[Bug default/26993] New: something is being lost in the abi

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

https://sourceware.org/bugzilla/show_bug.cgi?id=26993

            Bug ID: 26993
           Summary: something is being lost in the abi
           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: ---

When running abidw --abidiff /lib64/libmutter-7.so.0.0.0
from mutter-3.38.1-3.fc33.x86_64

There are a ton of changes being reported

18 functions with some indirect sub-type change:

  [C] 'function void
meta_wayland_client_hide_from_window_list(MetaWaylandClient*, MetaWindow*)' at
meta-wayland-client.c:303:1 has some indirect sub-type changes:
    parameter 2 of type 'MetaWindow*' has sub-type changes:
      in pointed to type 'typedef MetaWindow' at types.h:32:1:
        underlying type 'struct _MetaWindow' at window-private.h:160:1 changed:
          type size hasn't changed
          4 data member changes:
            type of 'MetaDisplay* _MetaWindow::display' changed:
              in pointed to type 'typedef MetaDisplay' at types.h:29:1:
                underlying type 'struct _MetaDisplay' at
display-private.h:107:1 changed:
                  type size hasn't changed
                  4 data member changes:
                    type of 'MetaWindow* _MetaDisplay::focus_window' changed:
                      in pointed to type 'typedef MetaWindow' at types.h:32:1:
                        underlying type 'struct _MetaWindow' changed, as being
reported
                    type of 'MetaWindow* _MetaDisplay::autoraise_window'
changed:
                      in pointed to type 'typedef MetaWindow' at types.h:32:1:
                        underlying type 'struct _MetaWindow' changed, as being
reported
                    type of 'MetaWindow* _MetaDisplay::grab_window' changed:
                      in pointed to type 'typedef MetaWindow' at types.h:32:1:
                        underlying type 'struct _MetaWindow' changed, as being
reported
                    type of 'MetaStack* _MetaDisplay::stack' changed:
                      in pointed to type 'typedef MetaStack' at
display-private.h:50:1:
                        underlying type 'struct _MetaStack' at stack.h:52:1
changed:
                          type size hasn't changed
                          1 data member change:
                            type of 'MetaDisplay* _MetaStack::display' changed:
                              in pointed to type 'typedef MetaDisplay' at
types.h:29:1:
                                underlying type 'struct _MetaDisplay' changed,
as being reported
            type of 'MetaWindow* _MetaWindow::transient_for' changed:
              in pointed to type 'typedef MetaWindow' at types.h:32:1:
                underlying type 'struct _MetaWindow' changed, as being reported
            type of 'MetaWindow* _MetaWindow::attached_focus_window' changed:
              in pointed to type 'typedef MetaWindow' at types.h:32:1:
                underlying type 'struct _MetaWindow' changed, as being reported
            type of 'MetaWindow* _MetaWindow::tile_match' changed:
              in pointed to type 'typedef MetaWindow' at types.h:32:1:
                underlying type 'struct _MetaWindow' changed, as being reported
<snip>

but looking through all the output I cannot figure out what the crux of the
change that is being reported is. It doesn't seem to be either of the "union"
problem or the "declared becoming defined" problem.

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