[petsc-dev] Configuring for atomics

[Jed Brown]

Lots of other compilers support GCC-style intrinsics like
__sync_bool_compare_and_swap() and similar, so we really can't be doing
this kind of logic in lockfree.c.

#if __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 1050
#define PetscAtomicCompareandSwap(ptr, oldval, newval)
(OSAtomicCompareAndSwapPtr(oldval,newval,ptr))
#elif defined(_MSC_VER)
#define PetscAtomicCompareandSwap(ptr, oldval, newval)
(InterlockedCompareExchange(ptr,newval,oldval))
#elif (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) >
40100
#define PetscAtomicCompareandSwap(ptr, oldval, newval)
(__sync_bool_compare_and_swap(ptr,oldval,newval))
#else
#  error No maping for PetscAtomicCompareandSwap
#endif


What does everyone else think about using Dave Goodell's Open Portable
Atomics (https://trac.mcs.anl.gov/projects/openpa/, used by MPICH2) instead
of maintaining our own suite of configuration tests?
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