• PUBLIC:
• The property is applied to the target itself and all targets that link to it.
• Use this for libraries whose headers and dependencies are part of the API.
• PRIVATE:
• The property is applied only to the target itself.
• Use this for libraries whose headers and dependencies are only needed internally.
• INTERFACE:
• The property is not applied to the target itself but to all targets that link to it.
• Use this for "header-only" libraries or settings (like compiler flags) that should propagate.

Key Points in the Structure:

1. external_lib/:

   • Represents a header-only library (INTERFACE) or pre-built library.
   • Contains my_external_lib.h

2. my_utils/:

   • Contains utility functions and headers.
   • Compiled into a static library with its own compile options.

3. my_math/:

   • Depends on my_utils for additional functionality (e.g., print_message).
   • Compiled into a static library.

4. app/:

   • The final executable (my_app) consuming all other libraries.
   • Uses headers and functionality from my_utils, my_math, and external_lib.

5. Top-Level CMakeLists.txt:

   • Orchestrates the build process and includes subdirectorie

   external_lib ↑ (includes PUBLIC, linking PRIVATE) my_utils ↑ (public dependency) my_math ↑ (public dependency) app