Fwd: Debug package request for libcoro-perl

Trying to forward this conversation again... I'm not very smart :)

I blame trying to reply via my phone.

Forwarded conversation
Subject: Debug package request for libcoro-perl
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From: Martin Pritchard <martin.pritchard@smoothwall.net>
Date: Mon, Oct 19, 2015 at 5:28 AM
To: pkg-perl-maintainers@lists.alioth.debian.org

Hey,

Recently I have been trying to diagnose a segfault issue in my Coro program and found that having the debug symbols for libcoro-perl was useful to help identify whether the underlying issue was directly in my code or Coro itself. I ended up building a 'libcoro-perl-dbg' package to do this and wondered whether it would be possible to get a Coro debug package included in Debian to help with issues like this in the future?

I have attached a patch which updates Coro's makefile to include debug symbols and I've also included updated examples for debian/control and debian/rules to build 'libcoro-perl-dbg'.

Thanks,

Martin Pritchard
Developer

smoothwall
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From: Jonathan Yu <jawnsy@cpan.org>
Date: Mon, Oct 19, 2015 at 6:31 AM
To: Martin Pritchard <martin.pritchard@smoothwall.net>

Hi Martin,

Thanks for your note, and your patch!

Forwarding to the Debian Perl mailing list, which we use for discussion.

I would've thought that the debug symbols would already be included in the libcoro-perl package. I wonder how much of a size difference it makes, since that would seem to be the only difference. As far as my limited understanding, debug symbols wouldn't affect optimisation flags, right?

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From: Martin Pritchard <martin.pritchard@smoothwall.net>
Date: Mon, Oct 19, 2015 at 6:54 AM
To: Jonathan Yu <jawnsy@cpan.org>

Hi Jonathan,

I added '-g' to get debugging on, as that wasn't on by default. The build output continues to include '-O2' so it still gets optimisation (although I didn't find where the -O2 flags were actually coming from). After building with symbols in, they were still being stripped out by debhelper so I've just overridden dh_strip to include the stripped headers in an optional debug package :)

On reading further, it looks like the -g will by default set optimisation to 0 if it's not specified, but I don't see during build time. Modifying my patch to include "-g -O2" wouldn't hurt to be safe.

It looks like the resultant main package (libcoro-perl) does not change size after building an additional libcoro-perl-dbg package, so it looks pretty self contained. The debug package comes out at about 166K.

Thanks for your help,

Cheers,

Jonathan