The target no longer builds after the tool chain has been switched forth and back in the tool chain editor. The build fails with message
"No tool found that can build the extension specified with the build artifact name all"
The only way to get out is to add an new build configuration.
Steps to reproduce:
Create a project, add some files, build it.
Open Project Properties->C/C++ Build->Tool Chain Editor
Change the current tool chain to a different one, press apply
Then set the tool chain back to the original setting
Build the project -> Fails
GNU ARM C/C++ Development Support 0.5.3.201007072245 org.eclipse.cdt.cross.arm.gnu.feature.group
Eclipse IDE for C/C++ Developers 18.104.22.16800617-0520 epp.package.cpp