Re: [PATCH 40/46] x86/livepatch, lto: Disable live patching with gcc LTO

Martin Liška
2022-11-15T13:33:33Z

On 11/14/22 23:00, Josh Poimboeuf wrote:
> On Mon, Nov 14, 2022 at 12:28:09PM -0800, Andi Kleen wrote:
>> On Mon, Nov 14, 2022 at 11:07:42AM -0800, Josh Poimboeuf wrote:
>>> On Mon, Nov 14, 2022 at 12:43:38PM +0100, Jiri Slaby (SUSE) wrote:
>>>> From: Andi Kleen <andi@firstfloor.org>
>>>>
>>>> It is not supported by gcc 12 so far, so it causes compiler "sorry"
>>>> messages.
>>>
>>> What specifically is not supported by GCC 12?
>>
>> -fwhole-program and the live patching options are mutually exclusive.
>
> What live patching options are you referring to?
>

As mentioned in the reply to the next email, we speak about:
https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#index-flive-patching
option:

gcc -flto -flive-patching=inline-clone a.c
cc1: sorry, unimplemented: live patching is not supported with LTO

Cheers,
Martin