CMake: Populate list of required include directories for library targets

PUBLIC items will populate the INTERFACE_INCLUDE_DIRECTORIES property of
<target>. This property is a list of public include directories
requirements for a library.

Targets may populate this property to publish the include directories
required to compile against the headers for the target.

example/CMakeLists.txt

@@ -13,9 +13,7 @@ file(GLOB_RECURSE GAME_SOURCES "${CMAKE_CURRENT_SOURCE_DIR}/src/*.cpp")
 
 add_executable(${GAME} ${GAME_SOURCES})
 target_include_directories(${GAME} PRIVATE
-	"src"
-	"${CMAKE_SOURCE_DIR}/src"
-	"${CMAKE_SOURCE_DIR}/vendor/ruc/src")
+	"src")
 target_link_libraries(${GAME} ${ENGINE})
 
 target_precompile_headers(${GAME} REUSE_FROM ${ENGINE})
@@ -25,5 +23,5 @@ target_precompile_headers(${GAME} REUSE_FROM ${ENGINE})
 # Add 'make run' target
 add_custom_target(run
     COMMAND ${GAME}
-	WORKING_DIRECTORY ".."
-)
+	WORKING_DIRECTORY "..")
+add_dependencies(run ${ENGINE})

src/CMakeLists.txt

@@ -1,14 +1,12 @@
 file(GLOB_RECURSE ENGINE_SOURCES "${ENGINE}/*.cpp")
 
 add_library(${ENGINE} ${ENGINE_SOURCES})
-target_include_directories(${ENGINE} PRIVATE
+target_include_directories(${ENGINE} PUBLIC
 	"."
 	"../vendor/entt/src"
-	"../vendor/glad/include"
 	"../vendor/glfw/include"
 	"../vendor/glm"
 	"../vendor/json/include"
-	"../vendor/lua"
 	"../vendor/ruc/src"
 	"../vendor/sol2/include"
 	"../vendor/stb")

vendor/CMakeLists.txt

@@ -18,7 +18,7 @@ list(REMOVE_ITEM LUA "${CMAKE_CURRENT_SOURCE_DIR}/lua/lua/lua.c")    # Do not co
 set(ENGINE_SOURCES ${GLAD} ${LUA})
 
 add_library(${ENGINE}-dependencies ${ENGINE_SOURCES})
-target_include_directories(${ENGINE}-dependencies PRIVATE
+target_include_directories(${ENGINE}-dependencies PUBLIC
 	"glad/include"
 	"lua")
 target_link_libraries(${ENGINE}-dependencies glfw ruc)