Macro Evaluation with print

How is it possible to use gdb to evaluate expressions which contain
macros?   I am using macros defined in a header file.  If I attach to
a process and attempt to print an expression containing the macro name
then I am told :
No symbol "my_symbol" in current context
I am presuming that the macro is replaced in the symbol table by its
definition, but surely there is some way of telling the compiler to
retain that
information?  I am inexperienced I may have missed something obvious.
Thanks,
Sean