From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 420963858C55; Tue, 8 Nov 2022 19:57:13 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 420963858C55 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1667937433; bh=moqJLdzKcwCg7V4hd3Di9w+T/t1bal9sbUoYnw7I2LE=; h=From:To:Subject:Date:From; b=rxbHoX7o7JNpvK3OMXRppjxMVbZQDsMPpOmYHIbWBwilXmlOsUsw7EnSWHxJ/BMzV rzEcjPCRuxqM9uKIf61r/snSAbk5HJArzsvmRT3eeMys22IxGgsM/N4cBPtrEynSHe yjganOIb8zKmYbvTsQhRcM5c3EWovmt3reeWDdfw= From: "vyas.ramasubramani at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug libstdc++/107580] New: std::vector cannot be brace initialized with -D_GLIBCXX_USE_CXX11_ABI=0 Date: Tue, 08 Nov 2022 19:57:11 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: libstdc++ X-Bugzilla-Version: 12.2.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: vyas.ramasubramani at gmail dot com 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=3D107580 Bug ID: 107580 Summary: std::vector cannot be brace initialized with -D_GLIBCXX_USE_CXX11_ABI=3D0 Product: gcc Version: 12.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libstdc++ Assignee: unassigned at gcc dot gnu.org Reporter: vyas.ramasubramani at gmail dot com Target Milestone: --- The type of the argument to the constructor of A cannot be correctly inferr= ed when using the old ABI: #include #include struct A { A(std::string const& file_path) {} A(std::vector const& file_path) {} }; int main() { std::string x =3D "hello"; std::string y =3D "goodbye"; // Both of the below will fail. A a{{x, y}}; A a =3D A({x, y}); } Here's the output from running the compilation: (test_gcc) vyasr-dt% g++ test.cpp -D_GLIBCXX_USE_CXX11_ABI=3D0 test.cpp: In function =E2=80=98int main()=E2=80=99: test.cpp:11:16: error: call of overloaded =E2=80=98A()=E2=80=99 is ambiguous 11 | A a1{{x, y}}; | ^ test.cpp:5:5: note: candidate: =E2=80=98A::A(const std::vector >&)=E2=80=99 5 | A(std::vector const& file_path) {} | ^ test.cpp:4:5: note: candidate: =E2=80=98A::A(const string&)=E2=80=99 4 | A(std::string const& file_path) {} | ^ test.cpp:12:20: error: call of overloaded =E2=80=98A()=E2=80=99 is ambiguous 12 | A a2 =3D A({x, y}); | ^ test.cpp:5:5: note: candidate: =E2=80=98A::A(const std::vector >&)=E2=80=99 5 | A(std::vector const& file_path) {} | ^ test.cpp:4:5: note: candidate: =E2=80=98A::A(const string&)=E2=80=99 4 | A(std::string const& file_path) {} | ^ And here is my current version information: (test_gcc) vyasr-dt% g++ -v=20=20=20=20=20=20=20 Using built-in specs. COLLECT_GCC=3Dg++ COLLECT_LTO_WRAPPER=3D/usr/lib/gcc/x86_64-linux-gnu/9/lto-wrapper OFFLOAD_TARGET_NAMES=3Dnvptx-none:hsa OFFLOAD_TARGET_DEFAULT=3D1 Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion=3D'Ubuntu 9.4.0-1ubuntu1~20.04.1' --with-bugurl=3Dfile:///usr/share/doc/gcc-9/README.= Bugs --enable-languages=3Dc,ada,c++,go,brig,d,fortran,objc,obj-c++,gm2 --prefix= =3D/usr --with-gcc-major-version-only --program-suffix=3D-9 --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 --with-target-system-zlib=3Dauto --enable-objc-gc=3Dauto --enable-multiarch --disable-werror --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-9-Av3uEd/gcc-9-9.4.0/deb= ian/tmp-nvptx/usr,hsa --without-cuda-driver --enable-checking=3Drelease --build=3Dx86_64-linux-gnu --host=3Dx86_64-linux-gnu --target=3Dx86_64-linux-gnu Thread model: posix gcc version 9.4.0 (Ubuntu 9.4.0-1ubuntu1~20.04.1)=20 Here is an example using the Compiler Explorer showing that this issue is specific to libstdc++ and the old ABI flag: https://godbolt.org/z/jqoc6j3be. For instance, with clang the error appears unless `-stdlib=3Dlibc++` is specified, at which point the code compiles successfully.=