Hi Tim,
the -fno-addrsig flag shouldn’t be needed any more, I think, I believe one of my colleagues fixed that issue in the compiler. As Rod recommended, the next thing is to get the actual device compilation log. I think the easiest way to do this is to use a configuration file:
echo "verbose_output=true" > computecpp.conf
COMPUTECPP_CONFIGURATION_FILE=computecpp.conf samples/reduction
should have more output on the command line hopefully showing us why it doesn’t run!