Different compile flags for same file in different targets

Question

I would like to include a .cpp-file in two different targets (becoming two VS projects after running CMake). I would like to set different COMPILE_FLAGS for these projects.<

Answer 1

If you adhere to a one target per subdirectory philosophy, you could do the following using add_definitions to add your compile flags.

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# in ./CMakeLists.txt
add_subdirectory(project1)
add_subdirectory(project2)   

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# in ./project1/CMakeLists.txt:
add_definitions("flags1")
add_executable(project1 ../myfile.cpp)

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# in ./project2/CMakeLists.txt:
add_definitions("flags2")
add_executable(project2 ../myfile.cpp)

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add_definitions applies to all files compiled in this subdirectory and those under it. You can apply flags to specific files using the following:

set_source_files_properties(myfile.cpp PROPERTIES COMPILE_FLAGS "flags")