[PATCH] powerpc: Suppress 'executable stack' warning at link

[Tom Rini]

On Fri, Mar 24, 2023 at 02:10:35PM +0100, Christophe Leroy wrote:

> Following warning is observed at link.
> 
>   powerpc-linux-ld.bfd: warning: arch/powerpc/lib/reloc.o: missing .note.GNU-stack section implies executable stack
>   powerpc-linux-ld.bfd: NOTE: This behaviour is deprecated and will be removed in a future version of the linker
> 
> Add -zexecstack to KBUILD_LDFLAGS in order to suppress this warning.
> 
> Reported-by: Stephane Franjou <stephane.franjou at csgroup.eu>
> Signed-off-by: Christophe Leroy <christophe.leroy at csgroup.eu>

This has been addressed in -next with:
commit 57450d8661b3ec2e6b6f1d938e59f426cafb06d2
Author: Tom Rini <trini at konsulko.com>
Date:   Tue Feb 14 15:09:31 2023 -0500

    Makefile: Link with -z noexectack
    
    When moving to gcc-12.2 we started trying to quiet some of the new
    linker warnings, that are not relevant to us. However, a
    misunderstanding of the mechanics at play meant that I intentionally
    omitted passing -z noexecstack to the linker, when we do need to. Add
    this flag and in turn remove warnings from the linker.
    
    Fixes: 1e1c51f8ace8 ("Makefile: link with --no-warn-rwx-segments")
    Signed-off-by: Tom Rini <trini at konsulko.com>
    Reviewed-by: Simon Glass <sjg at chromium.org>

I didn't put this in master as (as far as I know) we're merely telling
the toolchain we're being intentional, and not changing the behavior.

-- 
Tom
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