[Bug default/27086] New: file reports errors with itself

["woodard at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27086

            Bug ID: 27086
           Summary: file reports errors with itself
           Product: libabigail
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: default
          Assignee: dodji at redhat dot com
          Reporter: woodard at redhat dot com
                CC: libabigail at sourceware dot org
  Target Milestone: ---

with master as of 9fc16dbc

abidw --abidiff
/home/ben/Shared/Work/spack/opt/spack/linux-fedora33-skylake/gcc-10.2.1/miniconda3-4.8.2-oudnbhbtypfh2ozp37mvcmbef4p2gjcv/lib/libstdc++.so.6.0.26

reports hundreds of differences with itself beginning with:

Functions changes summary: 0 Removed, 634 Changed, 0 Added functions
Variables changes summary: 0 Removed, 0 Changed, 0 Added variable

634 functions with some indirect sub-type change:

  [C] 'method void std::__cxx11::basic_istringstream<char,
std::char_traits<char>, std::allocator<char>
>::basic_istringstream(std::__cxx11::basic_istringstream<char,
std::char_traits<char>, std::allocator<char> >&&)' at sstream:477:1 has some
indirect sub-type changes:
    implicit parameter 0 of type 'std::__cxx11::basic_istringstream<char,
std::char_traits<char>, std::allocator<char> >*' has sub-type changes:
      in pointed to type 'class std::__cxx11::basic_istringstream<char,
std::char_traits<char>, std::allocator<char> >' at sstream:392:1:
        type size hasn't changed
        1 base class change:
          'class std::basic_istream<char, std::char_traits<char> >' at
istream:58:1 changed:
            type size hasn't changed
            2 member function insertions:
              'method virtual std::basic_istream<char, std::char_traits<char>
>::~basic_istream()' at istream:103:1, virtual at voffset 0/0
              'method virtual std::basic_istream<char, std::char_traits<char>
>::~basic_istream(int, void**)' at istream:103:1
            2 member function changes:
              'method virtual std::basic_istream<char, std::char_traits<char>
>::~basic_istream(int, void**)' has some sub-type changes:
                implicit parameter 0 of type 'std::basic_istream<char,
std::char_traits<char> >*' has sub-type changes:
                  pointed to type 'class std::basic_istream<char,
std::char_traits<char> >' changed, as being reported
              'method virtual std::basic_istream<char, std::char_traits<char>
>::~basic_istream()' has some sub-type changes:
                implicit parameter 0 of type 'std::basic_istream<char,
std::char_traits<char> >*' has sub-type changes:
                  pointed to type 'class std::basic_istream<char,
std::char_traits<char> >' changed, as being reported
        2 member function changes:
          'method virtual std::__cxx11::basic_istringstream<char,
std::char_traits<char>, std::allocator<char> >::~basic_istringstream(int,
void**)' has some sub-type changes:
            implicit parameter 0 of type
'std::__cxx11::basic_istringstream<char, std::char_traits<char>,
std::allocator<char> >*' has sub-type changes:
              pointed to type 'class std::__cxx11::basic_istringstream<char,
std::char_traits<char>, std::allocator<char> >' changed, as being reported
          'method virtual std::__cxx11::basic_istringstream<char,
std::char_traits<char>, std::allocator<char> >::~basic_istringstream()' has
some sub-type changes:
            implicit parameter 0 of type
'std::__cxx11::basic_istringstream<char, std::char_traits<char>,
std::allocator<char> >*' has sub-type changes:
              pointed to type 'class std::__cxx11::basic_istringstream<char,
std::char_traits<char>, std::allocator<char> >' changed, as being reported
    parameter 1 of type 'std::__cxx11::basic_istringstream<char,
std::char_traits<char>, std::allocator<char> >&&' has sub-type changes:
      referenced type 'class std::__cxx11::basic_istringstream<char,
std::char_traits<char>, std::allocator<char> >' changed at sstream:392:1, as
reported earlier

The origin appears to be:

 'method virtual std::basic_istream<char, std::char_traits<char>
>::~basic_istream()' at istream:103:1, virtual at voffset 0/0
 'method virtual std::basic_istream<char, std::char_traits<char>
>::~basic_istream(int, void**)' at istream:103:1

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