CMake: update release-mixed-debug conditions

CMakeLists.txt

@@ -65,18 +65,19 @@ if(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
     endif()
 endif()
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fpermissive --std=c++17 -Wno-attributes -pipe -fvisibility=hidden -Wl,--no-undefined")
-#set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fpermissive") This is for the future versions
-#set(CMAKE_CXX_STANDARD 14) #Otherwise adds -std=gnu++11 and breaks successful building
-#set(CMAKE_CXX_STANDARD_REQUIRED ON)
-#set(CMAKE_CXX_EXTENSIONS OFF)
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fpermissive --std=c++17 -Wno-attributes -pipe -Wl,--no-undefined")
 
 set(LUA_LIBRARIES luajit)
 
 if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE "Release" CACHE STRING "" FORCE)
+endif()
+
+if(${CMAKE_BUILD_TYPE} STREQUAL "Release")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility=hidden")
 elseif(${CMAKE_BUILD_TYPE} STREQUAL "Debug")
-    add_definitions(-DDEBUG)
+    add_definitions(-DDEBUG -DMIXED)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Og")
     set(LUA_LIBRARIES luajit-debug)
 endif()