[CMake] Imported targets with additional dependencies

[Hauke Heibel]

I just received help on IRC.

The solution is to use an INTERFACE target and INTERFACE_LINK_LIBRARIES
(and NOT LINK_INTERFACE_LIBRARIES).

Hauke

On Wed Nov 19 2014 at 2:26:54 PM Hauke Heibel <hauke.heibel at gmail.com>
wrote:

> Hi,
>
> I would like to declare an imported target which uses a header only
> library and which has some further link dependencies. If need be, I can
> specify a use case for this.
>
> I thought I could simply declare this target as
>
> add_library(Foo::Foo UNKNOWN IMPORTED)
>
> and then configure its dependencies via the target property
> IMPORTED_LOCATION.
>
> This used to work in 3.0.2, since it allowed me to specify multiple
> libraries separated by a semicolon (see here http://pastebin.com/Y1SYJFHh)
> but int 3.1-rc2 this semicolon is escaped to/replace by %3B. I was told
> that happens since there should only ever be a single entity specified by
> "IMPORTED_LOCATION".
>
> So I got the suggestion to use LINK_INTERFACE_LIBRARIES instead. When
> linking against such a target via target_link_libraries(Bar Foo::Foo)
> without specifying the IMPORTED_LOCATION property, I get Foo::Foo-NOTFOUND
> in my linker dependencies.
>
> The thing is I cannot specify IMPORTED_LOCATION, since there is really
> none. I could use my first library dependency to fake one but that does not
> sound right.
>
> I also cannot define my imported library as an INTERFACE target because
> for these, LINK_INTERFACE_LIBRARIES is not supported.
>
> Is there any way to achieve the declaration of such a target in 3.1?
>
> Regards,
> Hauke
>
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