[cfe-commits] patch: libcxxabi cxa_*_virtual and cxa_guard_* methods

[Howard Hinnant]

Question for clang developers:

Will these namespace-scope definitions ever generate a call to __cxa_guard_acquire?  I know this is forward looking concerning thread_local:

#include <stddef.h>

namespace
{

size_t next_id;
thread_local const size_t id = __sync_fetch_and_add(&next_id, 1) + 1;

}

My motivation is to generate a 56-bit non-zero thread id for use in the __cxa_guard_acquire implementation.  Thus if these call __cxa_guard_acquire, then I can't use them.

Thanks,
Howard