From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id B2F503858431; Mon, 11 Mar 2024 12:04:42 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org B2F503858431 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1710158682; bh=//L0NvQbG+IluTOzB9pbU7wOV6wmBZ8qb4bZiiCvbAY=; h=From:To:Subject:Date:From; b=uXsXk7Izl0zsE6hqQDc7nEI5Nzxe/wX1RuQAaGsNaEIJYqOyEN+L5CY9P0zKrCYI9 ZyzfX0Vg2ekgCVQ/uYnmLTEu5TjCyIhwks+GNhwrF2KHTcAeR8/phlNkrLaOrMGymx loaRBH+WOyFGP8HTfY4QxAT2Q+A8neRj4Qu9FMJc= From: "jochen447 at concept dot de" To: gcc-bugs@gcc.gnu.org Subject: [Bug c/114306] New: wrong diagnostic with -Waddress (enabled by -Wall) Date: Mon, 11 Mar 2024 12:04:40 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c X-Bugzilla-Version: 12.2.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: jochen447 at concept dot de X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status bug_severity priority component assigned_to reporter target_milestone attachments.created Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 List-Id: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114306 Bug ID: 114306 Summary: wrong diagnostic with -Waddress (enabled by -Wall) Product: gcc Version: 12.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: jochen447 at concept dot de Target Milestone: --- Created attachment 57667 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D57667&action=3Dedit minified test case The compiler option -Waddress erroneously reports a warning for the attached simplified test case (warn_gcc.c): $ gcc -Waddress warn_gcc.c -o warn_gcc warn_gcc.c: In function =E2=80=98func=E2=80=99: warn_gcc.c:17:49: warning: the comparison will always evaluate as =E2=80=98= true=E2=80=99 for the address of =E2=80=98value=E2=80=99 will never be NULL [-Waddress] 17 | return (condA>0 ? cont->value : (int*)NULL) ? "foo" : "bar"; | ^ warn_gcc.c:13:9: note: =E2=80=98value=E2=80=99 declared here 13 | int value[1]; | ^~~~~ $ gcc -v Using built-in specs. COLLECT_GCC=3Dgcc COLLECT_LTO_WRAPPER=3D/usr/lib/gcc/x86_64-linux-gnu/12/lto-wrapper OFFLOAD_TARGET_NAMES=3Dnvptx-none:amdgcn-amdhsa OFFLOAD_TARGET_DEFAULT=3D1 Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion=3D'Debian 12.2.0-14' --with-bugurl=3Dfile:///usr/share/doc/gcc-12/README.Bugs --enable-languages=3Dc,ada,c++,go,d,fortran,objc,obj-c++,m2 --prefix=3D/usr --with-gcc-major-version-only --program-suffix=3D-12 --program-prefix=3Dx86_64-linux-gnu- --enable-shared --enable-linker-build-= id --libexecdir=3D/usr/lib --without-included-gettext --enable-threads=3Dposix --libdir=3D/usr/lib --enable-nls --enable-clocale=3Dgnu --enable-libstdcxx-= debug --enable-libstdcxx-time=3Dyes --with-default-libstdcxx-abi=3Dnew --enable-gnu-unique-object --disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib --enable-libphobos-checking=3Drelea= se --with-target-system-zlib=3Dauto --enable-objc-gc=3Dauto --enable-multiarch --disable-werror --enable-cet --with-arch-32=3Di686 --with-abi=3Dm64 --with-multilib-list=3Dm32,m64,mx32 --enable-multilib --with-tune=3Dgeneric --enable-offload-targets=3Dnvptx-none=3D/build/gcc-12-bTRWOB/gcc-12-12.2.0/= debian/tmp-nvptx/usr,amdgcn-amdhsa=3D/build/gcc-12-bTRWOB/gcc-12-12.2.0/deb= ian/tmp-gcn/usr --enable-offload-defaulted --without-cuda-driver --enable-checking=3Drelease --build=3Dx86_64-linux-gnu --host=3Dx86_64-linux-gnu --target=3Dx86_64-linu= x-gnu Thread model: posix Supported LTO compression algorithms: zlib zstd gcc version 12.2.0 (Debian 12.2.0-14) $ uname -a Linux linux64c 6.1.0-18-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.76-1 (2024-02-01) x86_64 GNU/Linux $ cat /etc/debian_version 12.5=