On Fri, Nov 15, 2013 at 12:03 PM, ballsystemlord <doark@xxxxxxxx> wrote:
> I'm using C and I decided to read the whole gcc info manual on the subject.
> How do I apply an __attribute__ to the function as apposed to what it
> returns?
> Yes, I've read the docs and am looking for examples.
> I want to apply the cold __attribute__ to all the perror statements in my
> program, the perror function is declared in the GNU C library so how do I
> change it without effecting every other program that's compiled against the
> GNU C library?
In general, you can't.
In GCC 4.8 or later you can use the cold attribute on a label. Then
you can turn your calls to perror into a goto to that label.
Otherwise you can use __builtin_expect, as in
if (__builtin_expect (ok, true))
{
// Normal case.
}
else
perror ("error");
Ian
