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From: "woodard at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: libabigail@sourceware.org
Subject: [Bug default/27514] New: recursively compare libraries in abicompat
Date: Thu, 04 Mar 2021 18:02:20 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27514

            Bug ID: 27514
           Summary: recursively compare libraries in abicompat
           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: ---

This is similar and kind of related to 27208 but goes a bit deeper.

abicompat currently only compares one library at a time when evaluating lib=
rary
compatibility. For example:

abicompat app libfoo-v1 libfoo-v2=20

The app is also likely to have other dependencies which require ABI artifac=
ts
out of libfoo that the app itself may not use.=20

app requires libfoo.so and libbar.so
   app only uses foo_init()
   libbar uses additional functions out of libfoo.so

Currently abicompat would say that app is compatible with libfoo so long as
foo_init() didn't change. However, if libfoo-v2 had changes that impacted
libbar.so which is needed by the app then libfoo-v2 is not compatible with =
the
app.

Therefore the comparison currently done by abicompat where it simply looks =
at
the undefined symbols in the app is not sufficient to guarantee that libfoo=
-v1
and libfoo-v2 are in fact compatible with the application. It must also loo=
k at
the dependencies needed by app and include any symbols provided by them.

To be able to address this problem while not breaking current behavior a new
mode of operation is needed for abicompat one that loads the corpora not ju=
st
for the app but also for all its dependencies and then does the abi compari=
son.

--=20
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