Re: [patch 01/10] compiler: define __attribute_unused__

David Rientjes
2007-05-02T17:16:49Z

On Wed, 2 May 2007, Adrian Bunk wrote:

> If we don't want any warnings with CONFIG_PCI=n, CONFIG_SYSFS=n or
> CONFIG_PROC_FS=n, we'd have to annotate _many_ functions.
>
> If the lonterm goal is to compile the kernel with -Werror then we need
> -Wno-unused-function, not annotating individual functions.
>

That's only addressing part of the issue. What about automatic or static
external variables that are declared but may go unreferenced depending on
preprocessor macros? You need to annotate them with __attribute__
((unused)) to suppress compiler warnings. Globally disabling such
warnings would eventually cause unused code to go unnoticed.

David