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Iglesias" , Marcel Apfelbaum , Pierrick Bouvier , Paolo Bonzini Subject: [PATCH v2 04/20] meson: hide tsan related warnings Date: Tue, 22 Oct 2024 11:55:58 +0100 Message-Id: <20241022105614.839199-5-alex.bennee@linaro.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20241022105614.839199-1-alex.bennee@linaro.org> References: <20241022105614.839199-1-alex.bennee@linaro.org> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Pierrick Bouvier When building with gcc-12 -fsanitize=thread, gcc reports some constructions not supported with tsan. Found on debian stable. qemu/include/qemu/atomic.h:36:52: error: ‘atomic_thread_fence’ is not supported with ‘-fsanitize=thread’ [-Werror=tsan] 36 | #define smp_mb() ({ barrier(); __atomic_thread_fence(__ATOMIC_SEQ_CST); }) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Signed-off-by: Pierrick Bouvier Reviewed-by: Thomas Huth Message-Id: <20240910174013.1433331-2-pierrick.bouvier@linaro.org> Signed-off-by: Alex Bennée --- meson.build | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/meson.build b/meson.build index d26690ce20..bdd67a2d6d 100644 --- a/meson.build +++ b/meson.build @@ -538,7 +538,15 @@ if get_option('tsan') prefix: '#include ') error('Cannot enable TSAN due to missing fiber annotation interface') endif - qemu_cflags = ['-fsanitize=thread'] + qemu_cflags + tsan_warn_suppress = [] + # gcc (>=11) will report constructions not supported by tsan: + # "error: ‘atomic_thread_fence’ is not supported with ‘-fsanitize=thread’" + # https://gcc.gnu.org/gcc-11/changes.html + # However, clang does not support this warning and this triggers an error. + if cc.has_argument('-Wno-tsan') + tsan_warn_suppress = ['-Wno-tsan'] + endif + qemu_cflags = ['-fsanitize=thread'] + tsan_warn_suppress + qemu_cflags qemu_ldflags = ['-fsanitize=thread'] + qemu_ldflags endif