it seems the you are using the Build Plugin. I have the following issues, maybe you have a solution.
Build with errors
I use this build command to build kate:
cd ~/kde/build/frameworks/ktexteditor/ && ninja install && cd ~/kde/build/kde/applications/kate/ && ninja install
After build the Output slider always changes to "Parsed output" which contains nothing even if there are compiler errors or warnings. Is this normal? (Apparently not, see comments, TODO: file bug report)
To run Kate I press F4 to activate the Terminal and then I use the history to invoke
bash -c "cd /home/gregor/kde/build/kde/applications/kate ; source prefix.sh ; ./kate/kate --startanon"
How do you do it? Ideally, I would like to have one single shortcut for this action (an idea for this documented here: https://phabricator.kde.org/T10324).