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From: "gprocida+abigail at google dot com" <sourceware-bugzilla@sourceware.org>
To: libabigail@sourceware.org
Subject: [Bug default/27554] New: abidw emits unreachable types and
 declarations
Date: Tue, 09 Mar 2021 23:22:51 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27554

            Bug ID: 27554
           Summary: abidw emits unreachable types and declarations
           Product: libabigail
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: default
          Assignee: dodji at redhat dot com
          Reporter: gprocida+abigail at google dot com
                CC: libabigail at sourceware dot org
  Target Milestone: ---

A fairly common thing to do is to expose C bindings only, even if a library=
 is
written in C++ (or some other language).

We noticed that ABI XML contains all (or at least very many) of the C++
declarations and their type dependencies found in the DWARF, even if none of
these contribute to the ABI of such a library.

For one AOSP library, a rough analysis I did suggested that of the 153358 t=
ypes
emitted in the XML, only 103 of them are reachable from the exported library
symbols. Similarly, there are 15261 declarations with mangled-name attribut=
es,
but only 66 exported symbols. There are clearly massive space savings possi=
ble.

Dodji, do you think this would be a lot of work to implement within libabig=
ail
itself?

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