Running under strace:

open("/tmp/OCL1Dtk0m.log", O_RDONLY|O_LARGEFILE) = 3
_llseek(3, 0, [19367], SEEK_END)        = 0
_llseek(3, 0, [19367], SEEK_CUR)        = 0
_llseek(3, 0, [0 ], SEEK_SET)            = 0
read(3, "/tmp/OCL1Dtk0m.cl(107): error: b"..., 19367) = 19367


Looks like the OpenCL compilation log contained more descriptive error. Maybe output that error when compilation fails?