[cmake-developers] Allow ALIAS of IMPORTED targets

[Tamás Kenéz]

Thank you, I was not aware of the EXPORT_NAME target property.
Tamas

On Tue, Sep 15, 2015 at 7:36 PM, Stephen Kelly <steveire at gmail.com> wrote:

> Tamás Kenéz wrote:
>
> >> For example, if an ALIAS can be IMPORTED, does it makes sense that it
> can
> > be
> >> exported with export() and install(EXPORT)?
> >
> > Yes: couple of months ago I was adding install(EXPORT) to an existing
> > CMakeList. The name of the library target which I had to export was not
> > correct as export target name but I was not able change the library
> target
> > name because of backward compatibility. Being able to export an alias
> > would have helped.
>
> I still think exporting should be a follow up to allowing IMPORTED ALIAS.
> Just too keep the branch and discussion as short as possible.
>
> Nevertheless, I think you wouldn't need ALIAS targets for your use-case.
> They are more than you need. You don't need the aliases anywhere except for
> exporting. So, we could design something which allows you to export
> aliases,
> but be completely separate from ALIAS targets.
>
> For example,
>
>  add_library(foo ${foo_SRCS})
>  set_target_property(foo EXPORT_NAMES foo foo_old_name)
>
>  ...
>
>  install(EXPORT ...)
>
> resulting in a generated file containing
>
>  add_library(foo IMPORTED)
>  ...
>
>  add_library(foo_old_name IMPORTED)
>  ...
>
> where each of the generated targets get the same target properties.
>
> Note that there is already an EXPORT_NAME target property
>
>  http://www.cmake.org/cmake/help/v3.3/prop_tgt/EXPORT_NAME.html
>
> but it is not a list, so the task would probably be to deprecate that one
> and add EXPORT_NAMES.
>
> I filed
>
>  http://public.kitware.com/Bug/view.php?id=15745
>
> Thanks,
>
> Steve.
>
>
>
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