adding a DEBUG option in cmake to compile wth debug flags

CMakeLists.txt

@@ -3,6 +3,13 @@ project (uts-server)
 
 set(VERSION 0.1.0)
 
+option(DEBUG     "compile with debug symbol"    OFF)
+if(DEBUG)
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O0 -g")
+    set(CMAKE_BUILD_TYPE Debug)
+endif(DEBUG)
+
+
 add_custom_target(tag 
     git tag -a "${VERSION}" -m "version ${VERSION}" &&
     git push origin ${VERSION}