[Bug c++/70112] New: [lto] Segmentation fault in Libreoffice's program gengal.bin when build with LTO

[kabel at blackhole dot sk]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70112

            Bug ID: 70112
           Summary: [lto] Segmentation fault in Libreoffice's program
                    gengal.bin when build with LTO
           Product: gcc
           Version: 5.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: kabel at blackhole dot sk
  Target Milestone: ---

Created attachment 37882
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37882&action=edit
gengal-backtrace.txt

As Steffen Hau has posted in the comments on PR50394, Libreoffice's program
gengal.bin fails with segmentation fault during compilation of Libreoffice
itself. I have studied it more, and the problem seems with
libreoffice-5.0.5.2/bridges (libgcc3_uno.so), which are "Bridges from various
C++ ABIs, Java JNI, MS .Net to UNO and back.", as described by README.

When I compiled libgcc3_uno.so with LTO disabled, gengal.bin ran successfully.

Attaching gdb's backtrace when segmentation fault.

The problem seems to be in the destructor
bridges::cpp_uno::shared::CppInterfaceProxy::~CppInterfaceProxy()
which is defined in bridges/source/cpp_uno/shared/cppinterfaceproxy.cxx

CppInterfaceProxy::~CppInterfaceProxy()
{}

And also called from there from function freeCppInterfaceProxy:

pThis->~CppInterfaceProxy();