cmake

make SDL build work on windows. It expects sdl to be unpacked into SDL2_DIR path. I unpack it into `deps\\SDL2`. for pleasure.
There is  a lot of things you have to do with cmake to make it work...

CMakeLists.txt

@@ -25,32 +25,50 @@ target_link_libraries(piexbasic PUBLIC piexcore)
 
 target_include_directories(piexbasic PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
 
+# headers from libraries, needed for build
+set(PIEX_EXTERNAL_HEADERS_DIR ${CMAKE_SOURCE_DIR}/deps/include)
 
+option(ENABLE_SDL "ENABLE_SDL" OFF)
 if(ENABLE_SDL)
+    message(STATUS "Building with SDL2")
     # static lib piexsdl
-    find_package(SDL2 REQUIRED)
+    find_package(SDL2 REQUIRED CONFIG COMPONENTS SDL2)
+
 
     file(GLOB_RECURSE PIEX_SDL_SOURCES impl_sdl/*.cpp)
     cmake_print_variables(PIEX_SDL_SOURCES)
 
     add_library(piexsdl STATIC ${PIEX_SDL_SOURCES})
 
-    target_link_libraries(piexsdl PUBLIC SDL2)
+    target_link_libraries(piexsdl PUBLIC SDL2::SDL2)
     target_link_libraries(piexsdl PUBLIC piexcore)
     target_include_directories(piexsdl PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
-    target_include_directories(piexsdl PRIVATE ${SDL2_INCLUDE_DIRS})
 
+    # workaround, because sdl release comes with paths like SDL2/include/SDL_shit.h
+    # and we can not use standard paths like SDL2/SDL_shit.h
+    file(GLOB PIEX_SDL2_HEADERS "${SDL2_INCLUDE_DIRS}/*.h")
+    file(COPY ${PIEX_SDL2_HEADERS} DESTINATION ${PIEX_EXTERNAL_HEADERS_DIR}/SDL2)
+    file(COPY ${SDL2_DIR} DESTINATION ${CMAKE_BINARY_DIR})
+    target_include_directories(piexsdl PUBLIC ${PIEX_EXTERNAL_HEADERS_DIR})
 
     # executable piexapp
     file(GLOB_RECURSE PIEXAPP_SOURCES app/*.cpp)
     cmake_print_variables(PIEXAPP_SOURCES)
 
     add_executable(piexapp ${PIEXAPP_SOURCES})
 
-    target_link_libraries(piexapp piexcore)
-    target_link_libraries(piexapp piexbasic)
-    target_link_libraries(piexapp piexsdl)
+    target_link_libraries(piexapp piexbasic piexsdl)
     target_include_directories(piexapp PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
+
+    if (WIN32)
+        # copy the .dll file to the same folder with executable
+        # needed for windows, if SDL is installed on custom path
+        add_custom_command(
+            TARGET piexapp POST_BUILD
+            COMMAND ${CMAKE_COMMAND} -E copy_if_different
+            $<TARGET_FILE:SDL2::SDL2>
+            $<TARGET_FILE_DIR:piexapp>)
+     endif()
 endif(ENABLE_SDL)
 
 add_subdirectory(tests)