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Re: HAS_CC_CET_IBT misdetected
- To: Olaf Hering <olaf@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 2 May 2023 09:34:34 +0200
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 02 May 2023 07:34:37 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 02.05.2023 09:31, Jan Beulich wrote:
> On 02.05.2023 07:48, Olaf Hering wrote:
>> The next push to xen.git#staging will trigger a build failure in the
>> refreshed Leap docker image.
>>
>> For some reason HAS_CC_CET_IBT will evaluate to true. I think the
>> significant change is the binutils upgrade from 2.37 to 2.39 in November
>> 2022.
>>
>> The comment indicates the combination of gcc7 and binutils 2.39 is supposed
>> to evaluate HAS_CC_CET_IBT to false.
>
> How does 2.37 vs 2.39 matter? CET-IBT support is present in gas as of 2.29.
> IOW I think it all ought to be tied to gcc being 7.x when 9.x is the
> supposed minimum. Did you / could you check which of the three options
> (-fcf-protection=branch -mmanual-endbr -mindirect-branch=thunk-extern)
> is/are possibly recognized by the (likely also updated) gcc7 there? That
> may provide a hint at what's going wrong ...
Oh, it might further be relevant that Kconfig's cc-option passes -E to the
compiler, yet none of the options actually affect pre-processing (and hence
might not tried to be evaluated with -E).
Jan
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