[Bug default/27327] types seem to get confused in libjavascriptcoregtk-4.0.so.18.17.12

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

https://sourceware.org/bugzilla/show_bug.cgi?id=27327

--- Comment #1 from Ben Woodard <woodard at redhat dot com> ---
It may be that the thing that is going wrong is earlier where the ELF symbols
are being aliased. There is another thing that my testing kicks out which is
somewhat similar:

/home/ben/Shared/Work/test/libabigail-x86_64/bin/abidw --abidiff
/lib64/libstdc++.so.6.0.28
Download failed: File exists.  Continuing without debug info for
/home/ben/Shared/test/system-supplied DSO at 0x7ffff7fcf000.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Functions changes summary: 0 Removed, 1 Changed, 0 Added function
Variables changes summary: 0 Removed, 0 Changed, 0 Added variable

1 function with some indirect sub-type change:

  [C] 'method virtual int std::codecvt<char16_t, char,
__mbstate_t>::do_max_length() const' at codecvt.h:573:1 has some indirect
sub-type changes:
    Please note that the symbol of this function is
_ZNKSt7codecvtIDic11__mbstate_tE13do_max_lengthEv@@GLIBCXX_3.4.21
     and it aliases symbols:
_ZNKSt7codecvtIDsDu11__mbstate_tE13do_max_lengthEv@@GLIBCXX_3.4.26,
_ZNKSt7codecvtIDsc11__mbstate_tE13do_max_lengthEv@@GLIBCXX_3.4.21,
_ZNKSt7codecvtIDiDu11__mbstate_tE13do_max_lengthEv@@GLIBCXX_3.4.26
    'method virtual int std::codecvt<char16_t, char,
__mbstate_t>::do_max_length() const
{_ZNKSt7codecvtIDic11__mbstate_tE13do_max_lengthEv@@GLIBCXX_3.4.21,
_ZNKSt7codecvtIDsDu11__mbstate_tE13do_max_lengthEv@@GLIBCXX_3.4.26,
_ZNKSt7codecvtIDsc11__mbstate_tE13do_max_lengthEv@@GLIBCXX_3.4.21,
_ZNKSt7codecvtIDiDu11__mbstate_tE13do_max_lengthEv@@GLIBCXX_3.4.26}' now
becomes 'method virtual int std::codecvt<char32_t, char,
__mbstate_t>::do_max_length() const
{_ZNKSt7codecvtIDic11__mbstate_tE13do_max_lengthEv@@GLIBCXX_3.4.21,
_ZNKSt7codecvtIDsDu11__mbstate_tE13do_max_lengthEv@@GLIBCXX_3.4.26,
_ZNKSt7codecvtIDsc11__mbstate_tE13do_max_lengthEv@@GLIBCXX_3.4.21,
_ZNKSt7codecvtIDiDu11__mbstate_tE13do_max_lengthEv@@GLIBCXX_3.4.26}'
    implicit parameter 0 of type 'const std::codecvt<char16_t, char,
__mbstate_t>*' changed:
      in pointed to type 'const std::codecvt<char16_t, char, __mbstate_t>':
        'const std::codecvt<char16_t, char, __mbstate_t>' changed to 'const
std::codecvt<char32_t, char, __mbstate_t>'

[Inferior 1 (process 603341) exited with code 01]

There it is swapping a 32b function and a 16b function.

that was with libstdc++-10.2.1-9.fc33.x86_64 /lib64/libstdc++.so.6.0.28

Might be the same bug might be different hard to say but in this case I think
that they are the same.

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