[Bug libstdc++/65033] C++11 atomics: is_lock_free result does not always match the real lock-free property

[rth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65033

--- Comment #7 from Richard Henderson <rth at gcc dot gnu.org> ---
Author: rth
Date: Thu Mar 26 18:31:11 2015
New Revision: 221701

URL: https://gcc.gnu.org/viewcvs?rev=221701&root=gcc&view=rev
Log:
PR libstdc++/65033

 * include/bits/atomic_base.h (__atomic_base<T>::is_lock_free): Build
 a fake pointer indicating type alignment.
 (__atomic_base<T *>::is_lock_free): Likewise.
 * include/std/atomic (atomic<T>::is_lock_free): Likewise.

Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/bits/atomic_base.h
    trunk/libstdc++-v3/include/std/atomic