Ian Lance Taylor-3 wrote
>>On Fri, Nov 15, 2013 at 12:03 PM, ballsystemlord <
> doark@
> > 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
>>
Ok, Thanks.
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