cmake: make bullet an imported target

cmake/modules/FindBullet.cmake

@@ -0,0 +1,17 @@
+# Override CMake's FindBullet module:
+# create an IMPORTED TARGET
+
+include("${CMAKE_ROOT}/Modules/FindBullet.cmake")
+
+if(BULLET_FOUND)
+  list(GET BULLET_LIBRARIES 0 BULLET_FIRST_LIBRARY)
+  set(BULLET_OTHER_LIBRARIES "${BULLET_LIBRARIES}")
+  list(REMOVE_AT BULLET_OTHER_LIBRARIES 0)
+  add_library(bullet::bullet UNKNOWN IMPORTED)
+  set_target_properties(bullet::bullet PROPERTIES
+    IMPORTED_LINK_INTERFACE_LANGUAGES "C;CXX"
+    IMPORTED_LOCATION "${BULLET_FIRST_LIBRARY}"
+    INTERFACE_LINK_LIBRARIES "${BULLET_OTHER_LIBRARIES}"
+    INTERFACE_INCLUDE_DIRECTORIES "${BULLET_INCLUDE_DIR}"
+    )
+endif()

rwengine/CMakeLists.txt

@@ -148,6 +148,7 @@ add_library(rwengine
 target_link_libraries(rwengine
     PUBLIC
         rwlib
+        bullet::bullet
         ffmpeg::ffmpeg
         glm::glm
     PRIVATE
@@ -157,7 +158,6 @@ target_link_libraries(rwengine
 target_include_directories(rwengine
     SYSTEM
     PUBLIC
-        ${BULLET_INCLUDE_DIR}
         ${OPENAL_INCLUDE_DIR}
     )
 

rwgame/CMakeLists.txt

@@ -49,7 +49,6 @@ target_include_directories(rwgame
     SYSTEM
     PRIVATE
         ${Boost_INCLUDE_DIRS}
-        ${BULLET_INCLUDE_DIR}
         ${OPENAL_INCLUDE_DIR}
     )
 
@@ -63,7 +62,6 @@ target_link_libraries(rwgame
         rwengine
         ${Boost_PROGRAM_OPTIONS_LIBRARY}
         ${OPENGL_LIBRARIES}
-        ${BULLET_LIBRARIES}
         SDL2::SDL2
     )
 

rwviewer/CMakeLists.txt

@@ -24,16 +24,11 @@ add_executable(rwviewer
     AnimationListWidget.cpp
     )
 
-target_include_directories(rwviewer
-    SYSTEM
-    PRIVATE
-        ${BULLET_INCLUDE_DIR}
-    )
-
 target_link_libraries(rwviewer
     rwengine
     ${OPENGL_LIBRARIES}
-    ${BULLET_LIBRARIES})
+    )
+
 qt5_use_modules(rwviewer Widgets OpenGL)
 
 install(TARGETS rwviewer RUNTIME DESTINATION "${BIN_DIR}")

tests/CMakeLists.txt

@@ -60,7 +60,6 @@ target_include_directories(run_tests
     SYSTEM
     PRIVATE
         ${Boost_INCLUDE_DIRS}
-        ${BULLET_INCLUDE_DIR}
     )
 
 target_include_directories(run_tests
@@ -73,7 +72,6 @@ target_link_libraries(run_tests
     PRIVATE
         rwengine
         ${OPENGL_LIBRARIES}
-        ${BULLET_LIBRARIES}
         SDL2::SDL2
         ${PNG_LIBRARIES}
         ${Boost_FILESYSTEM_LIBRARY}