Returned -D_FORTIFY_SOURCE, building still fixed

source/CMakeLists.txt

@@ -67,13 +67,17 @@ add_custom_target(
     DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${GRESOURCE_C}
 )
 
-#set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pedantic -Wall -Wextra -Werror -Wmissing-declarations -fdiagnostics-color=always -std=c++2a")
-#set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pedantic -Wall -Wextra -Werror -Wmissing-declarations -fdiagnostics-color=always -lm")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pedantic -Wall -Wextra -Werror -Wmissing-declarations -fdiagnostics-color=always \
 	-O2 -pipe -fno-plt -fexceptions \
-        -Wformat -Werror=format-security \
+         -Wformat -Werror=format-security \
         -fstack-clash-protection -fcf-protection")
-      
+        
+string(FIND "${CMAKE_CXX_FLAGS}" "-D_FORTIFY_SOURCE" FORTIFY_FOUND)
+
+if(FORTIFY_FOUND EQUAL -1)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wp,-D_FORTIFY_SOURCE=2")
+endif()
+         
 set(SOURCE_FILES
         ubl-util-standard.h
         ubl-util-standard.c