warning: comparison with string literal results in unspecified behaviour

Russell Shaw rjshaw@netspace.net.au
Tue Jan 22 11:29:00 GMT 2008

Andrew Haley wrote:
> Russell Shaw wrote:
>> How do i disable that? My code explicitly compares string pointers.
> The best way is to intern all your strings.  String interning is a
> fairly common efficient technique and you can look it up in Google.

I've seen that in Xlib code. There's no reason to do it if you're
not storing strings on a remote host.

I store pointers to const strings in various objects and use them
much like magic numbers, so direct pointer comparisons are the ideal
thing to do.

This warning never happened on older gcc versions.

Infact, the warning is incorrect for this valid use.

It's just unnecessary nannying.

I've been using it in thousands of lines of code for 5 years.

More information about the Gcc-help mailing list