[CMake] global variable vs propagation of include_directories

[Brad King]

Sowa, Bartlomiej (NSN - PL/Wroclaw) wrote:
> It would be ideal, to have a way to propagate and aggregate
> include_directories up the add_subdirectory hierarchy. Can you help me
> to find a way to do this?

You can use global properties as global variables.  See the
set_property()/get_property() commands.  You can also use the
PARENT_SCOPE option to the set() command.  Another option is to use
get_directory_property() in the parent directory to get a definition
from the child directory.  See the documentation of these commands.

-Brad