libstdc++ pretty-printers don't work with Python 3

[Nelson Elhage]

Ubuntu builds gdb's Python support against Python 3, but the STL pretty-printers shipped with libstdc++ don't support Python 3:

(gdb) python
>import os, sys
>stldir = '/usr/share/gcc-4.7/python/'
>if os.path.isdir(stldir):
> sys.path.insert(0, stldir)
> from libstdcxx.v6.printers import register_libstdcxx_printers
> register_libstdcxx_printers (None)
>end
Traceback (most recent call last):
  File "<string>", line 5, in <module>
  File "/usr/share/gcc-4.7/python/libstdcxx/v6/printers.py", line 45
    raise ValueError, "Cannot find type %s::%s" % (str(orig), name)
                    ^
SyntaxError: invalid syntax
Error while executing Python code.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: gcc-4.8 4.8.1-10ubuntu9
ProcVersionSignature: Ubuntu 3.11.0-13.20-generic 3.11.6
Uname: Linux 3.11.0-13-generic x86_64
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
Date: Fri Nov 29 15:06:03 2013
InstallationDate: Installed on 2012-12-02 (362 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MarkForUpload: True
SourcePackage: gcc-4.8
UpgradeStatus: Upgraded to saucy on 2013-10-19 (41 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Pascal Giard (pascalgiard-debian)]

Thanks to 2to3 and minor manual modifications, I got the libstdc++ pretty printers to work with Python3. In case it can be useful to others:
http://organact.mine.nu/dokuwiki/_media/astuces:printers.py.xz

[kajokeji (kajokeji-2013)]

Thank you Pascal. YES it was very useful !

[Rüdiger Sonderfeld (ruediger-c-plusplus)]

Debian has also fixed this for gcc-4.8. Please apply the change to Ubuntu as well.

http://metadata.ftp-master.debian.org/changelogs//main/g/gcc-4.8/gcc-4.8_4.8.2-23_changelog

gcc-4.8 (4.8.2-23)
> * Update the libstdc++v-python3 patch. Closes: #748317.

[Rüdiger Sonderfeld (ruediger-c-plusplus)]

Part of the patch is upstream: https://gcc.gnu.org/ml/libstdc++/2014-05/msg00094.html

[Matthias Klose (doko)]

fixed in utopic

[ori (ori-livneh)]

This has been fixed upstream: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58962
Could the fix be applied for trusty?

[Simon Marchi (simon-marchi)]

Given that trusty is an LTS, it would indeed be interesting to get this fixed. What is the procedure for this? Is there anything I can do to help?

[Matthias Klose (doko)]

fixed in trusty with the 4.8.4 backport

[phil (fongpwf)]

I don't understand the comment about the fix being in Trusty. I only see gcc 4.8.2 in Trusty. There's not 4.8.4 (yet). There's no gcc in trusty-backports either.

[Mathew Hodson (mhodson)]

Phil, the fix is in gcc-4.8 (4.8.4-2ubuntu1~14.04), which is available in trusty-updates.