Andrew Tridgell 1d5b5ab83a build: add gcov coverage and --disable-openat2 knobs for the test suite ...

Two test-coverage build knobs (both behaviour-neutral by default):

  --enable-coverage  appends '--coverage -fprofile-update=atomic -O0' and adds
                     a 'make coverage' target (whole suite, run serially, then
                     gcovr HTML with branch + decision coverage). rsync forks
                     and its children exit without running the gcov atexit
                     flush -- the generator via its SIGUSR1 handler
                     (_exit_cleanup) and the receiver via the SIGUSR2 handler
                     -- so under GCOV_COVERAGE we call __gcov_dump() at both, or
                     receiver.c/generator.c record no coverage at all.

  --disable-openat2  gates the Linux openat2(RESOLVE_BENEATH) sites in syscall.c
                     on HAVE_OPENAT2 (defined by default), so disabling it forces
                     the portable per-component O_NOFOLLOW resolver to run as the
                     primary on ordinary Linux -- exercising and
                     coverage-counting that fallback tier without a pre-5.6
                     kernel. NOTE: coordinate with the parallel syscall.c
                     path-resolution restructure.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-24 12:31:52 +10:00

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