How to deal with installing static library

[LecrisUT]

If we have a library foo that is built as a static library, then if you try to install it with install(EXPORT) then it fails unless all its dependencies are also installed, even when the target_link_libraries is PRIVATE. The same does not occur if foo is a shared library or an executable.

• Why does this occur?
  • Posibility: the symbols in libfoo.a contain only the ones that it built for itself and not that of the dependencies, so in order to consume libfoo.a you would need it to consume its dependencies as well?
    (Confirmed in: https://github.com/LecrisUT/cmake_install_static_issue)
• Should installation of static libraries be supported? How to install the dependencies as well?
• How to limit the installation of PRIVATE linked dependencies to not install header files, Config.cmake, etc.
• Investigate BUILD_LOCAL_INTERFACE:
  • https://discourse.cmake.org/t/cmake-error-install-export-projecttargets-includes-target-xxx-which-requires-target-yyy-that-is-not-in-any-export-set/7344/6?u=lecris