c++ - CMake compile project with multiple mains and shared functions -

let's suppose have 2 source files a , b. each 1 has main , public function.

a                 b |__ main()        |__ main() |__ foo()         |__ bar() 

i want bar method use foo function. how can compile in cmake project?

with configuration, b obviusly doesn't know a's foo function.

cmake_minimum_required(version 3.5) project(my_project)  set(cmake_cxx_flags "${cmake_cxx_flags} -std=c++14 -o3")  add_executable(a a.cpp) add_executable(b b.cpp) 

this configuration has obviusly both definitions of main.

cmake_minimum_required(version 3.5) project(my_project)  set(cmake_cxx_flags "${cmake_cxx_flags} -std=c++14 -o3")  set(source_files a.cpp) add_library(a_lib static ${source_files})  add_executable(a a.cpp) add_executable(b b.cpp)  target_link_libraries(b a_lib) 

is there way achieve want? i'd not combine both mains, or separate foo , a main in 2 different files. maybe using c++ headers?

split a 2 source files:

• one containing main function, , used a executable target not library.

• one containing foo function, used a_lib library target.

then use library a executable target too.

that's "best" solution imo.

you can use preprocessor macros conditionally compile main function in a.cpp. it's not recommend.