[CMake] target_link_libraries replacing fully-qualified library with -l<x>

[Brad King]

On 01/28/2015 03:12 PM, Chris Green wrote:
> target_link_libraries(<target> /X/Y/libtbb.so)
> 
> results in link.txt files containing -ltbb.

This happens when the library is in an implicit link directory,
or possibly when the library does not have an SONAME field set.

For the former case, use an imported target:

 http://www.cmake.org/cmake/help/v3.1/command/add_library.html#imported-libraries
 http://www.cmake.org/cmake/help/v3.1/manual/cmake-buildsystem.7.html#imported-targets

-Brad