Brian Dessent wrote:
"Samuel J. Guido" wrote:
Is it possible with GCC to define an object-like macro within a
function-like macro, i.e. this is what I am trying to do...
#define MyMacro(a) \
#define a##Type 55
As far as I can tell ISO C99 forbids this, in §6.10.3.2.1 which says:
"Each # preprocessing token in the replacement list for a function-like
macro shall be followed by a parameter as the next preprocessing token
in the replacement list."
So "#define" in the replacement list would be illegal unless 'define'
was a parameter, in which case it would stringify it.
I don't think what you're trying to do is possible in general with gcc,
but I could be wrong. Maybe if you explain in more detail why you would
need such a thing, someone would be able to offer an alternative.
Brian
I was trying to do exactly this type of thing just last night! My
reason is I've got
a bunch of code that reads:
#ifdef FOO
debug("FOO\n");
#endif
It's printing to a debug file to help track down what options were
defined. This is
several hundred lines of code, and it's a bit ugly. It would be nice to
be able to
write "PRINT_MACRO(FOO)" and have it expand to the 3 lines above.
