ST-LINK_gdbserver, SWV and not understood -a argument

Trying to setup SWV for ST-LINK_gdbserver, it seems that the -a <cpu clock> is not understood:

> ./ST-LINK_gdbserver -cp /opt/st/stm32cubeide_1.0.2/plugins com.st.stm32cube.ide.mcu.externaltools.cubeprogrammer.linux64_1.0.0.201904021149/tools/bin/ -d -z 61235 -a 72000000 -b 32

PARSE ERROR: Argument: -a

            Couldn't find match for argument