From: Leo Yan <leo.yan@arm.com>
To: Quentin Monnet <qmo@kernel.org>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <martin.lau@linux.dev>,
Eduard Zingerman <eddyz87@gmail.com>, Song Liu <song@kernel.org>,
Yonghong Song <yonghong.song@linux.dev>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>,
Stanislav Fomichev <sdf@fomichev.me>,
Hao Luo <haoluo@google.com>, Jiri Olsa <jolsa@kernel.org>,
Shuah Khan <shuah@kernel.org>, Lorenz Bauer <lmb@isovalent.com>,
Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <nick.desaulniers+lkml@gmail.com>,
Bill Wendling <morbo@google.com>,
Justin Stitt <justinstitt@google.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Ian Rogers <irogers@google.com>,
James Clark <james.clark@linaro.org>,
Kees Cook <kees@kernel.org>,
bpf@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-kselftest@vger.kernel.org, llvm@lists.linux.dev,
Leo Yan <leo.yan@arm.com>
Subject: [PATCH 6/6] selftests/bpf: Append extra cflags
Date: Mon, 23 Mar 2026 15:40:07 +0000 [thread overview]
Message-ID: <20260323-tools_build_fix_zero_init_bpf_only-v1-6-d1cfad2f4cd1@arm.com> (raw)
In-Reply-To: <20260323-tools_build_fix_zero_init_bpf_only-v1-0-d1cfad2f4cd1@arm.com>
Append EXTRA_CFLAGS to CFLAGS so that additional flags can be applied to
the compiler.
urandom_read is built with clang. Introduce URANDOM_READ_CFLAGS to copy
the compiler flags without appending EXTRA_CFLAGS, which may contain
incompatible options with clang.
Since lib.mk appends options to CFLAGS, ensure that CFLAGS is inherited
after including lib.mk.
Signed-off-by: Leo Yan <leo.yan@arm.com>
---
tools/testing/selftests/bpf/Makefile | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index f75c4f52c02842541f385bc8cbaeab32d8195ed3..50bcf4c386ba52e6cceef4c15f999d9eec6efd6e 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -158,6 +158,12 @@ endef
include ../lib.mk
+# urandom_read is built with clang. Copy $(CFLAGS) before EXTRA_CFLAGS are
+# appended so that it does not inherit potentially incompatible options.
+URANDOM_READ_CFLAGS := $(CFLAGS)
+
+CFLAGS += $(EXTRA_CFLAGS)
+
NON_CHECK_FEAT_TARGETS := clean docs-clean
CHECK_FEAT := $(filter-out $(NON_CHECK_FEAT_TARGETS),$(or $(MAKECMDGOALS), "none"))
ifneq ($(CHECK_FEAT),)
@@ -255,7 +261,7 @@ endif
$(OUTPUT)/liburandom_read.so: urandom_read_lib1.c urandom_read_lib2.c liburandom_read.map
$(call msg,LIB,,$@)
$(Q)$(CLANG) $(CLANG_TARGET_ARCH) \
- $(filter-out -static,$(CFLAGS) $(LDFLAGS)) \
+ $(filter-out -static,$(URANDOM_READ_CFLAGS) $(LDFLAGS)) \
$(filter %.c,$^) $(filter-out -static,$(LDLIBS)) \
-Wno-unused-command-line-argument \
-fuse-ld=$(LLD) -Wl,-znoseparate-code -Wl,--build-id=sha1 \
@@ -265,7 +271,7 @@ $(OUTPUT)/liburandom_read.so: urandom_read_lib1.c urandom_read_lib2.c liburandom
$(OUTPUT)/urandom_read: urandom_read.c urandom_read_aux.c $(OUTPUT)/liburandom_read.so
$(call msg,BINARY,,$@)
$(Q)$(CLANG) $(CLANG_TARGET_ARCH) \
- $(filter-out -static,$(CFLAGS) $(LDFLAGS)) $(filter %.c,$^) \
+ $(filter-out -static,$(URANDOM_READ_CFLAGS) $(LDFLAGS)) $(filter %.c,$^) \
-Wno-unused-command-line-argument \
-lurandom_read $(filter-out -static,$(LDLIBS)) -L$(OUTPUT) \
-fuse-ld=$(LLD) -Wl,-znoseparate-code -Wl,--build-id=sha1 \
--
2.34.1
prev parent reply other threads:[~2026-03-23 15:40 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-23 15:40 [PATCH 0/6] tools build: bpf: Append EXTRA_CFLAGS and HOST_EXTRACFLAGS Leo Yan
2026-03-23 15:40 ` [PATCH 1/6] bpftool: Avoid adding EXTRA_CFLAGS to HOST_CFLAGS Leo Yan
2026-03-31 8:46 ` kernel test robot
2026-03-23 15:40 ` [PATCH 2/6] bpftool: Append extra host flags Leo Yan
2026-03-23 15:40 ` [PATCH 3/6] libbpf: Initialize CFLAGS before including Makefile.include Leo Yan
2026-03-23 22:50 ` Ihor Solodrai
2026-03-23 15:40 ` [PATCH 4/6] tools/bpf: build: Append extra cflags Leo Yan
2026-03-23 15:40 ` [PATCH 5/6] selftests/bpf: Initialize operation name before use Leo Yan
2026-03-23 22:52 ` Ihor Solodrai
2026-03-24 6:58 ` Leo Yan
2026-03-24 15:55 ` Alexei Starovoitov
2026-03-23 15:40 ` Leo Yan [this message]
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