CMake: create the output dir before copying a DLL.

Otherwise, in case of SDL and GLFW, where we don't really know the DLL
name, it would create a file named `bin` instead of copying into a newly
created bin/ directory if it doesn't exist yet. That happens in case of
a static build, where there are no DLLs and thus
CMAKE_RUNTIME_OUTPUT_DIRECTORY gets never created.

src/Magnum/Audio/CMakeLists.txt

@@ -116,15 +116,14 @@ if(CMAKE_RUNTIME_OUTPUT_DIRECTORY AND CORRADE_TARGET_WINDOWS AND (OPENAL_DLL_DEB
     # named soft_oal.dll and needs to be renamed to OpenAL32.dll to work
     # correctly. Not the case with OpenAL Soft built by hand.
     if(OPENAL_DLL_DEBUG AND OPENAL_DLL_RELEASE)
-        add_custom_command(TARGET MagnumAudio POST_BUILD
-            COMMAND ${CMAKE_COMMAND} -E copy_if_different $<$<CONFIG:Debug>:${OPENAL_DLL_DEBUG}>$<$<NOT:$<CONFIG:Debug>>:${OPENAL_DLL_RELEASE}> ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/OpenAL32.dll)
+        set(openal_dll_input $<$<CONFIG:Debug>:${OPENAL_DLL_DEBUG}>$<$<NOT:$<CONFIG:Debug>>:${OPENAL_DLL_RELEASE}>)
     elseif(OPENAL_DLL_DEBUG)
-        add_custom_command(TARGET MagnumAudio POST_BUILD
-            COMMAND ${CMAKE_COMMAND} -E copy_if_different ${OPENAL_DLL_DEBUG} ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/OpenAL32.dll)
+        set(openal_dll_input ${OPENAL_DLL_DEBUG})
     else()
-        add_custom_command(TARGET MagnumAudio POST_BUILD
-            COMMAND ${CMAKE_COMMAND} -E copy_if_different ${OPENAL_DLL_RELEASE} ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/OpenAL32.dll)
+        set(openal_dll_input ${OPENAL_DLL_RELEASE})
     endif()
+    add_custom_command(TARGET MagnumAudio POST_BUILD
+        COMMAND ${CMAKE_COMMAND} -E copy_if_different ${openal_dll_input} ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/OpenAL32.dll)
 endif()
 
 # Magnum Audio target alias for superprojects

src/Magnum/Platform/CMakeLists.txt

@@ -272,15 +272,18 @@ if(WITH_GLFWAPPLICATION)
     # help people running the apps
     if(CMAKE_RUNTIME_OUTPUT_DIRECTORY AND CORRADE_TARGET_WINDOWS AND (GLFW_DLL_DEBUG OR GLFW_DLL_RELEASE))
         if(GLFW_DLL_DEBUG AND GLFW_DLL_RELEASE)
-            add_custom_command(TARGET MagnumGlfwApplication POST_BUILD
-                COMMAND ${CMAKE_COMMAND} -E copy_if_different $<$<CONFIG:Debug>:${GLFW_DLL_DEBUG}>$<$<NOT:$<CONFIG:Debug>>:${GLFW_DLL_RELEASE}> ${CMAKE_RUNTIME_OUTPUT_DIRECTORY})
+            set(glfw_dll_input $<$<CONFIG:Debug>:${GLFW_DLL_DEBUG}>$<$<NOT:$<CONFIG:Debug>>:${GLFW_DLL_RELEASE}>)
         elseif(GLFW_DLL_DEBUG)
-            add_custom_command(TARGET MagnumGlfwApplication POST_BUILD
-                COMMAND ${CMAKE_COMMAND} -E copy_if_different ${GLFW_DLL_DEBUG} ${CMAKE_RUNTIME_OUTPUT_DIRECTORY})
+            set(glfw_dll_input ${GLFW_DLL_DEBUG})
         else()
-            add_custom_command(TARGET MagnumGlfwApplication POST_BUILD
-                COMMAND ${CMAKE_COMMAND} -E copy_if_different ${GLFW_DLL_RELEASE} ${CMAKE_RUNTIME_OUTPUT_DIRECTORY})
+            set(glfw_dll_input ${GLFW_DLL_RELEASE})
         endif()
+        add_custom_command(TARGET MagnumGlfwApplication POST_BUILD
+            # The directory might not always exist before (e.g. if creating a
+            # static build) and copy_if_different would just name the file
+            # `bin` instead of creating such directory
+            COMMAND ${CMAKE_COMMAND} -E make_directory ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}
+            COMMAND ${CMAKE_COMMAND} -E copy_if_different ${glfw_dll_input} ${CMAKE_RUNTIME_OUTPUT_DIRECTORY})
     endif()
 
     # Magnum GlfwApplication target alias for superprojects
@@ -342,15 +345,18 @@ if(WITH_SDL2APPLICATION)
     # help people running the apps
     if(CMAKE_RUNTIME_OUTPUT_DIRECTORY AND CORRADE_TARGET_WINDOWS AND (SDL2_DLL_DEBUG OR SDL2_DLL_RELEASE))
         if(SDL2_DLL_DEBUG AND SDL2_DLL_RELEASE)
-            add_custom_command(TARGET MagnumSdl2Application POST_BUILD
-                COMMAND ${CMAKE_COMMAND} -E copy_if_different $<$<CONFIG:Debug>:${SDL2_DLL_DEBUG}>$<$<NOT:$<CONFIG:Debug>>,${SDL2_DLL_RELEASE}> ${CMAKE_RUNTIME_OUTPUT_DIRECTORY})
+            set(sdl2_dll_input $<$<CONFIG:Debug>:${SDL2_DLL_DEBUG}>$<$<NOT:$<CONFIG:Debug>>,${SDL2_DLL_RELEASE}>)
         elseif(SDL2_DLL_DEBUG)
-            add_custom_command(TARGET MagnumSdl2Application POST_BUILD
-                COMMAND ${CMAKE_COMMAND} -E copy_if_different ${SDL2_DLL_DEBUG} ${CMAKE_RUNTIME_OUTPUT_DIRECTORY})
+            set(sdl2_dll_input ${SDL2_DLL_DEBUG})
         else()
-            add_custom_command(TARGET MagnumSdl2Application POST_BUILD
-                COMMAND ${CMAKE_COMMAND} -E copy_if_different ${SDL2_DLL_RELEASE} ${CMAKE_RUNTIME_OUTPUT_DIRECTORY})
+            set(sdl2_dll_input ${SDL2_DLL_RELEASE})
         endif()
+        add_custom_command(TARGET MagnumSdl2Application POST_BUILD
+            # The directory might not always exist before (e.g. if creating a
+            # static build) and copy_if_different would just name the file
+            # `bin` instead of creating such directory
+            COMMAND ${CMAKE_COMMAND} -E make_directory ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}
+            COMMAND ${CMAKE_COMMAND} -E copy_if_different ${sdl2_dll_input} ${CMAKE_RUNTIME_OUTPUT_DIRECTORY})
     endif()
 
     # Magnum Sdl2Application target alias for superprojects