Is it possible to include a library from another library using the Arduino IDE?

Question

I\'m trying to write an Arduino library (effectively a C++ class) which itself references another library I have installed in my Mac\'s ~/Documents/Arduino/libraries directo

Answer 1

Not recommended method: It is possible to add basically any external library code to Arduino IDE build by knifing boards.txt file. Headers in c/cpp flags and libraries in ld flags. This may be useful for library dev using external tools (cmake/QT creator for me today).

I modified /home/pekka/arduino-1.8.5/hardware/teensy/avr/boards.txt by adding "/coderoot" to gcc include path and E_OS_arduino define, modified lines below:

teensy36.build.flags.cpp=-fno-exceptions -felide-constructors -std=gnu++14 -Wno-error=narrowing -fno-rtti -I/coderoot -DE_OS_arduino

teensy36.build.flags.c=-I/coderoot -DE_OS_arduino