[chore] fix error while compiling with -O3 (#7890)

be/CMakeLists.txt

@@ -347,6 +347,7 @@ if (COMPILER_GCC)
     # https://stackoverflow.com/questions/67584073/gcc-11-false-array-subscript-is-partly-outside-array-bounds-warning
     # https://stackoverflow.com/questions/69426070/gcc-11-order-of-arguments-triggers-false-positive-wstringop-overflow-is-this-bu
     set(CXX_COMMON_FLAGS "${CXX_COMMON_FLAGS} -Wno-array-bounds -Wno-stringop-overread")
+    add_compile_options(-Wno-stringop-overflow)
 endif ()
 
 if (COMPILER_CLANG)

be/src/vec/common/cow.h

@@ -147,9 +147,12 @@ protected:
             return *this;
         }
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
         intrusive_ptr(intrusive_ptr&& rhs) : t(rhs.t) {
             rhs.t = nullptr;
         }
+#pragma GCC diagnostic pop
 
         intrusive_ptr& operator=(intrusive_ptr&& rhs) {
             intrusive_ptr(static_cast<intrusive_ptr&&>(rhs)).swap(*this);