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([2a01:e0a:cf7:f430:7f29:f252:787e:d826]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-436e9dc8826sm52670285e9.11.2025.01.10.05.26.14 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 10 Jan 2025 05:26:14 -0800 (PST) Message-ID: <130a5041-bd78-4347-950b-65c605678ce6@gmail.com> Date: Fri, 10 Jan 2025 14:26:52 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-US, fr To: elfutils-devel@sourceware.org From: Phi Subject: [PATCH] libcpu: Remove false positive null ptr deref warning for GCC, -O3 X-Spam-Status: No, score=-9.0 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, GIT_PATCH_0, HTML_MESSAGE, KAM_NUMSUBJECT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: elfutils-devel@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Elfutils-devel mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: elfutils-devel-bounces~patchwork=sourceware.org@sourceware.org Hi All, I try to send a patch via thunderbird, I don't know if the process is correct. I tried from gmail but it was not good. The patch is trivial and I use it to learn the patch submission process, along with the signed-off-by process Cheers, Phi From 3ac65cf6eec36a9a22af378e89bc4d5b148d8713 Mon Sep 17 00:00:00 2001 From: Philippe Benard Date: Thu, 9 Jan 2025 14:59:00 +0100 Subject: [PATCH] libcpu: Remove false positive null ptr deref warning for GCC -O3 See bugzilla Bug#32527 * libcpu/Makefile.am i386_lex_CFLAGS += $(subst -O3,-Wno-null-dereference,$(findstring -O3,$(CFLAGS))) i386_lex_CFLAGS is a make variable to tweak the i386_lex.c.o specific compile flags. The are already some -W defined there, I'd like to add one to avoid seeing false warning during build with -O3 compile flag. GCC 14.2 (as well as 13.x) produce a false positive warning for the i386 lexer, a bug is filled already against GCC for that, CLANG is imune. Signed-off-by: Philippe Benard --- libcpu/Makefile.am | 2 ++ 1 file changed, 2 insertions(+) diff --git a/libcpu/Makefile.am b/libcpu/Makefile.am index 32835237..2e87021b 100644 --- a/libcpu/Makefile.am +++ b/libcpu/Makefile.am @@ -91,6 +91,8 @@ libeu = ../lib/libeu.a i386_lex_CFLAGS = -Wno-unused-label -Wno-unused-function -Wno-sign-compare \ -Wno-implicit-fallthrough +i386_lex_CFLAGS += $(subst -O3,-Wno-null-dereference,$(findstring -O3,$(CFLAGS))) + i386_parse.o: i386_parse.c i386.mnemonics i386_lex.o: i386_parse.h i386_gendis_LDADD = $(libeu) -lm $(obstack_LIBS) -- 2.43.0