netdev - Re: [PATCH] selftests/bpf: add LDFLAGS when building test

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Date:   Wed, 31 Mar 2021 12:02:42 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Jisheng Zhang <jszhang3@...l.ustc.edu.cn>
Cc:     Shuah Khan <shuah@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] selftests/bpf: add LDFLAGS when building test_verifier

On Mon, Mar 29, 2021 at 11:11 AM Jisheng Zhang
<jszhang3@...l.ustc.edu.cn> wrote:
>
> From: Jisheng Zhang <jszhang@...nel.org>
>
> This is useful for cross compile process to point linker to the
> correct libelf, libcap, libz path.

Is this enough to make cross-compilation of selftests/bpf work? I
think there was a discussion another day about cross-compiling
selftests/bpf, so I wonder if this is the only change that's needed to
make it work.

>
> Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
> ---
>  tools/testing/selftests/bpf/Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> index 044bfdcf5b74..dac1c5094e28 100644
> --- a/tools/testing/selftests/bpf/Makefile
> +++ b/tools/testing/selftests/bpf/Makefile
> @@ -447,7 +447,7 @@ verifier/tests.h: verifier/*.c
>                 ) > verifier/tests.h)
>  $(OUTPUT)/test_verifier: test_verifier.c verifier/tests.h $(BPFOBJ) | $(OUTPUT)
>         $(call msg,BINARY,,$@)
> -       $(Q)$(CC) $(CFLAGS) $(filter %.a %.o %.c,$^) $(LDLIBS) -o $@
> +       $(Q)$(CC) $(CFLAGS) $(LDFLAGS) $(filter %.a %.o %.c,$^) $(LDLIBS) -o $@
>
>  # Make sure we are able to include and link libbpf against c++.
>  $(OUTPUT)/test_cpp: test_cpp.cpp $(OUTPUT)/test_core_extern.skel.h $(BPFOBJ)
> --
> 2.31.0
>
>