Commit 1514b275 introduces the use of atomic_read_explicit for
once-only initializers. When using C11 atomics this becomes
atomic_load_explicit, and the first argument needs to be non-const --
with FreeBSD HEAD's in-tree clang 3.3 the build fails for me with:
In file included from lib/bfd.c:34:
./lib/ovs-thread.h:482:5: error: first argument to atomic operation must be a
pointer to non-const _Atomic type ('const atomic_bool *' (aka
'const _Atomic(bool) *') invalid)
atomic_read_explicit(&once->done, &done, memory_order_relaxed);
^ ~~~~~~~~~~~
One workaround is to sprinkle CONST_CASTs around, in ovs-thread.h and
lib/bfd. - e.g.:
--- a/lib/ovs-thread.h
+++ b/lib/ovs-thread.h
@@ -479,7 +479,8 @@ ovsthread_once_is_done__(const struct ovsthread_once *once)
{
bool done;
- atomic_read_explicit(&once->done, &done, memory_order_relaxed);
+ atomic_read_explicit(CONST_CAST(atomic_bool *, &once->done), &done,
+ memory_order_relaxed);
return done;
}
Ben, what do you think?
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