add UNREACHABLE_RETURN

Not every compilers understand that rb_raise does not return.  When a
function does not end with a return statement, such compilers can issue
warnings.  We would better tell them about reachabilities.

1 files changed, 1 insertions, 0 deletions

diff --git a/signal.c b/signal.c
index d479ca90dc..daf0123d4f 100644
--- a/signal.c
+++ b/signal.c
@@ -274,6 +274,7 @@ signm2signo(VALUE *sig_ptr, int negative, int exit, int *prefix_ptr)
     }
     rb_raise(rb_eArgError, "unsupported signal `%.*s%"PRIsVALUE"'",
              prefix, signame_prefix, vsig);
+    UNREACHABLE_RETURN(0);
 }
 
 static const char*