conditional breakpoint with (char* ) string condition

[Fabio De Bona]

Hi everyone,
I would like to set a conditional breakpoint with a condition that 
depends on the value of
a char* string, i.e. something like

b gui/R.cpp:190 if cmd=="train" (doesn't work of course)

resp.

b gui/R.cpp:190 if strcmp(cmd,"train")

is there a possibility to do this *without* changing the code (like 
setting a boolean or so in the source).

Regards

Fabio