Macro Debugging macro to display macros, displays if macro is undefined. This is not meant to be executed in anyway, just visual comparison

macro_dbg.h

#define COMBINE1(X,Y) X##_##Y 
#define COMBINE(X,Y) COMBINE1(X,Y)
#define QUOTE_EX(p, dummy)  #p
#define QUOTE(p) QUOTE_EX(p, dummy)

#define DefMacro(p) \
    class COMBINE(Dummy_##p, __COUNTER__){\
    void info(){\
    auto undefinedWhenTrue = #p == QUOTE(p); \
    auto value = QUOTE(p);\
    auto line = ## __LINE__;\
    auto file = ##__FILE__ ;\
    }\
    };

z_Example

#define Goo 32666
#define Goo2

DefMacro(Goo)
DefMacro(Goo2)
DefMacro(undefined)

Output:
class Dummy_Goo_0{ void info(){ auto undefinedWhenTrue = "Goo" == "32666"; auto value = "32666"; auto line =20; auto file ="Source.cpp" ; } };
class Dummy_Goo2_1{ void info(){ auto undefinedWhenTrue = "Goo2" == ""; auto value = ""; auto line =21; auto file ="Source.cpp" ; } };
class Dummy_undefined_2{ void info(){ auto undefinedWhenTrue = "undefined" == "undefined"; auto value = "undefined"; auto line =22; auto file ="Source.cpp" ; } };