diff --git a/cmake/TaichiCXXFlags.cmake b/cmake/TaichiCXXFlags.cmake
index 902261e3762ba..4313270baca19 100644
--- a/cmake/TaichiCXXFlags.cmake
+++ b/cmake/TaichiCXXFlags.cmake
@@ -25,7 +25,11 @@ else()
     if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
         message("Clang compiler detected. Using std=c++17.")
         set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17 -fsized-deallocation")
+    elseif ("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU")
+        message("GNU compiler detected. Using std=c++17.")
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17 -fsized-deallocation -Wno-class-memaccess -Wno-comment -Wno-sign-compare")
     else()
+        message("Invalid compiler ${CMAKE_CXX_COMPILER_ID} detected.")
         message(FATAL_ERROR "clang and MSVC are the only supported compilers for Taichi compiler development. Consider using 'cmake -DCMAKE_CXX_COMPILER=clang' if you are on Linux")
     endif()
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall ")
diff --git a/taichi/util/action_recorder.h b/taichi/util/action_recorder.h
index f11d9522967d5..8de8f04ed7349 100644
--- a/taichi/util/action_recorder.h
+++ b/taichi/util/action_recorder.h
@@ -35,7 +35,7 @@ struct ActionArg {
   int64 val_int64;
   float64 val_float64;
 
-  enum argument_type { str, int64, float64 };
+  enum class argument_type { str, int64, float64 };
   argument_type type;
 };