[Bug c++/103186] New: redefinition of template symbol error with strange error diagnostic

[dl.soluz at gmx dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103186

            Bug ID: 103186
           Summary: redefinition of template symbol error with strange
                    error diagnostic
           Product: gcc
           Version: 11.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dl.soluz at gmx dot net
  Target Milestone: ---

Created attachment 51764
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51764&action=edit
test source

How to reproduce

use the attached test.cpp - i reduced it as much as possible while keeping the
error(s) intact

good case - problematik parts are disabled:

gcc -Wall -Wextra -std=c++17 test.cpp

test 1: (https://gcc.godbolt.org/z/WvqbWq1e5)

gcc -Wall -Wextra -std=c++17 test.cpp -DTEST=1 
est.cpp:77:12: error: redefinition of ‘const char
_ZTSZN12GetSetHelperIaE3setESt8functionIFvvEEEd_UlDpOT_E_ []’
   77 | int main(){}
      |            ^
test.cpp:77:12: note: ‘const char
_ZTSZN12GetSetHelperIaE3setESt8functionIFvvEEEd_UlDpOT_E_ [54]’ previously
defined here

test 2:
gcc -Wall -Wextra -std=c++17 test.cpp -DTEST=2

/usr/bin/ld:
/tmp/ccCdRNNd.o:(.data.rel.ro._ZTIZN12GetSetHelperIhE3setESt8functionIFvvEEEd_UlDpOT_E_[_ZTIZN12GetSetHelperIhE3setESt8functionIFvvEEEd_UlDpOT_E_]+0x0):
undefined reference to `vtable for __cxxabiv1::__class_type_info'
/usr/bin/ld:
/tmp/ccCdRNNd.o:(.data.rel.ro._ZTIZN12GetSetHelperIaE3setESt8functionIFvvEEEd_UlDpOT_E_[_ZTIZN12GetSetHelperIaE3setESt8functionIFvvEEEd_UlDpOT_E_]+0x0):
undefined reference to `vtable for __cxxabiv1::__class_type_info'
/usr/bin/ld:
/tmp/ccCdRNNd.o:(.data.rel.local.DW.ref.__gxx_personality_v0[DW.ref.__gxx_personality_v0]+0x0):
undefined reference to `__gxx_personality_v0'
collect2: error: ld returned 1 exit status

this linker problem does not occure on gcc.godbolt - maybe a Ubuntu ld only
problem

Test with other versions, compilers:

error occures also with gcc.godbolt trunk/11.2/11.1, does not happen with gcc
10.3 or lower

does not happen with Clang versions down to 8.x and further
does not happen with VS2017/2019(up to date versions)

System:

using up-to-date(11.11.2021) Ubuntu 21.10 x64 with default gcc 11.2.0, clang
13.x and default ld 2.37

$ uname -a
Linux linux 5.13.0-20-generic #20-Ubuntu SMP Fri Oct 15 14:21:35 UTC 2021
x86_64 x86_64 x86_64 GNU/Linux

$ gcc -v

Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/11/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 11.2.0-7ubuntu2'
--with-bugurl=file:///usr/share/doc/gcc-11/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,m2 --prefix=/usr
--with-gcc-major-version-only --program-suffix=-11
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib
--enable-libphobos-checking=release --with-target-system-zlib=auto
--enable-objc-gc=auto --enable-multiarch --disable-werror --enable-cet
--with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32
--enable-multilib --with-tune=generic
--enable-offload-targets=nvptx-none=/build/gcc-11-ZPT0kp/gcc-11-11.2.0/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-11-ZPT0kp/gcc-11-11.2.0/debian/tmp-gcn/usr
--without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
--with-build-config=bootstrap-lto-lean --enable-link-serialization=2
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 11.2.0 (Ubuntu 11.2.0-7ubuntu2) 

$ ld -v
GNU ld (GNU Binutils for Ubuntu) 2.37