How to deprecate a C pre-processor macro in GCC?

Question

I know how to use __attribute__((deprecated)) or [[deprecated]] to deprecate a function like this:

int old_fn() __attribute__ ((deprecated));
[[deprecated]] int old_fn2();

But how to deprecate a Macro like this:

#define OLD_MACRO 1

Answer 1

Nice, elegant solution, however depending on C99 being enabled (works with gcc 4.8.2 or later, not tested on earlier versions):

#define DEPRECATED_MACRO1 _Pragma ("GCC warning \"'DEPRECATED_MACRO1' macro is deprecated\"") 7
#define DEPRECATED_MACRO2(...) _Pragma ("GCC warning \"'DEPRECATED_MACRO2' macro is deprecated\"") printf(__VA_ARGS__)

int main(int argc, char*argv[])
{
    int n = DEPRECATED_MACRO1;
    DEPRECATED_MACRO2("%d\n", n);
    return 0;
}