I would like to develop a library for use with my sketch. Ideally, I can link 'Arduino.h' as an external library in my IDE (CLion or Visual Studio C++) for code completion and builds. Any idea where I can find the .dll or .lib files associated with Arduino?
Welcome to the forum! There are different Arduino.h files for different cores. For example, my Arduino.h file for my Attiny core is found here: kgray/Library/Arduino/packages/ATTinyCore/hardware/avr/1.3.3/cores/tinymodern/Arduino.h
Looks like this is the Git repo for my core (ATMega328p for Arduino Uno): MiniCore/avr/cores/MCUdude_corefiles at master · MCUdude/MiniCore · GitHub.
To find the source code on my CPU I had to change ownership of the directory where Windows Store Apps are installed. Not sure there is a .dll or .lib file but I can include the directory where source files are found.