Al Viro wrote:
> On Tue, Jul 24, 2007 at 12:13:19PM -0700, Jeremy Fitzhardinge wrote:
>
>> Al Viro wrote:
>>
>>> Works here...
>>>
>>>
>> Hm, doesn't here:
>>
>> CC arch/i386/kernel/irq.o
>> /home/jeremy/hg/xen/paravirt/linux/arch/i386/kernel/irq.c: In function '__BUG':
>> include2/asm/bug.h:29: warning: 'noreturn' function does return
>>
>> This is with current FC7 distro gcc: gcc version 4.1.2 20070502 (Red Hat
>> 4.1.2-12)
>>
>
> Interesting... Looks like it's both version- and flags-dependent.
> Oh, well...
>
> BTW, alpha, frv, m68k and s390 have BUG() that is not recognized as
> noreturn by gcc.
>
Yes, it was something I added because I thought it would be useful.
Traditionally, BUG has not affected gcc's control flow analysis.
The other option is trying to use __builtin_trap, which happens to
generate ud2a on i386. But I don't think its necessarily guaranteed to
always do that, and I don't know if it does anything useful for other
architectures.
J
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