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libs/lib1/CMakeLists.txt

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+# Defines a static library target named 'lib1' from its source file.
+add_library(lib1 STATIC src/lib1.c)
+
+# Specifies include directories that are part of lib1's public interface.
+# - PUBLIC: Means that targets linking to lib1 (like cmake_tutorialApp) will
+#           inherit this include path. This allows them to find lib1.h.
+# ${CMAKE_CURRENT_SOURCE_DIR} refers to the current directory where this CMakeLists.txt resides.
+target_include_directories(lib1 PUBLIC
+    ${CMAKE_CURRENT_SOURCE_DIR}/inc
+)
+
+# Links lib1 to lib2 and lib3.
+# - PRIVATE: Indicates that lib1's implementation depends on lib2 and lib3,
+#            but targets linking to lib1 do NOT need to know about lib2 or lib3.
+# CMake automatically propagates the PUBLIC/INTERFACE include directories from lib2 and lib3
+# to lib1, so explicit include directories for them are not needed here.
+target_link_libraries(lib1 PRIVATE lib2 lib3)