netdev - Re: [PATCH bpf-next] tools build: propagate build failures from tools/build/Makefile.build

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Date:   Sat, 1 Aug 2020 20:33:00 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Andrii Nakryiko <andriin@...com>
Cc:     bpf <bpf@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Kernel Team <kernel-team@...com>, Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Masahiro Yamada <masahiroy@...nel.org>
Subject: Re: [PATCH bpf-next] tools build: propagate build failures from tools/build/Makefile.build

On Thu, Jul 30, 2020 at 7:44 PM Andrii Nakryiko <andriin@...com> wrote:
>
> The '&&' command seems to have a bad effect when $(cmd_$(1)) exits with
> non-zero effect: the command failure is masked (despite `set -e`) and all but
> the first command of $(dep-cmd) is executed (successfully, as they are mostly
> printfs), thus overall returning 0 in the end.
>
> This means in practice that despite compilation errors, tools's build Makefile
> will return success. We see this very reliably with libbpf's Makefile, which
> doesn't get compilation error propagated properly. This in turns causes issues
> with selftests build, as well as bpftool and other projects that rely on
> building libbpf.
>
> The fix is simple: don't use &&. Given `set -e`, we don't need to chain
> commands with &&. The shell will exit on first failure, giving desired
> behavior and propagating error properly.
>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Fixes: 275e2d95591e ("tools build: Move dependency copy into function")
> Signed-off-by: Andrii Nakryiko <andriin@...com>

Jiri, Arnaldo,
could you please review and ack?