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[1.164.68.170]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-39ae610e5b2sm9994013a91.0.2026.09.08.06.47.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Sep 2026 06:47:41 -0700 (PDT) From: Cheng-Yang Chou To: sched-ext@lists.linux.dev, Tejun Heo , David Vernet , Andrea Righi , Changwoo Min Cc: Ching-Chun Huang , Chia-Ping Tsai , chengyang.chou@mediatek.com, Cheng-Yang Chou Subject: [PATCH 2/2] selftests/sched_ext: Move -rdynamic to LDFLAGS and append to it Date: Tue, 8 Sep 2026 21:47:09 +0800 Message-ID: <20260908134722.8671-3-yphbchou0911@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260908134722.8671-2-yphbchou0911@gmail.com> References: <20260908134722.8671-1-yphbchou0911@gmail.com> <20260908134722.8671-2-yphbchou0911@gmail.com> Precedence: bulk X-Mailing-List: sched-ext@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit CFLAGS passes the link-time flag -rdynamic to compile steps ($(CC) -c), where it is unused. Under -Werror, Clang fails the build: $ make CC=clang-21 clang-21: error: argument unused during compilation: '-rdynamic' [-Werror,-Wunused-command-line-argument] Unlike the demo schedulers, the selftest runner requires -rdynamic at link time to populate .dynsym for testcases. Additionally, LDFLAGS uses '=' rather than '+=', silently discarding USERLDFLAGS from lib.mk. Move -rdynamic from CFLAGS to LDFLAGS and append with '+='. This fixes builds with CC=clang-N while preserving symbol export and USERLDFLAGS. Signed-off-by: Cheng-Yang Chou --- tools/testing/selftests/sched_ext/Makefile | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/sched_ext/Makefile b/tools/testing/selftests/sched_ext/Makefile index 3cfe90e0f34fa..c756285a4903e 100644 --- a/tools/testing/selftests/sched_ext/Makefile +++ b/tools/testing/selftests/sched_ext/Makefile @@ -53,7 +53,7 @@ ifneq ($(wildcard $(GENHDR)),) GENFLAGS := -DHAVE_GENHDR endif -CFLAGS += -g -O2 -rdynamic -pthread -Wall -Werror $(GENFLAGS) \ +CFLAGS += -g -O2 -pthread -Wall -Werror $(GENFLAGS) \ -I$(INCLUDE_DIR) -I$(GENDIR) -I$(LIBDIR) \ -I$(TOOLSINCDIR) -I$(APIDIR) -I$(CURDIR)/include -I$(SCXTOOLSINCDIR) @@ -62,7 +62,7 @@ ifneq ($(LLVM),) CFLAGS += -Wno-unused-command-line-argument endif -LDFLAGS = -lelf -lz -lpthread -lzstd +LDFLAGS += -rdynamic -lelf -lz -lpthread -lzstd IS_LITTLE_ENDIAN = $(shell $(CC) -dM -E -