov.
See documentation of gcov intermediate format at https://gcc.gnu.org/onlinedocs/gcc/Invoking-Gcov.html#Invoking-Gcov
under --intermediate-format.
Change-Id: I6cd2df8b3a6611b187a2b0c161b14388413bc670
PiperOrigin-RevId: 206940660
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Fixes #5246
RELNOTES: None.
PiperOrigin-RevId: 203453340
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LcovMerger is a tool that merges all the intermediate lcov tracefiles (with .dat extension) found under a coverage directory and prints the merged tracefile to a given output file.
A custom implementation for merging lcov tracefiles is needed because the merging functionality of lcov itself is very slow.
LcovMerger is required to get a single coverage report (lcov tracefile) from a bazel coverage command that executes multiple tests.
ATM LcovMerger is only invoked by tools/test/collect_coverage.sh that collects and merges the tracefiles from a single test invocation. It will also be used from a CoverageReportAction.
Progress on #5246.
PiperOrigin-RevId: 200054506
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(series 2/4 of open-sourcing coverage command for java test)
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PiperOrigin-RevId: 141044216
MOS_MIGRATED_REVID=141044216
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iirina
Yue Gan