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

[Andrew Morton]

Adrian Bunk <bunk at stusta.de> wrote:
>
> > > > 
> > > > 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.
> >
> 
> But in this case -Werror-implicit-function-declaration doesn't create 
> new compile errors, it only moves compile errors from compile time to 
> link or depmod time - which is IMHO not a bad change.

It is a quite inconvenient change if you want to get full coverage with
`make allmodconfig'.

Maybe one can do `make -i' and then weed through the noise - I haven't
tried.

> If you really want to keep the status quo, you can still steal the 
> following from sparc64:
>   extern unsigned long virt_to_bus_not_defined_use_pci_map(volatile void *addr);
>   #define virt_to_bus virt_to_bus_not_defined_use_pci_map
>   extern unsigned long bus_to_virt_not_defined_use_pci_map(volatile void *addr);
>   #define bus_to_virt bus_to_virt_not_defined_use_pci_map

Maybe.  There were some other failures.