Creating a .so library that depends on message headers

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Hi,

I am trying to create a library that depends on header files generated by a call to generate_messages(). The message list is:

project(ros_otp22)

add_message_files( FILES hydraulic_arm.msg valve_command.msg valve_command_info.msg angular_rate_info.msg slope_info.msg accel_info.msg )

The library call is add_library(o22pac src/o22pac/o22pac.cpp). This sometimes works and sometimes doesn't depending on the exact order in which the message header files are generated.

What I need is a list variable that does into the add_library() call that lists the files. Using ${PROJECT_NAME}_generate_message_cpp (such as for add_dependencies()) does NOT work as it does not generate a list of header file names.

I could create my own list of headers, but that seems like a monumental waste of time an effort, source of bugs and misconfiguration and violation of the 'DRY' (don't repeat yourself) principle since catkin_make and cmake should already be aware of what headers the .msg files generate.

Is there a variable generated by catkin that represents a list of the header files by name? My searches of the documentation have found nothing promising.

Thanks, Bart