gcc warning\" 'will be initialized after'

Question

I am getting a lot of these warnings from 3rd party code that I cannot modify. Is there a way to disable this warning or at least disable it for certain areas (like #pragma push/pop in VC++)?

Example:

list.h:1122: warning: `list<LogOutput*, allocator<LogOutput*> >::node_alloc_' will be initialized after 
list.h:1117: warning:   `allocator<LogOutput*> list<LogOutput*, allocator<LogOutput*> >::alloc_'

Answer 1

Make sure the members appear in the initializer list in the same order as they appear in the class

Class C {
   int a;
   int b;
   C():b(1),a(2){} //warning, should be C():a(2),b(1)
}

or you can turn -Wno-reorder

Answer 2

You can disable it with -Wno-reorder.

Answer 3

For those using QT having this error, add this to .pro file

QMAKE_CXXFLAGS_WARN_ON += -Wno-reorder

Answer 4

use -Wno-reorder (man gcc is your friend :) )

Answer 5

If you're seeing errors from library headers and you're using GCC, then you can disable warnings by including the headers using -isystem instead of -I.

Similar features exist in clang.

If you're using CMake, you can specify SYSTEM for include_directories.

Answer 6

The order of initialization doesn’t matter. All fields are initialized in the order of their definition in their class/struct. But if the order in initialization list is different gcc/g++ generate this warning. Only change the initialization order to avoid this warning. But you can't define field using in initialization before its construct. It will be a runtime error. So you change the order of definition. Be careful and keep attention!