[Bug target/59516] New: [4.9 Regression] Multiple definition of `X' / of `non-virtual thunk to X' errors with LTO

[Bug target/59516] New: [4.9 Regression] Multiple definition of `X' / of `non-virtual thunk to X' errors with LTO

[d.g.gorbachev at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59516

            Bug ID: 59516
           Summary: [4.9 Regression] Multiple definition of `X' / of
                    `non-virtual thunk to X' errors with LTO
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: d.g.gorbachev at gmail dot com
            Target: i686-w64-mingw32

Created attachment 31442
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31442&action=edit
Testcase (compile with `-O2 -flto -shared')

GCC 4.9.0 20131208 (experimental).

/tmp/ccwAdNny.o (symbol from
plugin):(.gnu.linkonce.t._ZN1S2fnEv[__ZThn8_N1S2fnEv]+0x0): multiple definition
of `S::fn()'
/tmp/ccwhiDw7.o (symbol from
plugin):(.gnu.linkonce.t._ZN1S2fnEv[__ZThn4_N1S2fnEv]+0x0): first defined here
/tmp/ccwAdNny.o (symbol from
plugin):(.gnu.linkonce.t._ZN1S2fnEv[__ZThn8_N1S2fnEv]+0x0): multiple definition
of `non-virtual thunk to S::fn()'
/tmp/ccwhiDw7.o (symbol from
plugin):(.gnu.linkonce.t._ZN1S2fnEv[__ZThn4_N1S2fnEv]+0x0): first defined here
/tmp/ccwAdNny.o (symbol from
plugin):(.gnu.linkonce.t._ZN1S2fnEv[__ZThn8_N1S2fnEv]+0x0): multiple definition
of `non-virtual thunk to S::fn()'
/tmp/ccwhiDw7.o (symbol from
plugin):(.gnu.linkonce.t._ZN1S2fnEv[__ZThn4_N1S2fnEv]+0x0): first defined here
collect2: error: ld returned 1 exit status

[Bug target/59516] [4.9 Regression] Multiple definition of `X' / of `non-virtual thunk to X' errors with LTO

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59516

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |hubicka at gcc dot gnu.org
   Target Milestone|---                         |4.9.0

[Bug target/59516] [4.9 Regression] Multiple definition of `X' / of `non-virtual thunk to X' errors with LTO

[ktietz at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59516

Kai Tietz <ktietz at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |ktietz at gcc dot gnu.org
         Resolution|---                         |INVALID

--- Comment #1 from Kai Tietz <ktietz at gcc dot gnu.org> ---
This issue is a known binutils' ld bug. Issue here is that object-file
arguments aren't treated proper for LTO-plugin.
Work-a-round for this is adding all files into library by ar-tool, and doing
linking via it (Side-note be aware that you will need to mark classes then via
dllexport).