Modernize CMake (6): OpenAL (OPTIONAL_LIBS no longer used)

(Libraries that we include our own find-modules for)

CMakeLists.txt

@@ -3,7 +3,7 @@
 # Contains global options and definitions
 ##
 
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 3.13)
 
 project(colobot C CXX)
 
@@ -305,7 +305,6 @@ find_package(GLEW REQUIRED)
 
 if (OPENAL_SOUND)
     find_package(OpenAL REQUIRED)
-    include_directories(${OPENAL_INCLUDE_DIR})
     find_package(LibSndFile REQUIRED)
 endif()
 
@@ -360,7 +359,6 @@ endif()
 ##
 # Localename
 ##
-set(LOCALENAME_INCLUDE_DIR ${colobot_SOURCE_DIR}/lib/localename)
 add_subdirectory(lib/localename)
 
 
@@ -368,7 +366,6 @@ add_subdirectory(lib/localename)
 # Wingetopt
 ##
 if(WINGETOPT)
-    set(WINGETOPT_INCLUDE_DIR ${colobot_SOURCE_DIR}/lib/wingetopt/src)
     add_subdirectory(lib/wingetopt)
 endif()
 
@@ -455,8 +452,7 @@ if(TESTS)
 
     add_subdirectory(${GTEST_SRC_DIR} lib/gtest)
 
-    # Hippomocks library
+    add_subdirectory(lib/hippomocks)
-    set(HIPPOMOCKS_INCLUDE_DIR ${colobot_SOURCE_DIR}/lib/hippomocks)
 
     # Tests targets
     enable_testing()

cmake/FindGLEW.cmake

@@ -49,3 +49,7 @@ ELSE (GLEW_INCLUDE_PATH)
 ENDIF (GLEW_INCLUDE_PATH)
 
 MARK_AS_ADVANCED( GLEW_FOUND )
+
+add_library(GLEW::GLEW INTERFACE IMPORTED)
+target_include_directories(GLEW::GLEW SYSTEM INTERFACE ${GLEW_INCLUDE_DIR})
+target_link_libraries(GLEW::GLEW INTERFACE ${GLEW_LIBRARY})

cmake/FindLibSndFile.cmake

@@ -21,3 +21,7 @@ ELSE(LIBSNDFILE_FOUND)
 		MESSAGE(FATAL_ERROR "Could not find sndfile")
 	ENDIF(LibSndFile_FIND_REQUIRED)
 ENDIF (LIBSNDFILE_FOUND)
+
+add_library(libsndfile::libsndfile INTERFACE IMPORTED)
+target_include_directories(libsndfile::libsndfile SYSTEM INTERFACE ${LIBSNDFILE_INCLUDE_DIR})
+target_link_libraries(libsndfile::libsndfile INTERFACE ${LIBSNDFILE_LIBRARY})

cmake/FindPhysFS.cmake

@@ -34,3 +34,7 @@ ELSE (GLEW_INCLUDE_PATH)
 ENDIF (PHYSFS_INCLUDE_PATH)
 
 MARK_AS_ADVANCED( PHYSFS_FOUND )
+
+add_library(PhysFS::PhysFS INTERFACE IMPORTED)
+target_include_directories(PhysFS::PhysFS SYSTEM INTERFACE ${PHYSFS_INCLUDE_PATH})
+target_link_libraries(PhysFS::PhysFS INTERFACE ${PHYSFS_LIBRARY})

cmake/FindSDL2.cmake

@@ -161,3 +161,7 @@ ENDIF(SDL2_LIBRARY_TEMP)
 INCLUDE(FindPackageHandleStandardArgs)
 
 FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL2 REQUIRED_VARS SDL2_LIBRARY SDL2_INCLUDE_DIR)
+
+add_library(SDL2::SDL2 INTERFACE IMPORTED)
+target_include_directories(SDL2::SDL2 SYSTEM INTERFACE ${SDL2_INCLUDE_DIR})
+target_link_libraries(SDL2::SDL2 INTERFACE ${SDL2_LIBRARY})

cmake/FindSDL2_image.cmake

@@ -156,3 +156,6 @@ INCLUDE(FindPackageHandleStandardArgs)
 
 FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL2_IMAGE REQUIRED_VARS SDL2_IMAGE_LIBRARY SDL2_IMAGE_INCLUDE_DIR)
 
+add_library(SDL2_image::SDL2_image INTERFACE IMPORTED)
+target_include_directories(SDL2_image::SDL2_image SYSTEM INTERFACE ${SDL2_IMAGE_INCLUDE_DIR})
+target_link_libraries(SDL2_image::SDL2_image INTERFACE ${SDL2_IMAGE_LIBRARY})

cmake/FindSDL2_ttf.cmake

@@ -155,3 +155,6 @@ INCLUDE(FindPackageHandleStandardArgs)
 
 FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL2_TTF REQUIRED_VARS SDL2_TTF_LIBRARY SDL2_TTF_INCLUDE_DIR)
 
+add_library(SDL2_ttf::SDL2_ttf INTERFACE IMPORTED)
+target_include_directories(SDL2_ttf::SDL2_ttf SYSTEM INTERFACE ${SDL2_TTF_INCLUDE_DIR})
+target_link_libraries(SDL2_ttf::SDL2_ttf INTERFACE ${SDL2_TTF_LIBRARY})

lib/gtest/CMakeLists.txt

@@ -1,8 +1,11 @@
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 3.13)
-
-include_directories(. include)
-
-add_definitions(-DGTEST_HAS_TR1_TUPLE=0)
 
 # gtest-all.cc includes all other sources
 add_library(gtest STATIC src/gtest-all.cc)
+
+target_include_directories(gtest
+	PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}
+	PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+)
+
+target_compile_definitions(gtest PUBLIC GTEST_HAS_TR1_TUPLE=0)

lib/hippomocks/CMakeLists.txt

@@ -0,0 +1,4 @@
+cmake_minimum_required(VERSION 3.13)
+
+add_library(hippomocks INTERFACE)
+target_include_directories(hippomocks SYSTEM INTERFACE $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>)

lib/localename/CMakeLists.txt

@@ -1,3 +1,4 @@
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 3.13)
 
 add_library(localename STATIC localename.c)
+target_include_directories(localename PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>)

lib/wingetopt/CMakeLists.txt

@@ -1,5 +1,7 @@
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 3.13)
 
-include_directories(${CMAKE_CURRENT_SOURCE_DIR}/src)
+add_library(wingetopt STATIC src/getopt.c)
-add_library(wingetopt STATIC src/getopt.c src/getopt.h)
+target_include_directories(wingetopt
+	PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src>
+)
 

src/CMakeLists.txt

@@ -24,20 +24,6 @@ endif()
 add_subdirectory(graphics/opengl/shaders)
 
 
-# Optional libraries
-set(OPTIONAL_LIBS "")
-set(OPTIONAL_INCLUDES "")
-
-if(OPENAL_SOUND)
-    set(OPTIONAL_LIBS ${OPENAL_LIBRARY})
-    set(OPTIONAL_INCLUDES ${OPENAL_INCLUDE_DIR})
-endif()
-
-if(WINGETOPT)
-    set(OPTIONAL_LIBS ${OPTIONAL_LIBS} wingetopt)
-    set(OPTIONAL_INCLUDES ${OPTIONAL_INCLUDES} ${WINGETOPT_INCLUDE_DIR})
-endif()
-
 # Additional libraries per platform
 if(MXE) # MXE requires special treatment
     set(PLATFORM_LIBS ${MXE_LIBS})
@@ -590,26 +576,6 @@ set(MAIN_SOURCES
     ${RES_FILES}
 )
 
-# Libraries
-set(LIBS
-    CBot
-    localename
-    ${SDL2_LIBRARY}
-    ${SDL2_IMAGE_LIBRARY}
-    ${SDL2_TTF_LIBRARY}
-    ${OPENGL_LIBRARY}
-    ${PNG_LIBRARIES}
-    ${GLEW_LIBRARY}
-    ${Boost_LIBRARIES}
-    ${LIBSNDFILE_LIBRARY}
-    ${OPTIONAL_LIBS}
-    ${PLATFORM_LIBS}
-    ${PHYSFS_LIBRARY}
-)
-
-set(COLOBOT_LIBS ${LIBS} PARENT_SCOPE)
-
-
 # Includes
 set(LOCAL_INCLUDES
     ${CMAKE_CURRENT_SOURCE_DIR}
@@ -618,17 +584,7 @@ set(LOCAL_INCLUDES
 )
 
 set(SYSTEM_INCLUDES
-    ${SDL2_INCLUDE_DIR}
-    ${SDL2_IMAGE_INCLUDE_DIR}
-    ${SDL2_TTF_INCLUDE_DIR}
-    ${PNG_INCLUDE_DIRS}
-    ${GLEW_INCLUDE_PATH}
-    ${Boost_INCLUDE_DIRS}
-    ${LIBSNDFILE_INCLUDE_DIR}
-    ${LOCALENAME_INCLUDE_DIR}
-    ${PHYSFS_INCLUDE_PATH}
     ${LIBINTL_INCLUDE_PATH}
-    ${OPTIONAL_INCLUDES}
 )
 
 set(COLOBOT_LOCAL_INCLUDES ${LOCAL_INCLUDES} PARENT_SCOPE)
@@ -648,6 +604,37 @@ link_directories(
 
 add_library(colobotbase STATIC ${BASE_SOURCES})
 
+target_link_libraries(colobotbase PUBLIC
+    Boost::system Boost::regex Boost::filesystem
+    PNG::PNG
+    SDL2::SDL2 SDL2_image::SDL2_image SDL2_ttf::SDL2_ttf
+    GLEW::GLEW
+    PhysFS::PhysFS
+    libsndfile::libsndfile
+    localename
+
+    CBot
+
+    ${PLATFORM_LIBS}
+    ${OPENGL_LIBRARY}
+)
+
+if(OPENAL_SOUND)
+    # find_package(OpenAL) doesn't define a target for OpenAL, so we make our own one
+    add_library(OpenAL INTERFACE IMPORTED)
+    target_link_libraries(OpenAL INTERFACE ${OPENAL_LIBRARY})
+    target_include_directories(OpenAL INTERFACE ${OPENAL_INCLUDE_DIR})
+
+    target_link_libraries(colobotbase PUBLIC
+        OpenAL
+        libsndfile::libsndfile
+    )
+endif()
+
+if(WINGETOPT)
+    target_link_libraries(colobotbase PUBLIC wingetopt)
+endif()
+
 add_executable(colobot ${MAIN_SOURCES})
 target_link_libraries(colobot colobotbase ${LIBS})
 

test/unit/CMakeLists.txt

@@ -31,14 +31,11 @@ include_directories(
 
 include_directories(
     SYSTEM
-    ${GTEST_INCLUDE_DIR}
-    ${HIPPOMOCKS_INCLUDE_DIR}
     ${COLOBOT_SYSTEM_INCLUDES}
 )
 
 # Libraries
 set(LIBS
-    gtest
     colobotbase
     ${COLOBOT_LIBS}
 )
@@ -56,7 +53,7 @@ file(COPY ${TEST_FILES} DESTINATION ${CMAKE_RUNTIME_OUTPUT_DIRECTORY})
 add_definitions(-DGTEST_HAS_TR1_TUPLE=0)
 
 add_executable(colobot_ut ${UT_SOURCES})
-target_link_libraries(colobot_ut ${LIBS})
+target_link_libraries(colobot_ut ${LIBS} hippomocks gtest)
 
 add_test(
     NAME colobot_ut