Hello, When I try to use a header, #ifdef doesn’t work properly, the code inside is gray out, if I call de function, I get an error. the identifier "blink" is not defined. If I remove #ifdef, I get a new error when I try to compile, undefined reference to 'blink()'. My headers are in include fold…

Where did you place the cpp-files corresponding to the header-files? [image] drakopd: My headers are in include folder I assume that you have placed them in include: If your project looks like that: include -> header.h header.cpp src -> main.cpp /home/hst/.platformio/packages/toolchai…

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Use headers give me an error

drakopd June 11, 2020, 8:17am 7

Thanks, the problem was the location of .cpp files. Now its work.

Compiler failed to find function definitions for header with adjacent source (undefined reference)