How do I assign an attribute to a function

[ballsystemlord]

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?



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