Header files with prefix in CMake project

Question

I have set up a CMake project whose directory structure looks as follows:

src/
--CMakeLists.txt
--libA/
----CMakeLists.txt
----foo.h
----foo.cpp
--main/
----         


        

Answer 1

This is an old question but I was having exactly the same issue. I ended up getting around this by adding an export_headers() function that creates symbolic links to the headers within the binary:

function(export_headers TARGET HEADER_SOURCE_DIR HEADER_DEST_DIR)

    # Put all headers that are in the source directory into EXPORT_HEADERS variable
    file(GLOB_RECURSE EXPORT_HEADERS CONFIGURE_DEPENDS 
        RELATIVE "${HEADER_SOURCE_DIR}" 
        "${HEADER_SOURCE_DIR}/*.h"
    )

    # For each header that will be exported
    foreach(HEADER ${EXPORT_HEADERS})

        # Get the directory portion that needs to be created        
        get_filename_component(HEADER_DIRECTORY "${HEADER}" DIRECTORY)

        # Create the directory  
        add_custom_command(TARGET ${TARGET} POST_BUILD
            COMMAND ${CMAKE_COMMAND} -E make_directory "${HEADER_DEST_DIR}/${HEADER_DIRECTORY}"
        )

        if (MSVC)

            # Make a hard link to the file
            add_custom_command(TARGET ${TARGET} POST_BUILD
                COMMAND if not exist "${HEADER_DEST_DIR}/${HEADER}" \( mklink /h "${HEADER_DEST_DIR}/${HEADER}" "${HEADER_SOURCE_DIR}/${HEADER}" \) 
            )

        else()

            # Make a symbolic link to the file
            add_custom_command(TARGET ${TARGET} POST_BUILD
                COMMAND ln -sf "${HEADER_SOURCE_DIR}/${HEADER}" "${HEADER_DEST_DIR}/${HEADER}"
            )

        endif()


    endforeach(HEADER)

endfunction()

You would call this with something like:

add_library(libA STATIC ${LIBA_SOURCES}
export_headers(libA ${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_BINARY_DIR}/include/libA)
target_include_directories(libA INTERFACE ${CMAKE_CURRENT_BINARY_DIR}/include)

Then, if you link to libA, you will be able to #include .