[CMake] how to deprecate a target?

[Robert Maynard]

I am not aware of a nice way to setup CMake to error out if a user
links to `foo` instead of `Foo::foo`.
On Fri, Jun 29, 2018 at 2:05 AM Bram de Greve <bram at cocamware.com> wrote:
>
> Hi all,
>
> Consider this situation.  I'm building a Foo packaged, to be used by a
> Bar project.
>
> Foo used to export its target as simply foo.
> Now it exports its target as Foo::foo.
>
> Bar contains this:
> add_library(bar ...)
> target_link_libraries(bar foo)
>
> This of course must now be:
> add_library(bar ...)
> target_link_libraries(bar Foo::foo)
>
> But if bar still links to the foo instead of Foo::foo, then CMake
> doesn't really complain.  foo doesn't exist, but configures and
> generates just fine.  Of course, you'll face strange build errors, from
> which it isn't immediately apparent what's causing this ...
>
> How can I make sure CMake will complain loudly when bar still links to foo?
>
> Thanks,
> Bram.
>
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