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My problem of compiling with multiple executables was due to the fact that I was including 2 or more main functions within add_library because the add_library takes from the file(GLOB ${PROJECT_NAME}_src.. part, and it had a regex that took 2 or more executables.

The solution is to put your executables in a folder that isn't grabbed by the file(GLOB ${PROJECT_NAME}_src.. part and when you declare executables using add_executable, make sure to include within target_link_libraries the ${PROJECT_NAME variable, which is usually all non-executable .cpp files in your package.