Peter Scheibel d22cf1aed1 1. raise an exception if the multithreaded and singlethreaded options are both ... disabled 2. invoke the b2 installation once for each enabled threading option (apparently the install fails if a single call has both options enabled for mpi)		2016-01-15 18:07:41 -08:00
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spack	1. raise an exception if the multithreaded and singlethreaded options are both	2016-01-15 18:07:41 -08:00