Issue compiling

Hi
trying to re-compile with no change sketches that worked yesterday. It does not work and I get this message:

lto1: fatal error: bytecode stream generated with LTO version 3.0 instead of the expected 4.1

compilation terminated.

lto-wrapper: fatal error: ./opt/tools/avr-gcc/5.4.0-atmel3.6.1-arduino2/bin/avr-gcc returned 1 exit status

compilation terminated.

/home/ubuntu/opt/tools/avr-gcc/5.4.0-atmel3.6.1-arduino2/bin/…/lib/gcc/avr/5.4.0/…/…/…/…/avr/bin/ld: error: lto-wrapper failed

collect2: error: ld returned 1 exit status

exit status 1

Any idea what it means?
Phil

This is a temporary problem with the Arduino Web Editor, not your code. There are multiple other reports of this bug:

I recommend subscribing to those threads so that you'll be sure to get news of any progress in fixing it.

This is an Arduino Web Editor specific problem so the workaround is to use the regular Arduino IDE, which you can download for free from: http://www.arduino.cc/en/Main/Software

Hello, please follow topic Issue 2018-10-30: lto-wrapper error prevent compilations for further information and updates about this.

Thank you.