[WnCC] Magic constant in gcc

[Kumar Ayush]

Dear Friends

I discovered this concept called magic constants in gcc. One of them, https://gcc.gnu.org/onlinedocs/gcc/Function-Names.html

allows you to print function details like this:

void func(args){

cout << __PRETTY_FUNCTION__;

}

would print func(args). It is not immediately obvious what is the use unless you delve into CPP coding where you extensively use templated functions.

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Regards
Kumar Ayush

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[Kunal Tyagi]

There are similar but technically different macros such as

__LINE__, __FILE__: useful for debugging, logging

__FUNCTION__: useful for debugging c bindings

__STDC_HOSTED__: ensuring code runs with correct capabilities, eg: embedded only

These are preprocessor macros in gcc (and clang but official documentation is patchy). __PRETTY_FUNCTION__ is a special variable.

If you are using dynamic analysis, clang provides __has_feature(xyz) which really helps for debugging special issues.

PS: if you can't modify the source code, the cpp demangling is not that complicated. Esp if you use demangler.com

Cheers

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[Kumar Ayush]

A small remark; I don't believe they are pre-processor macros. They are variables. 

Please check the last line of the page I linked in my original email.