Re: [PATCH v5 02/16] x86: Raise minimum GCC version to 8.1

[Ard Biesheuvel]

On Tue, 5 Nov 2024 at 16:58, Brian Gerst <brgerst@xxxxxxxxx> wrote:
>
> Stack protector support on 64-bit currently requires that the percpu
> section is linked at absolute address 0 because older compilers fixed
> the location of the canary value relative to the GS segment base.
> GCC 8.1 introduced options to change where the canary value is located,
> allowing it to be configured as a standard percpu variable.  This has
> already been done for 32-bit.  Doing the same for 64-bit will enable
> removing the code needed to suport zero-based percpu.
>
> Signed-off-by: Brian Gerst <brgerst@xxxxxxxxx>
> ---
>  scripts/min-tool-version.sh | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/scripts/min-tool-version.sh b/scripts/min-tool-version.sh
> index 91c91201212c..06c4e410ecab 100755
> --- a/scripts/min-tool-version.sh
> +++ b/scripts/min-tool-version.sh
> @@ -19,6 +19,8 @@ binutils)
>  gcc)
>         if [ "$ARCH" = parisc64 ]; then
>                 echo 12.0.0
> +       elif [ "$SRCARCH" = x86 ]; then
> +               echo 8.1.0
>         else
>                 echo 5.1.0
>         fi

There appears to be consensus that we can bump this to GCC 8.1.0 for
all architectures:

https://lore.kernel.org/all/20240925150059.3955569-32-ardb+git@xxxxxxxxxx/