Pass macros definition in g++ command line?

[Lim]

How to pass Macros definition to preprocessor with gcc
g++ -DMY_DEBUG is not working.
or
g++ -UDEBUG is not turning off DEBUG macros definition in programm. DEBUG is always DEFINED even if I do not put any macros definition in comand line.
How to undefined DEBUG macros for Release version?
I am compiling on SGI.

 

[Lim]

Ok, generally -DMY_DEBUG works.
I just can not undefine DEBUG it is always on.
I did not found any #define DEBUG in code
and even with -UDEBUG in my command line DEBUG is defined in code?
What can it be?

 

[Lim]

I have found. One 3rd party software has DEBUG definition in include file.