https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79069
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> --- And with r244350 ../configure --disable-bootstrap --enable-languages=c,c++,go,lto --with-long-double-128 --with-arch=z9-109 --with-tune=z10 reproduced too. Note that without --enable-checking=release, the error actually is: ../../../../libgo/go/runtime/trace.go: In function ‘runtime.dump.pN23_runtime.traceStackTable’: ../../../../libgo/go/runtime/trace.go:731:1: error: fallthru edge after unconditional jump in bb 2 func (tab *traceStackTable) dump() { ^ ../../../../libgo/go/runtime/trace.go:731:1: error: wrong number of branch edges after unconditional jump in bb 2 ../../../../libgo/go/runtime/trace.go:731:1: internal compiler error: verify_flow_info failed 0x802b7925 verify_flow_info() ../../gcc/cfghooks.c:260 0x80d329ed checking_verify_flow_info ../../gcc/cfghooks.h:198 0x80d329ed try_optimize_cfg ../../gcc/cfgcleanup.c:2988 0x80d330bf cleanup_cfg(int) ../../gcc/cfgcleanup.c:3152 0x80d33309 execute ../../gcc/cfgcleanup.c:3281 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <http://gcc.gnu.org/bugs.html> for instructions.