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From: "andrew.c.morrow at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: libabigail@sourceware.org
Subject: [Bug default/21023] New: The abidw tool does not appear to read
 dwarf from .dwp files associated with executables
Date: Sun, 01 Jan 2017 00:00:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D21023

            Bug ID: 21023
           Summary: The abidw tool does not appear to read dwarf from .dwp
                    files associated with executables
           Product: libabigail
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: default
          Assignee: dodji at redhat dot com
          Reporter: andrew.c.morrow at gmail dot com
                CC: libabigail at sourceware dot org
  Target Milestone: ---

$ abidw --version
1.0.rc7
I'm not actually sure if this is a bug in libabigail, or one of the support=
ing
libraries like libelf or libdw, but I'm starting here, since the end state I
want is that abidw works binaries built using DebugFission.

I would expect that abidw would search for DWARF info in the associated .dwp
file, however, it does not appear to do so.

On my Ubuntu 16.04 machine:

$ g++ --version
g++ (Ubuntu 5.4.0-6ubuntu1~16.04.4) 5.4.0 20160609

$ dwp --version
GNU dwp (GNU Binutils for Ubuntu) 2.26.1

$ cat hello_world.cpp
#include <cstdlib>
#include <iostream>

int main(int argc, char* argv[]) {
    std::cout << "Hello, World!\n" << argc;
    return EXIT_SUCCESS;
}

$ g++ -g ./hello_world.cpp -o hello_world
$ abidw ./hello_world | cksum
1150852500 53174

$ g++ -gsplit-dwarf -g ./hello_world.cpp -o hello_world
$ dwp -e ./hello_world
$ abidw ./hello_world | cksum
2156308181 1319

As you can see from the sizes, running abidw against the DebugFission versi=
on
results in severely truncated output. Running under strace appears to confi=
rm
that the dwp file was never stat'ed or read:

$ strace -f -o trace abidw ./hello_world | cksum
2156308181 1319
$ grep -c dwp trace
0

--=20
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