Add default CMAKE build type

CMakeLists.txt

@@ -8,14 +8,18 @@ set(CMAKE_CXX_FLAGS_MINSIZEREL     "-Os -DNDEBUG")
 set(CMAKE_CXX_FLAGS_RELEASE        "-O3 -DNDEBUG")
 set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O2 -g")
 
+if (NOT CMAKE_BUILD_TYPE)
+	set(CMAKE_BUILD_TYPE "Release")
+	message(WARNING "Build type unset using default")
+endif()
+message(STATUS "Using CMAKE_BUILD_TYPE: ${CMAKE_BUILD_TYPE}")
+
 set(CMAKE_AR      "/usr/bin/gcc-ar")
 set(CMAKE_LINKER  "/usr/bin/ld")
 set(CMAKE_NM      "/usr/bin/gcc-nm")
 set(CMAKE_OBJDUMP "/usr/bin/objdump")
 set(CMAKE_RANLIB  "/usr/bin/gcc-ranlib")
 
-set(CMAKE_BUILD_TYPE RELEASE)
-
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
 set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
 set(EXECUTABLE_OUTPUT_PATH ${CMAKE_BINARY_DIR}/bin)