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Gilles Gouaillardet cca3caa84f configury: enhance C11 detection
clang 5.0 on trusty is busted with respect to C11 atomics

This can be evidenced with the simple program below.
This test was added into OPAL_PROG_CC_C11_HELPER() and disable
C11 atomics if it fails.

_Atomic uint32_t a;
uint32_t b;
atomic_fetch_xor_explicit(&a, b, memory_order_relaxed);

Refs. open-mpi/ompi#6264

Signed-off-by: Gilles Gouaillardet <gilles@rist.or.jp>

(cherry picked from commit open-mpi/ompi@d1fadebc65)
2019-01-13 14:19:36 +09:00
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