c - why XLC compiler on bluegene/q doesn't support '-qtm'? -

i have problem xlc compiler on bluegene/q. version of xlc compiler 12.1:

ibm xl c/c++ blue gene, v12.1 version: 12.01.0000.0000 

according document1, should support compiler option "-qtm", used enable transactional memory. however, got following error message:

option -qtm not valid. enter xlc_r list of valid options. 

how can figure out? appreciated.

are invoking compiler bgxlc ?