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References: <20200506065021.2881-1-dknightjun@gmail.com>
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From:   Cong Wang <xiyou.wangcong@gmail.com>
Date:   Wed, 6 May 2020 14:55:19 -0700
Message-ID: <CAM_iQpVyWmmOiz+x4fvQbeqQJ_u-bbCsY3o=aO4Yp0PmK8bYTg@mail.gmail.com>
Subject: Re: [PATCH] netfilter: fix make target xt_TCPMSS.o error.
To:     Huang Qijun <dknightjun@gmail.com>
Cc:     Pablo Neira Ayuso <pablo@netfilter.org>,
        Jozsef Kadlecsik <kadlec@netfilter.org>,
        Florian Westphal <fw@strlen.de>,
        David Miller <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Martin KaFai Lau <kafai@fb.com>,
        Song Liu <songliubraving@fb.com>, yhs@fb.com,
        Andrii Nakryiko <andriin@fb.com>,
        John Fastabend <john.fastabend@gmail.com>,
        kpsingh@chromium.org, NetFilter <netfilter-devel@vger.kernel.org>,
        coreteam@netfilter.org,
        Linux Kernel Network Developers <netdev@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>, bpf@vger.kernel.org
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On Tue, May 5, 2020 at 11:52 PM Huang Qijun <dknightjun@gmail.com> wrote:
>
> When compiling netfilter, there will be an error
> "No rule to make target 'net/netfilter/xt_TCPMSS.o'",
> because the xt_TCPMSS.c in the makefile is uppercase,
> and the file name of the source file (xt_tcpmss.c) is lowercase.
> Therefore, change the xt_TCPMSS.c name in the makefile to all lowercase.

This is what you will get when you compile Linux kernel
on a case-insensitive filesystem like MacOS.

Please use a case-sensitive one.