[CMake] $<> expressions in include_directories command

[Daniel Pfeifer]

2011/7/13 Andreas Pokorny <andreas.pokorny at gmail.com>

> Hi,
>
> 2011/7/13 Daniel Pfeifer <purplekarrot at gmail.com>:
> > 2011/7/13 Andreas Pokorny <andreas.pokorny at gmail.com>
> >> [...]
> >> add_library(foo ....)
> >> target_include_paths(foo include/foo )
> >> target_include_targets(foo bar)
> >
> > target_include_targets would not even be required, target_link_libraries
> > could handle that. Whenever a target is linked to a library, it also
> should
> > use the appropriate include directories.
>
> So you mean relying on the status of the assembled "include_directories".
> Not sure if you want that behavior, since include_directories  just adds
> directories while descending the directory tree.
>

I meant relying on target_include_paths.


> >
> >> [...]
> >>
> >> The existing include_directories command could "call"
> >> target_include_paths(..) internally
> >> for all targets defined afterwards..
> >
> > This works iff there is a 1:1 relationship between targets and
> directories.
> > Boost also has components that provide multiple libraries. And it also
> has
> > (quite a lot) of header-only libraries, these are components that provide
> no
> > library target at all.
>
> I admit that a a no-op or dummy target is missing for header only
> libraries. But
> I do not get the part with the 1:1 relationship? Could you elaborate...
>

I misread what the include_directories command would do using your approach.
My bad. Forget about the 1:1 relationship.


> Nonetheless I believe that your approach allows interesting uses for
> other configuration problems.
>

Thanks!

cheers, Daniel
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