fix server app doesn't work with BAC_ROUTING (#783)

CMakeLists.txt

@@ -802,8 +802,12 @@ if(BACNET_STACK_BUILD_APPS)
   add_executable(error apps/error/main.c)
   target_link_libraries(error PRIVATE ${PROJECT_NAME})
 
-  # add_executable(gateway apps/gateway/main.c apps/gateway/gateway.h)
-  # target_link_libraries(gateway PRIVATE ${PROJECT_NAME})
+  add_executable(gateway apps/gateway/main.c apps/gateway/gateway.h)
+  target_link_libraries(gateway PRIVATE ${PROJECT_NAME})
+  target_compile_options(gateway PRIVATE
+    # Unreachable code because we have endless loop.
+    $<$<C_COMPILER_ID:MSVC>:/wd4702>
+  )
 
   add_executable(getevent apps/getevent/main.c)
   target_link_libraries(getevent PRIVATE ${PROJECT_NAME})
@@ -933,8 +937,20 @@ if(BACNET_STACK_BUILD_APPS)
   endif()
 
   if(BACDL_BIP AND BACDL_BIP6)
-    add_executable(router-ipv6 apps/router-ipv6/main.c)
-    target_link_libraries(router-ipv6 PRIVATE ${PROJECT_NAME})
+    add_executable(
+      router-ipv6
+      apps/router-ipv6/router-ipv6.h
+      apps/router-ipv6/main.c)
+    target_link_libraries(
+      router-ipv6
+      PRIVATE ${PROJECT_NAME})
+    target_compile_options(router-ipv6 PRIVATE
+      # These make this example not totally C90 compatible but it is ok.
+
+      -Wno-declaration-after-statement
+      -Wno-overlength-strings
+      -Wno-variadic-macros
+    )
   endif()
 
   add_executable(scov apps/scov/main.c)