If you have a package with both package.xml and setup.py - if the package.xml has invalid syntax, then colcon build silently falls back to a regular python build type, without even printing a warning.
I would expect this to actually fail the build, as it's a pretty serious error condition with confusing side effects. Instead it's only logged as a debug.
# COLCON_LOG_LEVEL=debug colcon build --packages-select mypkg
...
[0.216s] DEBUG:colcon.colcon_core.package_identification:Failed to parse potential ROS package manifest in'src/mypkg': Error(s) in package 'src/mypkg/package.xml':
The manifest contains invalid XML:
mismatched tag: line 4, column 12
...
# echo $?
0
If you have a package with both
package.xmlandsetup.py- if thepackage.xmlhas invalid syntax, thencolcon buildsilently falls back to a regularpythonbuild type, without even printing a warning.I would expect this to actually fail the build, as it's a pretty serious error condition with confusing side effects. Instead it's only logged as a debug.