[ovs-git] [openvswitch/ovs] 07ece3: ovs-atomic: Prefer Clang intrinsics over <stdatomi...

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/openvswitch/ovs
  Commit: 07ece367fb5fe071fa75a426a3ce28e3b4ce04ba
      https://github.com/openvswitch/ovs/commit/07ece367fb5fe071fa75a426a3ce28e3b4ce04ba
  Author: Ben Pfaff <blp at nicira.com>
  Date:   2014-11-11 (Tue, 11 Nov 2014)

  Changed paths:
    M lib/ovs-atomic.h

  Log Message:
  -----------
  ovs-atomic: Prefer Clang intrinsics over <stdatomic.h>.

On my Debian "jessie" system, <stdatomic.h> provided by GCC 4.9 is busted
when Clang 3.5 tries to use it.  Even a trivial program like this:

    #include <stdatomic.h>

    void
    foo(void)
    {
   _Atomic(int) x;
   atomic_fetch_add(&x, 1);
}

yields:

     atomic.c:7:5: error: address argument to atomic operation must be a
  pointer to integer or pointer ('_Atomic(int) *' invalid)

The Clang-specific version of ovs-atomic.h stills works, though, so this
commit works around the problem.

Signed-off-by: Ben Pfaff <blp at nicira.com>
Acked-by: Jarno Rajahalme <jrajahalme at nicira.com>