netdev - Re: [PATCH] bpfilter: check if $(CC) can static link in Kconfig

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Date:   Sat, 9 May 2020 18:04:32 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Valdis Kletnieks <valdis.kletnieks@...edu>,
        LKML <linux-kernel@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andriin@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH] bpfilter: check if $(CC) can static link in Kconfig

On Sat, May 9, 2020 at 12:40 AM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> On Fedora, linking static libraries requires the glibc-static RPM
> package, which is not part of the glibc-devel package.
>
> CONFIG_CC_CAN_LINK does not check the capability of static linking,
> so you can enable CONFIG_BPFILTER_UMH, then fail to build.
>
>   HOSTLD  net/bpfilter/bpfilter_umh
> /usr/bin/ld: cannot find -lc
> collect2: error: ld returned 1 exit status
>
> Add CONFIG_CC_CAN_LINK_STATIC, and make CONFIG_BPFILTER_UMH depend
> on it.
>
> Reported-by: Valdis Kletnieks <valdis.kletnieks@...edu>
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>

Thanks!
Acked-by: Alexei Starovoitov <ast@...nel.org>