Re: [2.6 patch] add -Werror-implicit-function-declaration to CFLAGS

Andrew Morton
2005-11-11T02:28:15Z

Adrian Bunk <bunk@stusta.de> wrote:
>
> On Thu, Nov 10, 2005 at 04:28:57AM -0800, Andrew Morton wrote:
> > Adrian Bunk <bunk@stusta.de> wrote:
> > >
> > > Currently, using an undeclared function gives a compile warning, but it
> > > can lead to a nasty runtime error if the prototype of the function is
> > > different from what gcc guessed.
> > >
> > > With -Werror-implicit-function-declaration, we are getting an immediate
> > > compile error instead.
> > >
> > > There will be some compile errors in cases where compilation previously
> > > worked because the undefined function wasn't called due to gcc dead code
> > > elimination, but in these cases a proper fix doesnt harm.
> > >
> >
> > Sorry, I need to build allmodconfig kernels on wacky architectures (eg
> > ppc64) and this patch is killing me.
>
> Can you send me the list of compile errors so that I can work on fixing
> them?
>

No handily, sorry. Missing virt_to_bus() is the typical problem.

The cross-tools at http://developer.osdl.org/dev/plm/cross_compile/ are
quite simple to install.