ignore redundent interface build

Author: yswhynot

rtmbuild/cmake/rtmbuild.cmake

@@ -259,11 +259,18 @@ macro(rtmbuild_genbridge)
   if(NOT ${PROJECT_NAME}_autogen_interfaces)
     message(AUTHOR_WARNING "[rtmbuild_genbridge] - no interface is defined")
   endif()
+  list(APPEND interface_list "")
   foreach(_comp ${${PROJECT_NAME}_autogen_interfaces})
-    message("[rtmbuild_genbridge] - rtmbuild_add_executable : ${_comp}ROSBridgeComp")
-    rtmbuild_add_executable("${_comp}ROSBridgeComp" "src_gen/${_comp}ROSBridge.cpp" "src_gen/${_comp}ROSBridgeComp.cpp")
-    add_custom_target(RTMBUILD_${PROJECT_NAME}_${_comp}_genbridge DEPENDS src_gen/${_comp}ROSBridge.cpp src_gen/${_comp}ROSBridgeComp.cpp)
-    add_dependencies(RTMBUILD_${PROJECT_NAME}_genbridge RTMBUILD_${PROJECT_NAME}_${_comp}_genbridge)
+    list(FIND interface_list ${_comp} _index)
+    if(_index EQUAL -1)
+        message("[rtmbuild_genbridge] - rtmbuild_add_executable : ${_comp}ROSBridgeComp")
+        rtmbuild_add_executable("${_comp}ROSBridgeComp" "src_gen/${_comp}ROSBridge.cpp" "src_gen/${_comp}ROSBridgeComp.cpp")
+        add_custom_target(RTMBUILD_${PROJECT_NAME}_${_comp}_genbridge DEPENDS src_gen/${_comp}ROSBridge.cpp src_gen/${_comp}ROSBridgeComp.cpp)
+        add_dependencies(RTMBUILD_${PROJECT_NAME}_genbridge RTMBUILD_${PROJECT_NAME}_${_comp}_genbridge)
+        list(APPEND interface_list ${_comp})
+    else()
+        message("[rtmbuild_genbridge] ${_comp} already generated.") 
+    endif()
   endforeach(_comp)
 
   # TARGET