Improving handling of library dependencies

This way we don't look for the extension libraries unless we need them
for the project we're building.

Author: Twinklebear

CMakeLists.txt

@@ -23,12 +23,7 @@ elseif (${CMAKE_CXX_COMPILER_ID} STREQUAL "MSVC")
 endif()
 
 find_package(SDL2 REQUIRED)
-find_package(SDL2_image REQUIRED)
-find_package(SDL2_ttf REQUIRED)
-
 include_directories(${SDL2_INCLUDE_DIR})
-include_directories(${SDL2_IMAGE_INCLUDE_DIR})
-include_directories(${SDL2_TTF_INCLUDE_DIR})
 
 add_subdirectory(Lesson0)
 add_subdirectory(Lesson1)

Lesson3/CMakeLists.txt

@@ -1,4 +1,8 @@
 project(Lesson3)
+
+find_package(SDL2_image REQUIRED)
+include_directories(${SDL2_IMAGE_INCLUDE_DIR})
+
 add_executable(Lesson3 src/main.cpp)
 target_link_libraries(Lesson3 ${SDL2_LIBRARY} ${SDL2_IMAGE_LIBRARY})
 install(TARGETS Lesson3 RUNTIME DESTINATION ${BIN_DIR})

Lesson4/CMakeLists.txt

@@ -1,4 +1,8 @@
 project(Lesson4)
+
+find_package(SDL2_image REQUIRED)
+include_directories(${SDL2_IMAGE_INCLUDE_DIR})
+
 add_executable(Lesson4 src/main.cpp)
 target_link_libraries(Lesson4 ${SDL2_LIBRARY} ${SDL2_IMAGE_LIBRARY})
 install(TARGETS Lesson4 RUNTIME DESTINATION ${BIN_DIR})

Lesson5/CMakeLists.txt

@@ -1,4 +1,8 @@
 project(Lesson5)
+
+find_package(SDL2_image REQUIRED)
+include_directories(${SDL2_IMAGE_INCLUDE_DIR})
+
 add_executable(Lesson5 src/main.cpp)
 target_link_libraries(Lesson5 ${SDL2_LIBRARY} ${SDL2_IMAGE_LIBRARY})
 install(TARGETS Lesson5 RUNTIME DESTINATION ${BIN_DIR})

Lesson6/CMakeLists.txt

@@ -1,5 +1,9 @@
 project(Lesson6)
+
+find_package(SDL2_ttf REQUIRED)
+include_directories(${SDL2_TTF_INCLUDE_DIR})
+
 add_executable(Lesson6 src/main.cpp)
-target_link_libraries(Lesson6 ${SDL2_LIBRARY} ${SDL2_IMAGE_LIBRARY} ${SDL2_TTF_LIBRARY})
+target_link_libraries(Lesson6 ${SDL2_LIBRARY} ${SDL2_TTF_LIBRARY})
 install(TARGETS Lesson6 RUNTIME DESTINATION ${BIN_DIR})
 

Lesson6/src/main.cpp

@@ -1,7 +1,6 @@
 #include <string>
 #include <iostream>
 #include <SDL.h>
-#include <SDL_image.h>
 #include <SDL_ttf.h>
 #include "asset.h"