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From: "rpsalmi at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/103867] New: Redefinition of typeinfo name of default
 argument lambda
Date: Thu, 30 Dec 2021 13:41:19 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103867

            Bug ID: 103867
           Summary: Redefinition of typeinfo name of default argument
                    lambda
           Product: gcc
           Version: 11.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rpsalmi at gmail dot com
  Target Milestone: ---

#include <functional>

template<class>
struct A {
  A(std::function<void()> v =3D [](){}) {}
};

template<class>
struct B {
  A<int> member;
  B() =3D default;
  B(int v) {}
};

int main() {
  B<int>();
  B<int>(0);
}



$ gcc source.cpp
source.cpp:18:1: error: redefinition of =E2=80=98const char
_ZTSZN1AIiEC4ESt8functionIFvvEEEd_UlvE_ []=E2=80=99
   18 | }
      | ^
source.cpp:18:1: note: =E2=80=98const char _ZTSZN1AIiEC4ESt8functionIFvvEEE=
d_UlvE_
[36]=E2=80=99 previously defined here


$ gcc -v
Using built-in specs.
COLLECT_GCC=3Dgcc
COLLECT_LTO_WRAPPER=3D/usr/lib/gcc/x86_64-pc-linux-gnu/11.1.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /build/gcc/src/gcc/configure --prefix=3D/usr --libdir=3D/u=
sr/lib
--libexecdir=3D/usr/lib --mandir=3D/usr/share/man --infodir=3D/usr/share/in=
fo
--with-bugurl=3Dhttps://bugs.archlinux.org/
--enable-languages=3Dc,c++,ada,fortran,go,lto,objc,obj-c++,d --with-isl
--with-linker-hash-style=3Dgnu --with-system-zlib --enable-__cxa_atexit
--enable-cet=3Dauto --enable-checking=3Drelease --enable-clocale=3Dgnu
--enable-default-pie --enable-default-ssp --enable-gnu-indirect-function
--enable-gnu-unique-object --enable-install-libiberty --enable-linker-build=
-id
--enable-lto --enable-multilib --enable-plugin --enable-shared
--enable-threads=3Dposix --disable-libssp --disable-libstdcxx-pch
--disable-libunwind-exceptions --disable-werror
gdc_include_dir=3D/usr/include/dlang/gdc
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 11.1.0 (GCC)=