https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80753
Matthijs Kooijman <matthijs at stdin dot nl> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |matthijs at stdin dot nl --- Comment #3 from Matthijs Kooijman <matthijs at stdin dot nl> --- I also ran into this, this is still a problem in gcc 10.0.1. This is a particular problem in the Arduino environment, which relies on preprocessor error messages to automatically pick libraries to include. This bug prevents it from detecting that a particular library is needed and from adding it to the include path, breaking the build (that could have worked without this bug).