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([2620:10d:c090:500::5:b61b]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-31586777bdasm20204635eec.22.2026.08.05.14.21.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Aug 2026 14:21:48 -0700 (PDT) Message-ID: Subject: Re: [RFC PATCH bpf-next v5 1/8] selftests/bpf: keep headers off the generic link command line From: Eduard Zingerman To: Mykola Lysenko , bpf@vger.kernel.org Cc: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, jolsa@kernel.org, memxor@gmail.com Date: Wed, 05 Aug 2026 14:21:47 -0700 In-Reply-To: <20260804170156.1709916-2-nickolay.lysenko@gmail.com> References: <20260804170156.1709916-1-nickolay.lysenko@gmail.com> <20260804170156.1709916-2-nickolay.lysenko@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.60.1 (3.60.1-1.fc44) Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2026-08-04 at 10:01 -0700, Mykola Lysenko wrote: > The generic '$(OUTPUT)/%:%.c' rule links with '$(LINK.c) $^', so > every prerequisite of such a binary lands on the compiler driver's > command line. That only works while none of them is a header: gcc > tolerates a stray .h argument on a link line, but clang treats it as > a request to precompile the header and fails with "cannot specify -o > when generating multiple output files". >=20 > Filter headers out of the recipe, with a comment: header > prerequisites on these targets are useful for dependency tracking - > the next patch declares one - and the constraint is easy to > rediscover the hard way. >=20 > Signed-off-by: Mykola Lysenko > --- Acked-by: Eduard Zingerman ...