netdev - Re: [PATCH bpf] samples/bpf: build with -D__TARGET_ARCH

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Date:   Mon, 15 Jul 2019 08:11:27 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Ilya Leoshkevich <iii@...ux.ibm.com>
Cc:     bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        gor@...ux.ibm.com, heiko.carstens@...ibm.com
Subject: Re: [PATCH bpf] samples/bpf: build with -D__TARGET_ARCH_$(SRCARCH)

On Mon, Jul 15, 2019 at 2:11 AM Ilya Leoshkevich <iii@...ux.ibm.com> wrote:
>
> While $ARCH can be relatively flexible (see Makefile and
> tools/scripts/Makefile.arch), $SRCARCH always corresponds to a directory
> name under arch/.
>
> Therefore, build samples with -D__TARGET_ARCH_$(SRCARCH), since that
> matches the expectations of bpf_helpers.h.
>
> Signed-off-by: Ilya Leoshkevich <iii@...ux.ibm.com>
> Acked-by: Vasily Gorbik <gor@...ux.ibm.com>
> ---

Acked-by: Andrii Nakryiko <andriin@...com>


>  samples/bpf/Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
> index f90daadfbc89..1d9be26b4edd 100644
> --- a/samples/bpf/Makefile
> +++ b/samples/bpf/Makefile
> @@ -284,7 +284,7 @@ $(obj)/%.o: $(src)/%.c
>         $(Q)$(CLANG) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(EXTRA_CFLAGS) -I$(obj) \
>                 -I$(srctree)/tools/testing/selftests/bpf/ \
>                 -D__KERNEL__ -D__BPF_TRACING__ -Wno-unused-value -Wno-pointer-sign \
> -               -D__TARGET_ARCH_$(ARCH) -Wno-compare-distinct-pointer-types \
> +               -D__TARGET_ARCH_$(SRCARCH) -Wno-compare-distinct-pointer-types \
>                 -Wno-gnu-variable-sized-type-not-at-end \
>                 -Wno-address-of-packed-member -Wno-tautological-compare \
>                 -Wno-unknown-warning-option $(CLANG_ARCH_ARGS) \
> --
> 2.21.0
>