From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 3EB8A385700A; Tue, 29 Jun 2021 20:09:35 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 3EB8A385700A From: "gcc at alanwu dot email" To: gcc-bugs@gcc.gnu.org Subject: [Bug c/101265] New: C2X [[maybe_unused]] ignored when placed after array declaration Date: Tue, 29 Jun 2021 20:09:35 +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: 11.1.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: gcc at alanwu dot email 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 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 X-BeenThere: gcc-bugs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-bugs mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 29 Jun 2021 20:09:35 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101265 Bug ID: 101265 Summary: C2X [[maybe_unused]] ignored when placed after array declaration Product: gcc Version: 11.1.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: gcc at alanwu dot email Target Milestone: --- With the following: void foo(void) { [[maybe_unused]] int thisworks[1]; int thisdoesnt[1] [[maybe_unused]]; } GCC 11 warns: $ gcc-11 -std=3Dc2x -pedantic -Wall -c test.c test.c: In function 'foo': test.c:3:5: warning: 'maybe_unused' attribute ignored [-Wattributes] 3 | int thisdoesnt[1] [[maybe_unused]]; | ^~~ test.c:3:9: warning: unused variable 'thisdoesnt' [-Wunused-variable] 3 | int thisdoesnt[1] [[maybe_unused]]; | ^~~~~~~~~~ Is this a bug? I'm not familiar with the spec. By the way, `g++-11` doesn't emit any warnings for the same file and `clang` seems to also accept it. gcc-11 -v: COLLECT_GCC=3Dgcc-11 COLLECT_LTO_WRAPPER=3D/usr/lib/gcc/x86_64-linux-gnu/11/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'Ubuntu 11.1.0-1ubuntu1~20.04' --with-bugurl=3Dfile:///usr/share/doc/gcc-11/README.= Bugs --enable-languages=3Dc,ada,c++,go,brig,d,fortran,objc,obj-c++,m2 --prefix= =3D/usr --with-gcc-major-version-only --program-suffix=3D-11 --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-bootstrap --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=3Drelease --with-target-system-zlib=3Dauto --enable-objc-gc=3Dauto --enable-multiarch --disable-werror --disable-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-11-2V7zgg/gcc-11-11.1.0/= debian/tmp-nvptx/usr,amdgcn-amdhsa=3D/build/gcc-11-2V7zgg/gcc-11-11.1.0/deb= ian/tmp-gcn/usr --without-cuda-driver --enable-checking=3Drelease --build=3Dx86_64-linux-gnu --host=3Dx86_64-linux-gnu --target=3Dx86_64-linux-gnu --with-build-config=3Dbootstrap-lto-lean --enable-link-serialization=3D2 Thread model: posix Supported LTO compression algorithms: zlib zstd gcc version 11.1.0 (Ubuntu 11.1.0-1ubuntu1~20.04) It seems to reproduce on trunk on Compiler Explorer: gcc (Compiler-Explorer-Build-gcc-7c6b354b92b38f31cd2399fbdbc9d6f837881480-binut= ils-2.36.1) 12.0.0 20210628 (experimental)=