Answer by jspcal for _GLIBCXX_ATOMIC_BUILTINS not defined in gcc 4.4.5

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