Why don’t you try checking this link about the same error, “No source available…”. I think you’ll find this information useful.
No. That's not thre problem. In the poject settings I only see a "-s" flag (lower "s"), which wasn't enabled. And in the executables view
I also see the source files (assuming the libs under "Intel\iotdk-ide-win\devkit-x86\sysroots\i586-poky-linux" are the right ones for debugging)...
Wat else could be the problem?