Use properly set debug and release build flags

Author: Twinklebear

CMakeLists.txt

@@ -7,7 +7,9 @@ set(BIN_DIR ${TwinklebearDevLessons_SOURCE_DIR}/bin)
 
 # Bump up warning levels appropriately for clang, gcc & msvc and build in debug mode
 if (${CMAKE_CXX_COMPILER_ID} STREQUAL "GNU" OR ${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang")
-	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -pedantic -ggdb -std=c++11")
+	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -pedantic -std=c++11")
+	set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS} -g")
+	set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS} -O2")
 elseif (${CMAKE_CXX_COMPILER_ID} STREQUAL "MSVC")
 	if (CMAKE_CXX_FLAGS MATCHES "/W[0-4]")
 		string(REGEX REPLACE "/W[0-4]" "/W4" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")