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I ran into a strange problem were the compiler could not find a header file that I knew existed.

The problem was I created a class called ArduinoEvent and put it in ArduinoEvent.hpp, but when I tried to include it in a client file, the compiler complained that the file did not exist.

In file included from sketch/NetworkConnection.hpp:4:0,
                 from /home/john/development/arduino/esp_pump_monitor/app.ino:4:
sketch/MyEvent.h:5:28: fatal error: ArduinoEvent.hpp: No such file or directory
 #include "ArduinoEvent.hpp"
                            ^

After realizing that the compiler copies the files into another directory, I took a look and found that it had copied the ArduinoEvent.hpp file to ArduinoEvent.hpp.cpp. Since all the other files were copied fine, I simply renamed the file to BrduinoEvent.hpp and then everything was fine.

After searching I could not find anything that would imply that I could not name a class / file ArduinoBlah, so I was going to open an issue, but wanted to see if this restriction was documented somewhere and I just could not find it.

Update

I originally assumed the problem was due to the file being called ArduinoXxxx, but I hit this again with another file. I think the issue is related to the files being in the "top" folder. I noticed the process copies the xxx.ino files to xxx.ino.cpp, so I think that's what is happening and somehow it thinks various files are .ino files while they are not. As a workaround I moved all my class files to a lib folder and include them from there #include "./lib/xxx.hpp" for example. This seems to be working.

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  • 1
    A partial answer may be found at: github.com/arduino/Arduino/wiki/Build-Process Commented Jan 1, 2018 at 15:04
  • Try renaming *.hpp → *.h. Commented Jan 1, 2018 at 16:39
  • same thing happens, but if I use the name .cpp or even include an empty .cpp file it seems ok Commented Jan 1, 2018 at 18:05

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