[CMake] Lib dependencies discovery

[Pascal Fleury]

Hi Cmake-experts :-)

I have another issue, that libtool solved by the *.la files. I would like to 
install my library with some information about what other libs need to be 
linked to it when being used in an app. For DLLs, this is trivial mostly, as 
it contains this information (Linux) or forced to have no unsolved symbols 
(Windows).

If distributing a static lib, there may be dependencies that the user should 
know. I would like to ship a little app-config that will tell the user (or a 
tool being used) which are these libs. 

So finally my question: what is a portable cmake construct to find out the 
result of the various LINK_LIBRARIES and TARGET_LINK_LIBRARIES and friends 
for a given target library?

--paf