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Tue, 04 Mar 2025 14:24:53 -0800 (PST) Received: from draig.lan ([185.126.160.109]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-abf692b6b44sm523833166b.112.2025.03.04.14.24.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 04 Mar 2025 14:24:51 -0800 (PST) Received: from draig.lan (localhost [IPv6:::1]) by draig.lan (Postfix) with ESMTP id 1E28C5FCAA; Tue, 4 Mar 2025 22:24:41 +0000 (GMT) From: =?utf-8?q?Alex_Benn=C3=A9e?= To: qemu-devel@nongnu.org Cc: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Eduardo Habkost , Li-Wen Hsu , Peter Maydell , Laurent Vivier , qemu-arm@nongnu.org, Alexandre Iooss , Paolo Bonzini , Richard Henderson , Riku Voipio , Warner Losh , Brian Cain , Mahmoud Mandour , Kyle Evans , =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , Ed Maste , Pierrick Bouvier , =?utf-8?q?Marc-Andr=C3=A9_L?= =?utf-8?q?ureau?= , =?utf-8?q?Alex_Benn=C3=A9e?= , Thomas Huth Subject: [PATCH v2 17/32] tests/tcg: Suppress compiler false-positive warning on sha1.c Date: Tue, 4 Mar 2025 22:24:24 +0000 Message-Id: <20250304222439.2035603-18-alex.bennee@linaro.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250304222439.2035603-1-alex.bennee@linaro.org> References: <20250304222439.2035603-1-alex.bennee@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::635; envelope-from=alex.bennee@linaro.org; helo=mail-ej1-x635.google.com X-Spam_score_int: 12 X-Spam_score: 1.2 X-Spam_bar: + X-Spam_report: (1.2 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_SBL_CSS=3.335, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: qemu-devel-bounces+patch=linaro.org@nongnu.org From: Peter Maydell GCC versions at least 12 through 15 incorrectly report a warning about code in sha1.c: tests/tcg/multiarch/sha1.c:161:13: warning: ‘SHA1Transform’ reading 64 bytes from a region of size 0 [-Wstringop-overread] 161 | SHA1Transform(context->state, &data[i]); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ This is a piece of stock library code for doing SHA1 which we've simply copied, rather than writing ourselves. The bug has been reported to upstream GCC (about a different library's use of this code): https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106709 For our test case, since this isn't our original code and there isn't actually a bug in it, suppress the incorrect warning rather than trying to modify the code to work around the compiler issue. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2328 Signed-off-by: Peter Maydell Reviewed-by: Richard Henderson Message-Id: <20250227141343.1675415-1-peter.maydell@linaro.org> [AJB: -Wno-unknown-warning-option for clang's sake] Signed-off-by: Alex Bennée --- tests/tcg/aarch64/Makefile.target | 3 ++- tests/tcg/arm/Makefile.target | 3 ++- tests/tcg/hexagon/Makefile.target | 2 +- tests/tcg/multiarch/Makefile.target | 8 ++++++++ 4 files changed, 13 insertions(+), 3 deletions(-) diff --git a/tests/tcg/aarch64/Makefile.target b/tests/tcg/aarch64/Makefile.target index 9efe2f81ad..16ddcf4f88 100644 --- a/tests/tcg/aarch64/Makefile.target +++ b/tests/tcg/aarch64/Makefile.target @@ -83,7 +83,8 @@ test-aes: CFLAGS += -O -march=armv8-a+aes test-aes: test-aes-main.c.inc # Vector SHA1 -sha1-vector: CFLAGS=-O3 +# Work around compiler false-positive warning, as we do for the 'sha1' test +sha1-vector: CFLAGS=-O3 -Wno-stringop-overread sha1-vector: sha1.c $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $< -o $@ $(LDFLAGS) run-sha1-vector: sha1-vector run-sha1 diff --git a/tests/tcg/arm/Makefile.target b/tests/tcg/arm/Makefile.target index 99a953b667..6189d7a0e2 100644 --- a/tests/tcg/arm/Makefile.target +++ b/tests/tcg/arm/Makefile.target @@ -61,7 +61,8 @@ endif ARM_TESTS += commpage # Vector SHA1 -sha1-vector: CFLAGS=-O3 +# Work around compiler false-positive warning, as we do for the 'sha1' test +sha1-vector: CFLAGS=-O3 -Wno-stringop-overread sha1-vector: sha1.c $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $< -o $@ $(LDFLAGS) run-sha1-vector: sha1-vector run-sha1 diff --git a/tests/tcg/hexagon/Makefile.target b/tests/tcg/hexagon/Makefile.target index e5182c01d8..4dfc39bc98 100644 --- a/tests/tcg/hexagon/Makefile.target +++ b/tests/tcg/hexagon/Makefile.target @@ -18,7 +18,7 @@ # Hexagon doesn't support gdb, so skip the EXTRA_RUNS EXTRA_RUNS = -CFLAGS += -Wno-incompatible-pointer-types -Wno-undefined-internal +CFLAGS += -Wno-incompatible-pointer-types -Wno-undefined-internal -Wno-unknown-warning-option CFLAGS += -fno-unroll-loops -fno-stack-protector HEX_SRC=$(SRC_PATH)/tests/tcg/hexagon diff --git a/tests/tcg/multiarch/Makefile.target b/tests/tcg/multiarch/Makefile.target index 688a6be203..c769a7d69d 100644 --- a/tests/tcg/multiarch/Makefile.target +++ b/tests/tcg/multiarch/Makefile.target @@ -45,6 +45,14 @@ vma-pthread: LDFLAGS+=-pthread sigreturn-sigmask: CFLAGS+=-pthread sigreturn-sigmask: LDFLAGS+=-pthread +# GCC versions 12/13/14/15 at least incorrectly complain about +# "'SHA1Transform' reading 64 bytes from a region of size 0"; see the gcc bug +# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106709 +# Since this is just a standard piece of library code we've borrowed for a +# TCG test case, suppress the warning rather than trying to modify the +# code to work around the compiler. +sha1: CFLAGS+=-Wno-stringop-overread + # The vma-pthread seems very sensitive on gitlab and we currently # don't know if its exposing a real bug or the test is flaky. ifneq ($(GITLAB_CI),)