From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id DD3E93858D35; Sat, 6 May 2023 23:37:18 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org DD3E93858D35 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1683416238; bh=pMn9VIGaJkAXwAszhONCGvHN47QbAcgcI1omWptBof8=; h=From:To:Subject:Date:From; b=p+6vGn5en4QoHrEV8YGJ7tm4e64knaoG+3F7W+mn44unI/MYlj+EeIIitXsNknlst D4anMwb14pnIFKRL7/j6ZiG1C9hfE+g1c9/Nc5qHVl4PPsejqIdPvS6U//edd0sMSh x43RT6406FwlFS8capLaYoPZSOUSpEVXYtiGt5Jk= From: "andysem at mail dot ru" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/109761] New: Nested class destructor's noexcept specification incorrectly considered as too loose compared to the outer class Date: Sat, 06 May 2023 23:37:18 +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: 11.3.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: andysem at mail dot ru 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 List-Id: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109761 Bug ID: 109761 Summary: Nested class destructor's noexcept specification incorrectly considered as too loose compared to the outer class Product: gcc Version: 11.3.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: andysem at mail dot ru Target Milestone: --- Consider the following piece of code: template< typename T > T declval() noexcept; struct base { virtual ~base() {} }; class outer : public base { protected: class nested { private: outer& m_outer; public: explicit nested(outer& o) noexcept(noexcept(o.on_nested_ctor())) : m_outer(o) { o.on_nested_ctor(); } nested(nested const&) =3D delete; nested& operator=3D (nested const&) =3D delete; ~nested() noexcept(noexcept(declval().on_nested_dtor())) { m_outer.on_nested_dtor(); } }; public: ~outer() {} protected: void on_nested_ctor(); void on_nested_dtor(); }; This wrongly fails to compile: $ g++ -std=3Dgnu++17 -o nested_noexcept_dtor.o -c nested_noexcept_dtor.cpp= =20 nested_noexcept_dtor.cpp:28:9: error: looser exception specification on overriding virtual function =E2=80=98outer::nested::~nested() noexcept (fal= se)=E2=80=99 28 | ~nested() noexcept(noexcept(declval().on_nested_dtor())) | ^ nested_noexcept_dtor.cpp:6:13: note: overridden function is =E2=80=98virtual base::~base() noexcept=E2=80=99 6 | virtual ~base() {} | ^ The compiler tries to match the ~nested() noexcept specification against the ~base()'s as if nested was derived from base, but it is not. ~nested() noex= cept specification has no bearing on the outer class hierarchy. $ g++ -v Using built-in specs. COLLECT_GCC=3Dg++ 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 11.3.0-1ubuntu1~22.04' --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 --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-11-xKiWfi/gcc-11-11.3.0/= debian/tmp-nvptx/usr,amdgcn-amdhsa=3D/build/gcc-11-xKiWfi/gcc-11-11.3.0/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 11.3.0 (Ubuntu 11.3.0-1ubuntu1~22.04)=