Declare hints only if needed.

p4raw-id: //depot/perl@9741

diff --git a/ext/B/B/Deparse.pm b/ext/B/B/Deparse.pm
index 25db66a..7004975 100644 (file)
--- a/ext/B/B/Deparse.pm
+++ b/ext/B/B/Deparse.pm
@@ -995,7 +995,7 @@ sub declare_warnings {
 sub declare_hints {
     my ($from, $to) = @_;
     my $bits = $to;
-    return sprintf "BEGIN {\$^H &= ~0xFF; \$^H |= %x}\n", $bits;
+    return $bits ? (sprintf "BEGIN {\$^H &= ~0xFF; \$^H |= %x}\n", $bits) : '';
 }
 
 sub pp_dbstate { pp_nextstate(@_) }