[Libreoffice] gbuild question

I'm working on converting soltools to gbuild but I've come across a 
problem. 
soltools/testhxx/makefile.mk echos the commandline to compile a 
cxx file to a temporary file and then runs it through a perl script.
What I need is a way to get the command line used to compile a file with 
out actually executing it. 
With dmake this seems to be accomplished with 
CAPTURE_COMMAND but I haven't been able to find equivalent funcionality in 
gbuild. A pointer would be appreciated.

Peter