On 1 July 2014 20:58, John David Anglin wrote: > On 1-Jul-14, at 5:32 AM, Jonathan Wakely wrote: > >> On 1 July 2014 09:40, Matthias Klose wrote: >>> >>> - HPPA (build log [2]), is missing all the future_base symbols and >>> exception_ptr13exception symbols, current_exception and >>> rethrow_exception. >> >> >> This implies ATOMIC_INT_LOCK_FREE <= 1 for that target. Our future and >> exception_ptr implementations rely on usable atomics. > > > ARM and HPPA use kernel assisted libraries for atomic support. Not exactly > lock free, but possibly good enough... > > Currently, c-cppbuiltin.c doesn't provide proper defines for this support. > We > currently define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4, etc, in > pa-linux.h. I'll experiment with defining ATOMIC_INT_LOCK_FREE there.
It should already be defined, but its value is what matters for libstdc++'s purposes. To be honest I'm not sure if we really need the value to be greater than one, if it's equal to one that might work. We'd need to check though.
