re PR libstdc++/24692 (Atomic builtins for v3)

2006-05-29  Paolo Carlini  <pcarlini@suse.de>

	PR libstdc++/24692
	* include/bits/atomicity.h (__exchange_and_add_multi,
	__atomic_add_multi): New, depending on _GLIBCXX_ATOMIC_BUILTINS,
	inline the atomic builtins.
	(__exchange_and_add_dispatch, __atomic_add_dispatch): Adjust.
	* configure.ac: Define _GLIBCXX_ATOMIC_BUILTINS when the atomic
	builtins are available.
	* configure: Regenerate.
	* config.h.in: Likewise.

From-SVN: r114215