[Bug libstdc++/65913] [5/6 Regression] Linking failure without -latomic

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65913

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Thu Sep 17 15:46:04 2015
New Revision: 227878

URL: https://gcc.gnu.org/viewcvs?rev=227878&root=gcc&view=rev
Log:
Handle alignment in __atomic_is_lock_free

gcc:

2015-09-17  Richard Henderson  <rth@redhat.com>

        PR libstdc++/65913
        * builtins.c (fold_builtin_atomic_always_lock_free): Handle fake
        pointers that encode the alignment of the object.

libstdc++-v3:

2015-09-17  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/65913
        * include/bits/atomic_base.h (__atomic_base<_TTp>::is_lock_free(),
        __atomic_base<_PTp*>::is_lock_free()): Call the built-in with the
        immediate pointer value, not a variable.
        * include/std/atomic (atomic<T>::is_lock_free()): Likewise.
        * testsuite/29_atomics/atomic/65913.cc: New.

Added:
    trunk/libstdc++-v3/testsuite/29_atomics/atomic/65913.cc
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/builtins.c
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/bits/atomic_base.h
    trunk/libstdc++-v3/include/std/atomic