More warnings

diff --git a/Makefile b/Makefile
index cea7c763572c5dfabba1bf737a2cfd891c5f564b..892b3ebca0d8faaf908bfc6c295c2db3a9474035 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 CXX = g++
-CXXFLAGS = -std=gnu++11 -Wall -Wextra -pedantic -Werror -O2
+CXXFLAGS = -std=gnu++11 -Wall -Wextra -pedantic -Werror -O2 -Wstrict-overflow=2
 LFLAGS =
 
 SRCS = sliding_tile.cc sliding_tile_lib.cc