Re: GCC warnings for unused global variables

[Nathan Sidwell <nathan at codesourcery dot com>]

Kean Johnston wrote:

> > Or even better, __attribute__((used)).  If he fails to do this,
> > then at some point GCC will stop emitting that variable to the
> > object file entirely, precisely because it isn't used.
>
> THAT would be blatantly wrong. It means the compiler assumes it
> knows more about how things may be used than the human who wrote
> them does. Just because the source module doesn't use a variable,
> *EVEN IF ITS MARKED static* does NOT mean it is unused by other
> things, for example, object file analysys tools like "what".
then is should be volatile
	static const volatile rcsid[] = "my file";

not that this helps dusty decks ...

nathan

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Nathan Sidwell    ::   http://www.codesourcery.com   ::     CodeSourcery LLC
         The voices in my head said this was stupid too
nathan@codesourcery.com : http://www.cs.bris.ac.uk/~nathan/ : nathan@acm.org