Add a GnuComment workflow that runs after GnuTests completes on a pull
request, downloads the 'comment' artifact (PR number + comparison text), and
posts it as a PR comment. Mirrors ../sed's GnuComment workflow.
Add a GnuTests workflow that, on push and PR, fetches the GNU grep release
tarball, builds the Rust grep binary, runs util/run-gnu-testsuite.sh, and
uploads the JSON results. An aggregate job compares the run against the
reference summary from the default branch (util/compare_test_results.py,
borrowed from ../sed) and fails only on new, non-intermittent regressions;
known-flaky tests are listed in .github/workflows/ignore-intermittent.txt.
The test suite spawns the grep binary inside per-test temporary
directories (via uutests). With a relative LLVM_PROFILE_FILE, each
subprocess wrote its .profraw into that tempdir, which gets deleted
when the test ends, so the binary executing the src/ code left no
coverage data and grcov reported every line as a miss (0%).
Anchoring the path to the workspace root makes the profraw files
survive, raising reported coverage from 0% to ~96%.
oech3
codspeed-hq[bot]
Sylvestre Ledru