diff --git a/examples/ap_fixed/Makefile b/examples/ap_fixed/Makefile
index 016b7df..d4ca0e1 100644
--- a/examples/ap_fixed/Makefile
+++ b/examples/ap_fixed/Makefile
@@ -13,8 +13,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
+
+CXXFLAGS= -std=c++14 -Wall -O3
+
 a.out: test.cpp
-	g++ -I../../include test.cpp
+	g++ -I../../include $(CXXFLAGS) test.cpp
 	./a.out
 
 .PHONY: clean
diff --git a/examples/ap_int/Makefile b/examples/ap_int/Makefile
index 4ef871f..51d7cc0 100644
--- a/examples/ap_int/Makefile
+++ b/examples/ap_int/Makefile
@@ -15,22 +15,25 @@
 # limitations under the License.
 #
 
+CXXFLAGS= -std=c++14 -Wall -O3
+CXX=g++
+
 all: a.out ex1.out ex2.out ex3.out
 
 a.out: test.cpp
-	g++ -I../../include test.cpp -std=c++14 -o a.out
+	$(CXX) -I../../include test.cpp $(CXXFLAGS) -o a.out
 	./a.out
 
 ex1.out: ap_int_manip_ex.cpp
-	g++ -I../../include ap_int_manip_ex.cpp -std=c++14 -o ex1.out
+	$(CXX) -I../../include ap_int_manip_ex.cpp $(CXXFLAGS) -o ex1.out
 	./ex1.out
 
 ex2.out:  ap_int_manip_ex2.cpp
-	g++ -I../../include ap_int_manip_ex2.cpp -std=c++14 -o ex2.out
+	$(CXX) -I../../include ap_int_manip_ex2.cpp $(CXXFLAGS) -o ex2.out
 	./ex2.out
 
 ex3.out:  ap_int_manip_ex3.cpp
-	g++ -I../../include ap_int_manip_ex3.cpp -std=c++14 -o ex3.out
+	$(CXX) -I../../include ap_int_manip_ex3.cpp $(CXXFLAGS) -o ex3.out
 	./ex3.out
 
 .PHONY: clean
diff --git a/include/etc/ap_private.h b/include/etc/ap_private.h
index cfb9ac9..8385974 100644
--- a/include/etc/ap_private.h
+++ b/include/etc/ap_private.h
@@ -24,6 +24,14 @@
 #error "etc/ap_private.h cannot be included directly."
 #endif
 
+#if defined( __clang__ )
+#elif defined ( __GNUC__ )
+#pragma GCC diagnostic push 
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#pragma GCC diagnostic ignored "-Wint-in-bool-context"
+#pragma GCC diagnostic ignored "-Wuninitialized"
+#endif
+
 // forward declarations
 //template <int _AP_W, bool _AP_S, bool _AP_C = _AP_W <= 64>
 //class ap_private; // moved to ap_common.h
@@ -7202,6 +7210,11 @@ REF_BIN_OP(<<, arg1)
 //  when both sides are signed.
 //************************************************************************
 
+#if defined( __clang__ )
+#elif defined ( __GNUC__ )
+#pragma GCC diagnostic pop
+#endif
+
 #endif // ifndef __AP_PRIVATE_H__
 
 // -*- cpp -*-