[CMake] packaging configuration files

[Brad King]

James C. Sutherland wrote:
> Thanks.  To be clear, it only works if I use
> 
> 	set( ExprLib_LIBRARIES @TPL_LIBRARIES@ )
> 
> because otherwise I have no way of propagating the dependents of
> ExprLib downstream.  It is true that CMake will add the ExprLib
> library as a "target" that can be used internally in downstream
> projects, but the other third-party libraries that ExprLib
> requires can only be propagated "manually" - right?

In this example:

  # Library
  add_library(foo foo.c)
  target_link_libraries(foo m)
  install(TARGETS foo DESTINATION lib EXPORT FooLib)
  install(EXPORT FooLib DESTINATION lib/FooLib)

the FooLib.cmake file will provide the dependency on 'm'.
In an application:

  # App
  include(.../lib/FooLib/FooLib.cmake)
  add_executable(bar bar.c)
  target_link_libraries(bar foo)

The link line for 'bar' will contain

  -o bar ... /path/to/lib/libfoo.a -lm ...

-Brad