suppress a "integer overflow in expression" waring on big endian. Closes 4405

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/include/bb_archive.h b/include/bb_archive.h
index 9e176d335..d1a9a34ec 100644
--- a/include/bb_archive.h
+++ b/include/bb_archive.h
@@ -12,9 +12,10 @@ enum {
         /* .xz signature: 0xfd, '7', 'z', 'X', 'Z', 0x00 */
         /* More info at: http://tukaani.org/xz/xz-file-format.txt */
         XZ_MAGIC1   = 256 * 0xfd + '7',
-        XZ_MAGIC2   = 256 * (256 * (256 * 'z' + 'X') + 'Z') + 0,
+        XZ_MAGIC2   = 256 * (unsigned)(256 * (256 * 'z' + 'X') + 'Z') + 0,
         /* Different form: 32 bits, then 16 bits: */
-        XZ_MAGIC1a  = 256 * (256 * (256 * 0xfd + '7') + 'z') + 'X',
+        /* (unsigned) cast suppresses "integer overflow in expression" warning */
+        XZ_MAGIC1a  = 256 * (unsigned)(256 * (256 * 0xfd + '7') + 'z') + 'X',
         XZ_MAGIC2a  = 256 * 'Z' + 0,
 #else
         COMPRESS_MAGIC = 0x9d1f,