Eliminate build-time warning

Zefram · jkeenan · commit 9738738e1fdf · 2020-03-27T18:54:10.000-04:00
Compiling with gcc7, for example, generated a '-Woverflow' warning with text 'overflow in implicit constant conversion'. For: #17664
diff --git a/ext/Opcode/Opcode.pm b/ext/Opcode/Opcode.pm
@@ -6,7 +6,7 @@ use strict;
 
 our($VERSION, @ISA, @EXPORT_OK);
 
-$VERSION = "1.46";
+$VERSION = "1.47";
 
 use Carp;
 use Exporter ();
diff --git a/ext/Opcode/Opcode.xs b/ext/Opcode/Opcode.xs
@@ -360,7 +360,7 @@ CODE:
 	bitmap[len] = ~bitmap[len];
     /* take care of extra bits beyond PL_maxo in last byte	*/
     if (PL_maxo & 07)
-	bitmap[opset_len-1] &= ~(0xFF << (PL_maxo & 0x07));
+	bitmap[opset_len-1] &= ~(char)(0xFF << (PL_maxo & 0x07));
     }
     ST(0) = opset;
 

Original file line number	Diff line number	Diff line change
`@@ -360,7 +360,7 @@ CODE:`
`360`	`360`	`bitmap[len] = ~bitmap[len];`
`361`	`361`	`/* take care of extra bits beyond PL_maxo in last byte */`
`362`	`362`	`if (PL_maxo & 07)`
`363`		`- bitmap[opset_len-1] &= ~(0xFF << (PL_maxo & 0x07));`
	`363`	`+ bitmap[opset_len-1] &= ~(char)(0xFF << (PL_maxo & 0x07));`
`364`	`364`	`}`
`365`	`365`	`ST(0) = opset;`
`366`	`366`