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From: "pavel51tunin at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/94156] Multiple definition of destructor and non-virtual
 thunk for classes that use multiple inheritance when building static library
Date: Sat, 17 Oct 2020 08:52:29 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94156

=D0=9F=D0=B0=D0=B2=D0=B5=D0=BB =D0=A2=D1=8E=D0=BD=D0=B8=D0=BD <pavel51tunin=
 at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pavel51tunin at gmail dot =
com

--- Comment #2 from =D0=9F=D0=B0=D0=B2=D0=B5=D0=BB =D0=A2=D1=8E=D0=BD=D0=B8=
=D0=BD <pavel51tunin at gmail dot com> ---
Created attachment 49391
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D49391&action=3Dedit
minimal sample to reproduce the bug

This sample triggers this or similar bug on both mingw 9.2.0 and mingw-w64
10.2.1. Compilation log:
D:\test>g++ -O2 -flto -c test1.cpp

D:\test>g++ -O2 -flto -c test2.cpp

D:\test>g++ -flto -o test.exe test1.o test2.o
D:/mingw-w64/mingw/bin/../lib/gcc/i686-w64-mingw32/10.2.1/../../../../i686-=
w64-m
ingw32/bin/ld.exe: test2.o (symbol from
plugin):(.gnu.linkonce.t._ZN7Derived3foo
Ev[__ZThn4_N7Derived3fooEv]+0x0): multiple definition of `Derived::foo()';
test1
.o (symbol from
plugin):(.gnu.linkonce.t._ZN7Derived3fooEv[__ZThn8_N7Derived3foo
Ev]+0x0): first defined here
D:/mingw-w64/mingw/bin/../lib/gcc/i686-w64-mingw32/10.2.1/../../../../i686-=
w64-m
ingw32/bin/ld.exe: test2.o (symbol from
plugin):(.gnu.linkonce.t._ZN7Derived3foo
Ev[__ZThn4_N7Derived3fooEv]+0x0): multiple definition of `non-virtual thunk=
 to
D
erived::foo()'; test1.o (symbol from
plugin):(.gnu.linkonce.t._ZN7Derived3fooEv[
__ZThn8_N7Derived3fooEv]+0x0): first defined here
D:/mingw-w64/mingw/bin/../lib/gcc/i686-w64-mingw32/10.2.1/../../../../i686-=
w64-m
ingw32/bin/ld.exe: test2.o (symbol from
plugin):(.gnu.linkonce.t._ZN7Derived3foo
Ev[__ZThn4_N7Derived3fooEv]+0x0): multiple definition of `non-virtual thunk=
 to
D
erived::foo()'; test1.o (symbol from
plugin):(.gnu.linkonce.t._ZN7Derived3fooEv[
__ZThn8_N7Derived3fooEv]+0x0): first defined here
collect2.exe: error: ld returned 1 exit status=