Reduce disk space used by ROS 2 build.

[danzimmerman]

Running out of space on a 32GB card.

See also:

• Required disk space to build ROS 2 from source?  ros2/ros2#1635
• Provide a 'clean' verb colcon/colcon-core#37

Questions:

• - Does --merge-install have any effect?
• - Is there a way to incrementally remove build artifacts post-install?
• - What about debug info, etc.?

[danzimmerman]

https://github.com/colcon/colcon-clean
https://gist.github.com/ruffsl/b2b567995810c69866221f659d52e71e
https://github.com/ruffsl/colcon-cache

[danzimmerman]

https://robotics.stackexchange.com/questions/107854/how-to-strip-down-the-install-directory-of-a-ros2-package

[danzimmerman]

RelWithDebInfo still seems right https://stackoverflow.com/questions/48754619/what-are-cmake-build-type-debug-release-relwithdebinfo-and-minsizerel

Can set specific flags this way (or change what you get for Release) https://discourse.cmake.org/t/setting-compiler-flags-in-cmakelists-txt/8820/2

https://stackoverflow.com/a/8422964
https://gcc.gnu.org/onlinedocs/gcc/Debugging-Options.html#Debugging-Options

-g

Produce debugging information in the operating system’s native format (stabs, COFF, XCOFF, or DWARF). GDB can work with this debugging information.

On most systems that use stabs format, -g enables use of extra debugging information that only GDB can use; this extra information makes debugging work better in GDB but probably makes other debuggers crash or refuse to read the program. If you want to control for certain whether to generate the extra information, use -gvms (see below).

[danzimmerman]

Building in release mode, now dying on rmw_cyclonedds_cpp:

Starting >>> rmw_cyclonedds_cpp
--- stderr: rmw_cyclonedds_cpp
/home/<user>/.local/opt/ros/jazzy_ws/src/ros2/rmw_cyclonedds/rmw_cyclonedds_cpp/src/rmw_node.cpp:5646:33: error: stray ‘\221’ in program
 5646 |   ret = rmw_validate_namespace(n<91>:<d2>"<U+0011><94>Q<9b>$<a6><U+000C><86>
      |                                 ^~~~
/home/<user>/.local/opt/ros/jazzy_ws/src/ros2/rmw_cyclonedds/rmw_cyclonedds_cpp/src/rmw_node.cpp:5646:35: error: stray ‘\322’ in program
 5646 |   ret = rmw_validate_namespace(n<91>:<d2>"<U+0011><94>Q<9b>$<a6><U+000C><86>
      |                                      ^~~~
/home/<user>/.local/opt/ros/jazzy_ws/src/ros2/rmw_cyclonedds/rmw_cyclonedds_cpp/src/rmw_node.cpp:5646:36: warning: missing terminating " character
---
Failed   <<< rmw_cyclonedds_cpp [3.58s, exited with code 2]

[danzimmerman]

I skipped that but eventually build died with I/O error on almost every command and wouldn't reboot.