Let's see with an example :  
```CMake
cmake_minimum_required(VERSION 3.5)
project(talker_c)

find_package(ament_cmake REQUIRED)
find_package(rclc REQUIRED)
find_package(std_msgs REQUIRED)

find_package(rosidl_typesupport_test REQUIRED)

install(
  FILES main.c
  DESTINATION ${PROJECT_NAME}
)

ament_package()
```

If I understand well, it's the `ament_package()` call that fills the variables, isn't it ?

As you can see, there is 4 dependencies (ament_cmake, rclc, std_msgs, rosidl_typesupport_test). How can I extract these 4 dependencies from a variable ? I want something like `${talker_c_DEPENDENCIES}` that gives me the list of dependencies of the project (extracted from the package.xml or anything) on which I could iterate with "foreach".

I don't want to get rid of the `find_package(...)` calls, I just want to be able to display the list just after `ament_package`.





---
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