Allow multiple sanitizers to be enabled at the same time (#4538)

CMakeLists.txt

@@ -37,20 +37,23 @@ endif()
 
 if(PONY_USE_THREAD_SANITIZER)
     set(PONY_OUTPUT_SUFFIX "${PONY_OUTPUT_SUFFIX}-thread_sanitizer")
-    add_compile_options(-fsanitize=thread -DPONY_SANITIZER=\"thread\")
-    add_link_options(-fsanitize=thread -DPONY_SANITIZER=\"thread\")
+    list(APPEND PONY_SANITIZERS_ENABLED "thread")
 endif()
 
 if(PONY_USE_ADDRESS_SANITIZER)
     set(PONY_OUTPUT_SUFFIX "${PONY_OUTPUT_SUFFIX}-address_sanitizer")
-    add_compile_options(-fsanitize=address -DPONY_SANITIZER=\"address\")
-    add_link_options(-fsanitize=address -DPONY_SANITIZER=\"address\")
+    list(APPEND PONY_SANITIZERS_ENABLED "address")
 endif()
 
 if(PONY_USE_UNDEFINED_BEHAVIOR_SANITIZER)
     set(PONY_OUTPUT_SUFFIX "${PONY_OUTPUT_SUFFIX}-undefined_behavior_sanitizer")
-    add_compile_options(-fsanitize=undefined -DPONY_SANITIZER=\"undefined\")
-    add_link_options(-fsanitize=undefined -DPONY_SANITIZER=\"undefined\")
+    list(APPEND PONY_SANITIZERS_ENABLED "undefined")
+endif()
+
+if(PONY_SANITIZERS_ENABLED)
+    list(JOIN PONY_SANITIZERS_ENABLED "," PONY_SANITIZERS_VALUE)
+    add_compile_options(-fsanitize=${PONY_SANITIZERS_VALUE} -DPONY_SANITIZER=\"${PONY_SANITIZERS_VALUE}\")
+    add_link_options(-fsanitize=${PONY_SANITIZERS_VALUE} -DPONY_SANITIZER=\"${PONY_SANITIZERS_VALUE}\")
 endif()
 
 if(PONY_USE_COVERAGE)