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Re: HAS_CC_CET_IBT misdetected
- To: Olaf Hering <olaf@xxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 2 May 2023 13:01:01 +0100
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On 02/05/2023 12:33 pm, Olaf Hering wrote:
> Tue, 2 May 2023 09:31:56 +0200 Jan Beulich <jbeulich@xxxxxxxx>:
>
>> How does 2.37 vs 2.39 matter? CET-IBT support is present in gas as of 2.29.
> I have no idea. It turned out, the previous Leap image was based on 15.3,
> while the current one will be 15.4.
>
> If I run this manually, it appears the error is produced properly:
>
> gcc -Wall -fcf-protection=branch -mmanual-endbr
> -mindirect-branch=thunk-extern -c -x assembler -o /dev/null - ; echo $?
> gcc: error: unrecognized command line option ‘-fcf-protection=branch’; did
> you mean ‘-fno-protect-parens’?
> gcc: error: unrecognized command line option ‘-mmanual-endbr’
> 1
>
> An for some reason there is no failure with the refreshed image on gitlab:
>
> https://gitlab.com/xen-project/xen/-/jobs/4210269545/artifacts/external_file/build.log
>
> I will investigate why it failed to build for me.
CET-IBT is far more dependent on the compiler, than it is on binutils.
The minimum version of GCC necessary is 9, but if you've backported the
requisite options then an older GCC will work too.
~Andrew
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