git bisect start
# status: waiting for both good and bad commits
# good: [fc54ab94ad257f9ef43a7287a60c21734a7a288f] gcc-changelog: accept "CWG nnnn" header
git bisect good fc54ab94ad257f9ef43a7287a60c21734a7a288f
# status: waiting for bad commit, 1 good commit known
# bad: [f8a30de08d21d33597703fc9ce7d13e98b7c9886] libstdc++: [_GLIBCXX_DEBUG] Fix safe.base.h comments
git bisect bad f8a30de08d21d33597703fc9ce7d13e98b7c9886
# bad: [431068af077e13f0113f3640385b7b6cfa0a3e68] vect-patterns: Fix up vect_recog_popcount_clz_ctz_ffs_pattern for non-mode precision types [PR127149]
git bisect bad 431068af077e13f0113f3640385b7b6cfa0a3e68
# bad: [a42cd9bb068ac5f752c1361fa178a6f0727fdb66] Fixup recent gcc.dg/vect/bb-slp-pattern-2.c change
git bisect bad a42cd9bb068ac5f752c1361fa178a6f0727fdb66
# bad: [c8a9bc5cf5d788a3bc796341f8070d073076b91b] i386: Allow round for HFmode in optab hook [PR127114]
git bisect bad c8a9bc5cf5d788a3bc796341f8070d073076b91b
# bad: [8858cb3a6af52e4425d1635a7666d3f3658005d5] libbacktrace: handle MOREDATA correctly without debug info
git bisect bad 8858cb3a6af52e4425d1635a7666d3f3658005d5
# good: [19083e93272ab2482ff446cec8f7f688cb5afdc7] libbacktrace: use BACKTRACE_MOREDATA_VERSION rather than 3
git bisect good 19083e93272ab2482ff446cec8f7f688cb5afdc7
# first bad commit: [8858cb3a6af52e4425d1635a7666d3f3658005d5] libbacktrace: handle MOREDATA correctly without debug info
# first bad commit: [8858cb3a6af52e4425d1635a7666d3f3658005d5] libbacktrace: handle MOREDATA correctly without debug info