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dependenciesexportcmake

install EXPORT problem for library with dependencies

I try to build two libraries (say A and B) from one project. I use add_subdirectory cmake command in root cmake file. B depends on A.

When I try to add

INSTALL (TARGETS B EXPORT B
    PUBLIC_HEADER DESTINATION "include/B"
    LIBRARY DESTINATION "lib"
    ARCHIVE DESTINATION "lib")

INSTALL (EXPORT B DESTINATION "./")

CMake warns me about error in line with INSTALL (EXPORT .... It prints:

CMake Error: INSTALL (EXPORT "B" ...) includes target "B" which requires target "A" that is not in the export set.

Solution

  • The error-message already tells you that you are exporting only one project, while it depends on the other project. The easiest solution is to export both projects. If they are both build by the same CMakeLists.txt you can simply call

    install( TARGETS A B ... )

    If not, then you probably have a top-level CMakeLists.txt (where you use add_subdirectory). You can setup an install-target there, let's call it "MyInstall". And in your subdirs refer to this top-level install-target

    In your subdir...

    install( TARGETS A EXPORT MyInstall ... )

    similar for target B, and then you export "MyInstall" your top-level CMakeLists.txt:

    install( EXPORT MyInstall ... )