try extern "C"

com.ibm.wala.cast.test/harness-src/c/Makefile

@@ -25,4 +25,4 @@ $(CAST_TEST_BIN)$(LIBPREFIX)xlator_test.$(DLLEXT):	$(C_GENERATED)/smoke.o
 main:	$(CAST_TEST_BIN)/smoke_main
 
 $(CAST_TEST_BIN)/smoke_main:	$(TEST_JNI_BRIDGE_HEADER) smoke_main.cpp
-	$(CC) $(ALL_FLAGS) -Wl,-rpath -Wl,$(DOMO_AST_BIN) -L$(DOMO_AST_BIN) -lcast -o $@ smoke_main.cpp
+	$(CC) $(ALL_FLAGS) -Wl,-rpath -Wl,$(DOMO_AST_BIN) $(DOMO_AST_BIN)/$(LIBPREFIX)cast.$(DLLEXT) -o $@ smoke_main.cpp

com.ibm.wala.cast/source/c/include/launch.h

@@ -3,7 +3,15 @@
 
 #include "jni.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+	
 extern JNIEnv *launch(char *);
 extern void kill();
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif