Same problem here, also on Windows 10. I was having no problems compiling u8glib v1.19.1 while it was referenced globally through Sketch>Import Library. However, I tried to move it into my marlin folder and after updating the includes I'm left with the following error message:
This might be why most of you aren't having an issue while Veesta is. I've tried compiling version 1.17, 1.18, and 1.18.1 with no change. I think what may have happened for Veesta is when he downgraded to 1.18.0 with arduino's library manager, it downloaded to his Documents>Arduino>libraries directory and was globally referenced (and worked where the local inclusion didn't). I submitted an issue on the github here: [github.com] so we'll see what happens. I'm just going to go back to global referencing for now.
fork/exec C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avr-gcc.exe: The filename or extension is too long. Error compiling for board Arduino/Genuino Mega or Mega 2560.
This might be why most of you aren't having an issue while Veesta is. I've tried compiling version 1.17, 1.18, and 1.18.1 with no change. I think what may have happened for Veesta is when he downgraded to 1.18.0 with arduino's library manager, it downloaded to his Documents>Arduino>libraries directory and was globally referenced (and worked where the local inclusion didn't). I submitted an issue on the github here: [github.com] so we'll see what happens. I'm just going to go back to global referencing for now.