What is the difference between "${CMAKE_CURRENT_SOURCE_DIR}" and "." in INCLUDE_DIRECTORIES?

Question

Should I use

INCLUDE_DIRECTORIES(
    .
)

or

INCLUDE_DIRECTORIES(
    ${CMAKE_CURRENT_SOURCE_DIR}
)

What is the difference, if any? I've seen mostly "." in existing code, but searching for a dot on the Internet is kind of difficult ...

Answer 1

Both uses generate nearly the same output, since CMake tracks the current directory and replaces the occurrence of "." with "${CMAKE_CURRENT_SOURCE_DIR}/.". The only difference is that the "." variant has the extra path component "/." appended.

Whichever you choose is a matter of taste here.