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[87.7.128.191]) by smtp.gmail.com with ESMTPSA id i12-20020a170906250c00b008adc971f5acsm2655543ejb.178.2023.02.10.09.22.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 10 Feb 2023 09:22:04 -0800 (PST) From: Andrea Righi To: Miguel Ojeda , Alex Gaynor , Wedson Almeida Filho Cc: Boqun Feng , Gary Guo , bjorn3_gh@protonmail.com, Nathan Chancellor , Nick Desaulniers , Tom Rix , rust-for-linux@vger.kernel.org, llvm@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH] rust: allow to use INIT_STACK_ALL_ZERO Date: Fri, 10 Feb 2023 18:22:03 +0100 Message-Id: <20230210172203.101331-1-andrea.righi@canonical.com> X-Mailer: git-send-email 2.37.2 MIME-Version: 1.0 X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED, SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1757466183728146119?= X-GMAIL-MSGID: =?utf-8?q?1757466183728146119?= With CONFIG_INIT_STACK_ALL_ZERO enabled, bindgen is passing -ftrivial-auto-var-init=zero to clang, that triggers the following: error: '-ftrivial-auto-var-init=zero' hasn't been enabled; enable it at your own peril for benchmarking purpose only with '-enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang' This flag should be dropped in clang-17, but at the moment it seems more reasonable to add it to the bindgen CFLAGS to prevent the error above. In this way we can enable CONFIG_INIT_STACK_ALL_ZERO with CONFIG_RUST without triggering any build error. Link: https://reviews.llvm.org/D125142 Signed-off-by: Andrea Righi --- rust/Makefile | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/rust/Makefile b/rust/Makefile index ff70c4c916f8..5e26db07a1dc 100644 --- a/rust/Makefile +++ b/rust/Makefile @@ -267,7 +267,8 @@ BINDGEN_TARGET := $(BINDGEN_TARGET_$(SRCARCH)) # All warnings are inhibited since GCC builds are very experimental, # many GCC warnings are not supported by Clang, they may only appear in # some configurations, with new GCC versions, etc. -bindgen_extra_c_flags = -w --target=$(BINDGEN_TARGET) +bindgen_extra_c_flags = -w --target=$(BINDGEN_TARGET) \ + -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang bindgen_c_flags = $(filter-out $(bindgen_skip_c_flags), $(c_flags)) \ $(bindgen_extra_c_flags)