When building O2 I get:
/home/alla/aliceO2/sw/SOURCES/O2/1.0.0/0/GPU/Common/GPUDefOpenCL12Templates.h:21:28: error: variadic macros not supported in OpenCL
/home/alla/aliceO2/sw/SOURCES/O2/1.0.0/0/GPU/Common/GPUDef.h:86:19: error: variadic macros not supported in OpenCL
and more like these ones
Ubuntu 19.04
clang version 8.0.0-3
nvidia-opencl-dev 10.1.105-0ubuntu1
nvidia-drive-390 390.116-0ubuntu1
commit 2775523642938bd286c60099a957e526c5c38938
full log https://cernbox.cern.ch/index.php/s/DeFgqNohswWYcWv