diff options
Diffstat (limited to 'gcc/tree-cfg.c')
| -rw-r--r-- | gcc/tree-cfg.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/gcc/tree-cfg.c b/gcc/tree-cfg.c index 92f3201..4fb4a83 100644 --- a/gcc/tree-cfg.c +++ b/gcc/tree-cfg.c @@ -1750,7 +1750,14 @@ group_case_labels_stmt (gswitch *stmt) /* Discard cases that have an unreachable destination block. */ if (EDGE_COUNT (base_bb->succs) == 0 - && gimple_seq_unreachable_p (bb_seq (base_bb))) + && gimple_seq_unreachable_p (bb_seq (base_bb)) + /* Don't optimize this if __builtin_unreachable () is the + implicitly added one by the C++ FE too early, before + -Wreturn-type can be diagnosed. We'll optimize it later + during switchconv pass or any other cfg cleanup. */ + && (gimple_in_ssa_p (cfun) + || (LOCATION_LOCUS (gimple_location (last_stmt (base_bb))) + != BUILTINS_LOCATION))) { edge base_edge = find_edge (gimple_bb (stmt), base_bb); if (base_edge != NULL) |