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I confirmed this (my code). Although msg artifact is generated, the new msg doesn't appear in rosmsg list. Used catkin_make.

I confirmed this (my code). , which modifies beginner_tutorial to add a new msg file "Num5.msg" in a sub folder). Although msg artifact is generated, the new msg doesn't appear in rosmsg list. Used catkin_make. I can, however, use the new message Num5.msg in my ROS program. E.g. rostopic pub Num5 beginner_tutorials/Num5 1 then subscribing to it can be done without problem.

More concrete commands and result:

roscd beginner_tutorials/msg
mkdir subfolder
(edit CMakeLists.txt to add subfolder to `add_message_files`)
echo "int64 num" > subfolder/Num2.msg
cd -
catkin_make
source devel/setup.bash

Then,

find ./devel -iname *Num2*    --> Generated.
rosmsg list|grep Num          --> Num2 not listed.
rostopic pub Num2 beginner_tutorials/Num2 1    --> Published.
rostopic echo /Num2    --> Printed as expected.

So maybe a specific issue with rosmsg list.

I confirmed this (my code, which modifies beginner_tutorial to add a new msg file "Num5.msg" in a sub folder). Although msg artifact is generated, the new msg doesn't appear in rosmsg list. Used catkin_make. I can, however, use the new message Num5.msg in my ROS program. E.g. rostopic pub Num5 beginner_tutorials/Num5 1 then subscribing to it can be done without problem.

More concrete commands and result:

roscd beginner_tutorials/msg
mkdir subfolder
(edit CMakeLists.txt to add subfolder to `add_message_files`)
echo "int64 num" > subfolder/Num2.msg
cd -
catkin_make
source devel/setup.bash

Then,

find ./devel -iname *Num2*    --> Generated.
rosmsg list|grep Num          --> Num2 not listed.
rostopic pub Num2 beginner_tutorials/Num2 1    --> Published.
rostopic echo /Num2    --> Printed as expected.

So maybe a specific issue with rosmsg list.

$ apt-cache policy ros-kinetic-catkin ros-kinetic-rosmsg   |grep Inst 
  Installed: 0.7.6-0xenial-20170217-212821-0800
  Installed: 1.12.7-0xenial-20170308-194441-0800