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SubjectRe: [PATCH] powerpc: e500: Fix compilation with gcc e500 compiler
On Tuesday 24 May 2022 11:39:39 Pali Rohár wrote:
> gcc e500 compiler does not support -mcpu=powerpc option. When it is
> specified then gcc throws compile error:
>
> gcc: error: unrecognized argument in option ‘-mcpu=powerpc’
> gcc: note: valid arguments to ‘-mcpu=’ are: 8540 8548 native
>
> So do not set -mcpu=powerpc option when CONFIG_E500 is set. Correct option
> -mcpu=8540 for CONFIG_E500 is set few lines below in that Makefile.
>
> Signed-off-by: Pali Rohár <pali@kernel.org>
> Cc: stable@vger.kernel.org

Michael, do you have any objections about this patch?

> ---
> arch/powerpc/Makefile | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
> index eb541e730d3c..87f9f29ac9d2 100644
> --- a/arch/powerpc/Makefile
> +++ b/arch/powerpc/Makefile
> @@ -22,11 +22,16 @@ ifdef CONFIG_PPC32
> # or platform code sets later on the command line, but they are needed
> # to set a sane 32-bit cpu target for the 64-bit cross compiler which
> # may default to the wrong ISA.
> +# Never set -mcpu=powerpc option for gcc e500 compiler because this
> +# option is unsupported and throws error. The correct option for
> +# CONFIG_E500 is -mcpu=8540 and it is set few lines below.
> +ifndef CONFIG_E500
> KBUILD_CFLAGS += -mcpu=powerpc
> KBUILD_AFLAGS += -mcpu=powerpc
> endif
> endif
> endif
> +endif
>
> ifdef CONFIG_PPC_BOOK3S_32
> KBUILD_CFLAGS += -mcpu=powerpc
> --
> 2.20.1
>

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