[Bug c++/65057] New: Broken shared library if created with -fuse-ld=gold -shared -Wl,--dynamic-list

["manisandro at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65057

            Bug ID: 65057
           Summary: Broken shared library if created with -fuse-ld=gold
                    -shared -Wl,--dynamic-list
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: manisandro at gmail dot com

Created attachment 34752
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34752&action=edit
testcase

What follows is with gcc-5.0.0-0.10.fc22.x86_64 (Fedora rawhide).

See test case attached, build and run with the provided build.sh script.

Overview:

- A base class in a shared library (base.h, base.cpp)
- The shared library is linked with  -fuse-ld=gold -shared -Wl,--dynamic-list,
the contents of the actual list provided to --dynamic-list does not seem to
matter (in the provided testcase, the name of the symbol is made up).

- A derived class in an application linking with the library (derived.h,
derived.cpp)
- Some random class which uses the derived class

Problem:
- The assertion at derived.h:25 fails
=> Derived::Derived calls Base::Base passing a DerivedPrivate instance to the
base class, then Derived::Derived calls Base::init, which sets Base::self to
the instance pointer this and calls DerivedPrivate::foo on the passed
DerivedPrivate instance, which tests that Base::self is not null. This
incorrectly fails.


Background:
This is causing Qt5 applications to crash in various ways.