[CMake] Linking with an external project also built with CMake

[Tamás Kenéz]

1. There is a (semi-)automatic way: you can export the targets of
ExternalLib with install(EXPORT...) from its CMakeLists.txt. In the
simplest cases you can use the generated export file as a config module:

    install(TARGETS ... EXPORT externallib ...)
    install(EXPORT externallib FILE externallib-config.cmake ...)

Of course you also need to set the appropriate properties of the targets of
ExternalLib by using the target_* commands.

2. (Another option) If you build the ExternalLib in the same project, its
targets will be available in the main project.

On Thu, Sep 17, 2015 at 6:25 PM, Saad Khattak <saadrustam at gmail.com> wrote:

> Hello,
>
> I have a project *ExternalLib* that uses CMake to build its libraries. I
> then have my own project (separate from the external library) that needs to
> include ExternalLib's headers and link with its libraries. ExternalLib does
> not have a find_package module.
>
> Since ExternalLib is also built using CMake, is there no 'automatic' way
> to have CMake figure out where the source files and library files are
> (since CMake built them in the first place)? That is, I want to avoid
> writing a find_package module for ExternalLib and since I have to build it
> using CMake anyway, I was hoping there would be some way to automatically
> fill in the correct paths for the libraries and source file directories in
> MyProject which also uses CMake.
>
> Thanks,
> Saad
>
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