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Subject: Re: [PATCH] powerpc/vdso32: Drop -mabi=elfv1 for 32 bit objects
To: Joel Stanley <joel@jms.id.au>, linuxppc-dev@lists.ozlabs.org
References: <20190110014258.20963-1-joel@jms.id.au>
From: Christophe Leroy <christophe.leroy@c-s.fr>
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Date: Thu, 10 Jan 2019 08:10:43 +0100
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Cc: Nick Desaulniers <ndesaulniers@google.com>, Daniel Axtens <dja@axtens.net>
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Le 10/01/2019 à 02:42, Joel Stanley a écrit :
> From: Daniel Axtens <dja@axtens.net>
> 
> All 64-bit objects need to specify the flag to be compiled correctly, we
> just don't need it for 32-bit objects. GCC just ignored it, but clang
> doesn't.
> 
> Link: https://github.com/ClangBuiltLinux/linux/issues/240
> Signed-off-by: Daniel Axtens <dja@axtens.net>
> Signed-off-by: Joel Stanley <joel@jms.id.au>
> ---
>   arch/powerpc/kernel/vdso32/Makefile | 14 ++++++++++++++
>   1 file changed, 14 insertions(+)
> 
> diff --git a/arch/powerpc/kernel/vdso32/Makefile b/arch/powerpc/kernel/vdso32/Makefile
> index 50112d4473bb..6bd41756e0c7 100644
> --- a/arch/powerpc/kernel/vdso32/Makefile
> +++ b/arch/powerpc/kernel/vdso32/Makefile
> @@ -34,6 +34,20 @@ obj-y += vdso32_wrapper.o
>   extra-y += vdso32.lds
>   CPPFLAGS_vdso32.lds += -P -C -Upowerpc
>   
> +# clang refuses to accept -mabi=elfv1 for when using the
> +# 64-bit target in 32-bit mode
> +ifdef CONFIG_CC_IS_CLANG

If -mabi=elfv1 is unneeded even for GCC, why depend on CLANG ?

> +ifdef CONFIG_PPC64
> +AFLAGS_REMOVE_getcpu.o += -mabi=elfv1
> +endif

Why only this one is inside the ifdef ? powerpc Makefile only set 
-mabi=elfv1 when CONFIG_PPC64 is set, so all objects should be handled 
the same way.

And would it harm just doing it all the time, regardless of CONFIG_PPC64 ?

Christophe

> +AFLAGS_REMOVE_sigtramp.o += -mabi=elfv1
> +AFLAGS_REMOVE_gettimeofday.o += -mabi=elfv1
> +AFLAGS_REMOVE_datapage.o += -mabi=elfv1
> +AFLAGS_REMOVE_cacheflush.o += -mabi=elfv1
> +AFLAGS_REMOVE_note.o += -mabi=elfv1
> +endif
> +
> +
>   # Force dependency (incbin is bad)
>   $(obj)/vdso32_wrapper.o : $(obj)/vdso32.so
>   
>