Nathan, I see a lot of [for once valid] complains from clang regarding the last UGNI related commit. More precisely the MCA_BTL_ATOMIC_SUPPORTS_FLOAT value is too large with respect to the fact that ISO C restricts a enum to int.
Can we pack the enums ? George. ../../../../../ompi/opal/mca/btl/btl.h:326:5: warning: ISO C restricts enumerator values to range of 'int' (2147483648 is too large) [-Wpedantic] MCA_BTL_ATOMIC_SUPPORTS_FLOAT = 0x80000000,