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From: "gprocida at google dot com" <sourceware-bugzilla@sourceware.org>
To: libabigail@sourceware.org
Subject: [Bug default/28120] New: abidw: anonymous types and naming typedefs
Date: Thu, 22 Jul 2021 11:16:01 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28120

            Bug ID: 28120
           Summary: abidw: anonymous types and naming typedefs
           Product: libabigail
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: default
          Assignee: dodji at redhat dot com
          Reporter: gprocida at google dot com
                CC: libabigail at sourceware dot org
  Target Milestone: ---

Created attachment 13563
  --> https://sourceware.org/bugzilla/attachment.cgi?id=3D13563&action=3Ded=
it
compressed ABI XML file

Consider this:

typedef struct { int b; } foo;
typedef struct { int b; } bar;
void fun(foo a, bar b) { (void)a; (void)b; }

Compiling results in one type for the struct and two types for the typedefs.
The struct has one naming typedef (and cannot have two, obviously).

We've seen issues with the Linux kernel where isomorphic anonymous structs =
with
different naming typedefs in different compilation units end up as the same
type id in the XML, but appear twice with different naming typedef ids.

The attachment illustrates the issue with type id 8425539a. In terms of ABI
diffing this is probably a low priority issue - I don't think naming typede=
f is
even inspected.

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