_GLIBCXX_ATOMIC_BUILTINS not defined in gcc 4.4.5

I have some code that I'm porting and I've tracked d开发者_如何学编程own the error to missing the macro _GLIBCXX_ATOMIC_BUILTINS

Do later versions of gcc not define this?

What's the proper way to get around this?

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In that version you will also want to check the atomic macros for some particular data type, so you could do:

#if defined(_GLIBCXX_ATOMIC_BUILTINS_4) && !defined(_GLIBCXX_ATOMIC_BUILTINS)
#define _GLIBCXX_ATOMIC_BUILTINS
#endif

or

#if defined(_GLIBCXX_ATOMIC_BUILTINS) || defined(_GLIBCXX_ATOMIC_BUILTINS_4)

The macros are:

/* Define if builtin atomic operations for bool are supported on this host. */
#undef _GLIBCXX_ATOMIC_BUILTINS_1

/* Define if builtin atomic operations for short are supported on this host. */
#undef _GLIBCXX_ATOMIC_BUILTINS_2

/* Define if builtin atomic operations for int are supported on this host. */
#undef _GLIBCXX_ATOMIC_BUILTINS_4

/* Define if builtin atomic operations for long long are supported on this
   host. */
#undef _GLIBCXX_ATOMIC_BUILTINS_8