Use the -Wshift-overflow=2 compiler option if available.

[Gerald Pfeifer]

By now, most of my patches to address cases of potential shift 
overflow have been applied, and I have been submitting the rest.

Signed-off-by: Gerald Pfeifer <gerald at pfeifer.com>
---
 configure.ac | 1 +
 1 file changed, 1 insertion(+)

diff --git a/configure.ac b/configure.ac
index bfcf319..3575a31 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1828,6 +1828,7 @@ then
   WINE_TRY_CFLAGS([-Wdeclaration-after-statement])
   WINE_TRY_CFLAGS([-Wempty-body])
   WINE_TRY_CFLAGS([-Wignored-qualifiers])
+  WINE_TRY_CFLAGS([-Wshift-overflow=2])
   WINE_TRY_CFLAGS([-Wstrict-prototypes])
   WINE_TRY_CFLAGS([-Wtype-limits])
   WINE_TRY_CFLAGS([-Wunused-but-set-parameter])
-- 
2.6.1