CMake - add_executable called with incorrect number of arguments

Question

I am trying to organize a C++ project which starts to have a lot of files. I would like to create two executables which share some source file using Cmake. I have found an i

Answer 1

The error you get is because source list, passed to add_executable, is actually empty.

Correct way for collect sources in Common/ subdirectory is:

file(GLOB Common_sources "Common/*.cpp")

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In command file(GLOB) RELATIVE option doesn't specify search directory. Instead, it just tells CMake to generate relative paths instead of absolute:

If RELATIVE flag is specified, the results will be returned as relative paths to the given path.

Assuming

file(GLOB Common_sources "Common/*.cpp")
# gets: //Common/my_source.cpp

then (also note to absolute path in RELATIVE option)

file(GLOB Common_sources RELATIVE "${CMAKE_CURRENT_SOURCE_DIR}/Common" "Common/*.cpp")
# gets: my_source.cpp

and (when files are not under RELATIVE directory)

file(GLOB Common_sources RELATIVE "${CMAKE_CURRENT_SOURCE_DIR}/Mps" "Common/*.cpp")
# gets: ../Common/my_source.cpp