[CMake] Configuration retrieval for external tools

[Olzhas Rakhimov]

Hello,

I need an advice how to get 'project configurations' from CMake
for another tool to use (cppdep <https://github.com/rakhimov/cppdep> in
particular).

The issue is described there: https://github.com/rakhimov/cppdep/issues/17

The information needed for analysis:

1. The directory of 'internal project (s)' source files
(header/implementation)
2. Each 'internal' and 'external' project names
3. include search directories (to find headers and dependencies among
projects)

The best I could think of so far is to parse the CMakeCache.txt.
Is there a better way?

I'd appreciate feedback and references.

Thanks,
Olzhas
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