[CMake] Creating relocatable export files

[Alexander Neundorf]

On Saturday, November 14, 2015 12:19:11 Nicholas Braden wrote:
> Instead of using FOO_INCLUDE_DIR, I believe you should use
> target_include_directories() with the INTERFACE or PUBLIC options -
> this will export the include directories properly and they will be
> used when someone target_link_library()s your exported target.
> https://cmake.org/cmake/help/latest/command/target_include_directories.html?
> highlight=INTERFACE
> 
> There seems to be a section in the documentation on making sure your
> packages are relocatable:
> https://cmake.org/cmake/help/latest/manual/cmake-packages.7.html#creating-re
> locatable-packages
> 
> See also:
> https://cmake.org/cmake/help/latest/module/CMakePackageConfigHelpers.html

this is from before the fancy target-include-directories-propagation 
functionality was added, it shouldn't be necessary anymore.

Alex