linux-kernel - Re: [PATCH bpf] libbpf: Fix build on read-only filesystems

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Date:   Sun, 22 Dec 2019 21:45:30 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>, bpf <bpf@...r.kernel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Shuah Khan <shuah@...nel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH bpf] libbpf: Fix build on read-only filesystems

On Sun, Dec 22, 2019 at 7:05 PM Namhyung Kim <namhyung@...nel.org> wrote:
>
> I got the following error when I tried to build perf on a read-only
> filesystem with O=dir option.
>
>   $ cd /some/where/ro/linux/tools/perf
>   $ make O=$HOME/build/perf
>   ...
>     CC       /home/namhyung/build/perf/lib.o
>   /bin/sh: bpf_helper_defs.h: Read-only file system
>   make[3]: *** [Makefile:184: bpf_helper_defs.h] Error 1
>   make[2]: *** [Makefile.perf:778: /home/namhyung/build/perf/libbpf.a] Error 2
>   make[2]: *** Waiting for unfinished jobs....
>     LD       /home/namhyung/build/perf/libperf-in.o
>     AR       /home/namhyung/build/perf/libperf.a
>     PERF_VERSION = 5.4.0
>   make[1]: *** [Makefile.perf:225: sub-make] Error 2
>   make: *** [Makefile:70: all] Error 2
>
> It was becaused bpf_helper_defs.h was generated in current directory.
> Move it to OUTPUT directory.
>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---

Looks good, thanks!

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

>  tools/lib/bpf/Makefile               | 15 ++++++++-------
>  tools/testing/selftests/bpf/Makefile |  6 +++---
>  2 files changed, 11 insertions(+), 10 deletions(-)
>

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