From: Mykola Lysenko <nickolay.lysenko@gmail.com>
To: bpf@vger.kernel.org
Cc: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
eddyz87@gmail.com, martin.lau@linux.dev, song@kernel.org,
yonghong.song@linux.dev, jolsa@kernel.org, memxor@gmail.com,
nickolay.lysenko@gmail.com
Subject: [PATCH bpf-next v8 1/9] selftests/bpf: keep headers off the generic link command line
Date: Mon, 21 Sep 2026 00:58:47 -0700 [thread overview]
Message-ID: <20260921075855.2065871-2-nickolay.lysenko@gmail.com> (raw)
In-Reply-To: <20260921075855.2065871-1-nickolay.lysenko@gmail.com>
The generic '$(OUTPUT)/%:%.c' rule links with '$(LINK.c) $^', so every
prerequisite reaches the compiler driver. A header argument makes clang
fail with "cannot specify -o when generating multiple output files".
Filter headers out of the link command while retaining them as
prerequisites.
Signed-off-by: Mykola Lysenko <nickolay.lysenko@gmail.com>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
---
tools/testing/selftests/bpf/Makefile | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 7ea5ba1df29e..bfb788ea6561 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -257,9 +257,11 @@ $(OUTPUT)/%.o: %.c
$(call msg,CC,,$@)
$(Q)$(CC) $(CFLAGS) -c $(filter %.c,$^) $(LDLIBS) -o $@
+# Keep header prerequisites off the link command: clang treats
+# bare headers as precompiled-header jobs and refuses -o.
$(OUTPUT)/%:%.c
$(call msg,BINARY,,$@)
- $(Q)$(LINK.c) $^ $(LDLIBS) -o $@
+ $(Q)$(LINK.c) $(filter-out %.h,$^) $(LDLIBS) -o $@
# LLVM's ld.lld doesn't support all the architectures, so use it only on x86
ifeq ($(SRCARCH),$(filter $(SRCARCH),x86 riscv))
--
2.43.0
next prev parent reply other threads:[~2026-09-21 7:59 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-21 7:58 [PATCH bpf-next v8 0/9] selftests/bpf: restructure the Makefile as a layered build Mykola Lysenko
2026-09-21 7:58 ` Mykola Lysenko [this message]
2026-09-21 7:58 ` [PATCH bpf-next v8 2/9] selftests/bpf: drop stale lines, restore two header dependencies Mykola Lysenko
2026-09-21 9:06 ` bot+bpf-ci
2026-09-21 9:21 ` Mykola Lysenko
2026-09-21 7:58 ` [PATCH bpf-next v8 3/9] selftests/bpf: factor the permissive-mode skip suffix into a helper Mykola Lysenko
2026-09-21 8:09 ` sashiko-bot
2026-09-21 7:58 ` [PATCH bpf-next v8 4/9] selftests/bpf: generate the signing key and certificate once Mykola Lysenko
2026-09-21 7:58 ` [PATCH bpf-next v8 5/9] selftests/bpf: generate verifier/tests.h in a regular recipe Mykola Lysenko
2026-09-21 9:06 ` bot+bpf-ci
2026-09-21 12:36 ` Mykola Lysenko
2026-09-21 7:58 ` [PATCH bpf-next v8 6/9] selftests/bpf: derive the bench object list from the sources Mykola Lysenko
2026-09-21 7:58 ` [PATCH bpf-next v8 7/9] selftests/bpf: extract BPF skeleton generation into a helper script Mykola Lysenko
2026-09-21 7:58 ` [PATCH bpf-next v8 8/9] selftests/bpf: move shared build definitions into Makefile.buildvars Mykola Lysenko
2026-09-21 7:58 ` [PATCH bpf-next v8 9/9] selftests/bpf: build each test runner instance in its own sub-make Mykola Lysenko
2026-09-21 9:22 ` bot+bpf-ci
2026-09-21 12:08 ` Mykola Lysenko
2026-09-21 9:28 ` [PATCH bpf-next v8 0/9] selftests/bpf: restructure the Makefile as a layered build Kumar Kartikeya Dwivedi
2026-09-21 9:30 ` patchwork-bot+netdevbpf
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