Gcc error handling

[Philip Herron <herron dot philip at googlemail dot com>]

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Hey

This is just a basic question of the internal compliation.

So say you have a small program that prints like this:

char *mystr= "mystring";
printf("%s\n", mystr);

but if you were to have had

printf("%c\n",mystr);

gcc would throw up a compliation warning:

warning: format â%câ expects type âintâ, but argument 2 has type âchar *â

Just wondering what kind of gcc macro checks for that something like

printf(const char* fmt, ...)

is there a macro to go through the fmt and va_list of the different
types. But then its intereasting if you have something like:

  int x= 10000000000;
  printf("%i\n", x);

it will also warn me that x is too big to be an int. I guess its marco
trickery but maby it isnt a macro maby a gcc internal compilation for
the 2nd case because when running gdb on apps printf goes to a macro a
check i think cant remember.


Anyways i am not even sure if i have a question at the moment but any
guidance would be cool :)

- -Phil
http://redbrain.co.uk


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