[cmake-developers] Using pkgconf

[Brad King]

On 06/14/2018 01:20 PM, Paul Fultz II wrote:
>> meta-packages that cover multiple components?
> 
> You can just create a .pc file that adds each component in the requires. 

That assumes that all components are wanted and are meant to be
all used together at once for linking.  CMake's find_package
command is meant to find what's available.  Project code then
links to some subset of the actual targets available.  Maybe
we'd need a variable-only .pc file with a specific naming
convention for that.

> find_package(zlib CONF VERSION > 1.0)

find_package already has a "CONFIG" mode.  The semantics of
pkgconf are different enough I don't think we should overload
the command.  I'd rather have a separate find_pkgconf command.
Or maybe another name will be appropriate depending on the
semantics designed.

-Brad