On Tuesday 15 October 2013, Johannes Zarl wrote:
> Hi,
>
> I'd like to make some code in my build system dependent on the existance of
> a target. Basically I'd like to write something like this:
>
> if(TARGET optional_lib)
> add_library(bar ${bar_srcs})
> target_link_library(bar optional_lib)
> endif()
>
> The problem I have is that for a couple of reasons the CMakelists file for
> bar needs to be read before optional_lib. Therefore the "TARGET
> optional_lib" test fails even though I can link bar successfully against
> optional_lib.
Can generator expressions maybe be used for that ?
They are evaluated at generate time, so at a time when the target is know to
exist or not.
Alex
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