linux-kernel - Re: [PATCH] selftests: Fix build when $(O) points to a relative path

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Date:   Mon, 7 Feb 2022 11:22:58 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Muhammad Usama Anjum <usama.anjum@...labora.com>
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>, kernel@...labora.com,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH] selftests: Fix build when $(O) points to a relative path

On Fri, Feb 4, 2022 at 2:59 PM Muhammad Usama Anjum
<usama.anjum@...labora.com> wrote:
>
> Build of bpf and tc-testing selftests fails when the relative path of
> the build directory is specified.
>
> make -C tools/testing/selftests O=build0
> make[1]: Entering directory '/linux_mainline/tools/testing/selftests/bpf'
> ../../../scripts/Makefile.include:4: *** O=build0 does not exist.  Stop.
> make[1]: Entering directory '/linux_mainline/tools/testing/selftests/tc-testing'
> ../../../scripts/Makefile.include:4: *** O=build0 does not exist.  Stop.
>
> The fix is same as mentioned in commit 150a27328b68 ("bpf, preload: Fix
> build when $(O) points to a relative path").
>

I don't think it actually helps building BPF selftest. Even with this
patch applied, all the feature detection doesn't work, and I get
reallocarray redefinition failure when bpftool is being built as part
of selftest.

> Signed-off-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
> ---
>  tools/testing/selftests/Makefile | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
> index 4eda7c7c15694..aa0faf132c35a 100644
> --- a/tools/testing/selftests/Makefile
> +++ b/tools/testing/selftests/Makefile
> @@ -178,6 +178,7 @@ all: khdr
>                 BUILD_TARGET=$$BUILD/$$TARGET;                  \
>                 mkdir $$BUILD_TARGET  -p;                       \
>                 $(MAKE) OUTPUT=$$BUILD_TARGET -C $$TARGET       \
> +                               O=$(abs_objtree)                \
>                                 $(if $(FORCE_TARGETS),|| exit); \
>                 ret=$$((ret * $$?));                            \
>         done; exit $$ret;
> @@ -185,7 +186,8 @@ all: khdr
>  run_tests: all
>         @for TARGET in $(TARGETS); do \
>                 BUILD_TARGET=$$BUILD/$$TARGET;  \
> -               $(MAKE) OUTPUT=$$BUILD_TARGET -C $$TARGET run_tests;\
> +               $(MAKE) OUTPUT=$$BUILD_TARGET -C $$TARGET run_tests \
> +                               O=$(abs_objtree);                   \
>         done;
>
>  hotplug:
> --
> 2.30.2
>