netdev - Re: [PATCH bpf-next 1/3] selftests/bpf: Fix broken riscv build

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Message-ID: <CAEf4BzYJRqf4ho3hSmXWi2oTMts69ix8nODcoePmnUfg+jjdbQ@mail.gmail.com>
Date:   Tue, 17 Nov 2020 17:43:16 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Björn Töpel <bjorn.topel@...il.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        xi.wang@...il.com, luke.r.nels@...il.com,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH bpf-next 1/3] selftests/bpf: Fix broken riscv build

On Tue, Nov 17, 2020 at 12:28 AM Björn Töpel <bjorn.topel@...il.com> wrote:
>
> The selftests/bpf Makefile includes system include directories from
> the host, when building BPF programs. On RISC-V glibc requires that
> __riscv_xlen is defined. This is not the case for "clang -target bpf",
> which messes up __WORDSIZE (errno.h -> ... -> wordsize.h) and breaks
> the build.
>
> By explicitly defining __risc_xlen correctly for riscv, we can
> workaround this.
>
> Fixes: 167381f3eac0 ("selftests/bpf: Makefile fix "missing" headers on build with -idirafter")
> Signed-off-by: Björn Töpel <bjorn.topel@...il.com>
> ---
>  tools/testing/selftests/bpf/Makefile | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> index c1708ffa6b1c..9d48769ad268 100644
> --- a/tools/testing/selftests/bpf/Makefile
> +++ b/tools/testing/selftests/bpf/Makefile
> @@ -219,7 +219,8 @@ $(RESOLVE_BTFIDS): $(BPFOBJ) | $(BUILD_DIR)/resolve_btfids  \
>  # build would have failed anyways.
>  define get_sys_includes
>  $(shell $(1) -v -E - </dev/null 2>&1 \
> -       | sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }')
> +       | sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \
> +       $(shell $(1) -dM -E - </dev/null | grep '#define __riscv_xlen ' |sed 's/#define /-D/' | sed 's/ /=/')

just nits: second $(shell ) invocation should be at the same
indentation level as the first one

also '|sed' -> '| sed' ?

Otherwise I have no idea what this does and no way to try it on
RISC-V, but it doesn't break my setup, so I'm fine with it. ;)


>  endef
>
>  # Determine target endianness.
> --
> 2.27.0
>