fatal error: headerB.h: No such file or directory
headerB.h is in a project local library and ignored unless lib_compat_mode = off
Project structure
.___MyProj
| |___src
| |___main.cpp
| |___lib
| |___libA
| |___headerA.h
| |___libB
| |___headerB.h
libA/headerA.h is included correctly
libB/headerB.h is not included without lib_compat_mode = off
If headerA.h is moved into /lib/libB, then fatal error: headerA.h No such file or directory
/lib/libB/headerA.h is not found even if it is now a completely empty file.
If headerB.h is moved into /lib/libA, neither headerA.h or headerB.h are now found.
headerB.h only contains the following code:
#pragma once
#undef ARDUINO
#if defined (ARDUINO)
#include "Arduino.h"
#endif
Even though ARDUINO is undefined (and wasn’t defined before the #undef anyway), commenting out #include "Arduino.h" resolves the issue and all files are now found and included with lib_compat_mode = soft.