http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60689

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
when the object is bigger than the wordsize the generic __atomic_exchange gets
expanded incorrectly

$ g++11 aa.cc -DN=4 -m32
$ g++11 aa.cc -DN=5 -m32
aa.cc: In function ‘int main()’:
aa.cc:10:49: error: invalid conversion from ‘S*’ to ‘unsigned int’
[-fpermissive]
   __atomic_exchange(&a, &b, &c, __ATOMIC_SEQ_CST);
                                                 ^
aa.cc:10:49: error: invalid conversion from ‘int’ to ‘void*’ [-fpermissive]
aa.cc:10:49: error: too few arguments to function ‘void
__atomic_exchange(unsigned int, volatile void*, void*, void*, int)’
<built-in>: note: declared here
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/60689] Bogus error with atomic::exchange
Date: Thu, 27 Mar 2014 20:47:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id`689

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|                            |jakub at gcc dot gnu.org
           Assignee|unassigned at gcc dot gnu.org      |jakub at gcc dot gnu.org

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 32469
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id2469&actioníit
gcc49-pr60689.patch

Untested fix.  4.8 needs the same fix I think.
In any case, no idea where to put a test for this.  libstdc++-v3?  libatomic?
g++.dg and just make it compile test?