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From: "markus.boeck02 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/97729] [11 Regression] Link failure due to
 basic_stringbuf and others when building DLL on MinGW
Date: Thu, 05 Nov 2020 14:00:54 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97729

--- Comment #2 from Markus B=C3=B6ck <markus.boeck02 at gmail dot com> ---
Created attachment 49507
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D49507&action=3Dedit
config.h

Applied the patch and it fixed the issue regarding the undefined references.
Still getting the multiple definitions of exception_ptr:

/mnt/c/GCC-Build/NewestLinux/bin/x86_64-w64-mingw32-ld:
../libsupc++/.libs/libsupc++convenience.a(nested_exception.o): in function
`std::__exception_ptr::exception_ptr::~exception_ptr()':
C:/GCC-Build-Array/gcc/build-host-x86_64/x86_64-w64-mingw32/libstdc++-v3/li=
bsupc++/C:/GCC-Build-Array/gcc/build-host-x86_64/x86_64-w64-mingw32/libstdc=
++-v3/include/bits/exception_ptr.h:194:
multiple definition of `std::__exception_ptr::exception_ptr::~exception_ptr=
()';
../libsupc++/.libs/libsupc++convenience.a(eh_ptr.o):C:/GCC-Build-Array/gcc/=
build-host-x86_64/x86_64-w64-mingw32/libstdc++-v3/libsupc++/C:/GCC-Build-Ar=
ray/gcc/build-host-x86_64/x86_64-w64-mingw32/libstdc++-v3/include/bits/exce=
ption_ptr.h:194:
first defined here
/mnt/c/GCC-Build/NewestLinux/bin/x86_64-w64-mingw32-ld:
../src/c++11/.libs/libc++11convenience.a(future.o): in function
`std::__exception_ptr::exception_ptr::exception_ptr()':
C:/GCC-Build-Array/gcc/build-host-x86_64/x86_64-w64-mingw32/libstdc++-v3/sr=
c/c++11/C:/GCC-Build-Array/gcc/build-host-x86_64/x86_64-w64-mingw32/libstdc=
++-v3/include/bits/std_mutex.h:105:
multiple definition of `std::__exception_ptr::exception_ptr::exception_ptr(=
)';
../libsupc++/.libs/libsupc++convenience.a(eh_ptr.o):C:/GCC-Build-Array/gcc/=
build-host-x86_64/x86_64-w64-mingw32/libstdc++-v3/libsupc++/C:/GCC-Build-Ar=
ray/gcc/build-host-x86_64/x86_64-w64-mingw32/libstdc++-v3/include/bits/exce=
ption_ptr.h:176:
first defined here

I am using a cross compiler setup (though in WSL 1) as well so I'd be curio=
us
what leads to the differences in reproducability as this is not the first t=
ime
this has happened. I'll attach my config.h if that helps. The MinGW version=
 I
use is current trunk.=