gdb: upgrade to be python 3 compatible

[LukeMauldin]

What steps will reproduce the problem?
If possible, include a link to a program on play.golang.org.
1. Build a Golang program and launch is with GDB.  Using Ubuntu 13.10, GDB 7.6.1. 
Golang version 1.2rc2.  Note, I have go installed in /opt/go and I have a symbolic link
linking /usr/local/go to /opt/go

What is the expected output?
Debugging to work correctly

What do you see instead?
luke@luke-laptop:~/projects/goexternal/src/tf/meetingmessage$ gdb ./meetingmessage 
GNU gdb (GDB) 7.6.1-ubuntu
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>;
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>;...
Reading symbols from
/home/luke/projects/goexternal/src/tf/meetingmessage/meetingmessage...done.
  File "/opt/go/src/pkg/runtime/runtime-gdb.py", line 358
    print s, ptr['goid'], "%8s" % sts[long((ptr['status']))], blk.function
          ^
SyntaxError: invalid syntax
(gdb)

[robpike]

Comment 1:

Looks like Python 3 looking at Python 2 code. Does gdb 7.6.1 and/or your system require
Python 3?

Status changed to WaitingForReply.

[gopherbot]

Comment 2 by scaganoff:

I get this same error after upgrading Ubuntu 13.04 to 13.10.
My default python is:
Python 2.7.5+ (default, Sep 19 2013, 13:48:49)

[minux]

Comment 3:

Ubuntu 13.10's gdb is using python 3 (as verified by ldd: it links to
libpython3.3m.so.1.0).
For the time being, I suggest you install (or build) a gdb with python2 binding.

Labels changed: added priority-later, removed priority-triage.

Status changed to Accepted.

[rsc]

Comment 4:

Labels changed: added go1.3maybe.

[rsc]

Comment 5:

Labels changed: added release-none, removed go1.3maybe.

[rsc]

Comment 6:

Labels changed: added repo-main.

[gopherbot]

Comment 7 by robertknight:

Here is an initial patch which updates runtime-gdb.py to be Python 2.6.x+ / Python 3.x
compatible: https://gist.github.com/robertknight/7973000
I've done very basic testing with it - inspecting goroutines etc.

Attachments:

1. runtime-gdb.py.diff (3321 bytes)

[gopherbot]

Comment 8 by gigovich:

my version of fix https://golang.org/cl/43780045

[gopherbot]

Comment 9:

Good workaround from
https://groups.google.com/forum/#!msg/golang-nuts/VcmSvq2mSm0/LfTp3CUhel8J :
2to3 -w PATH_TO_GO/src/pkg/runtime/runtime-gdb.py

[robpike]

Comment 10:

Labels changed: added gdb.

[minux]

Comment 11:

Has this issue been fully addressed by https://golang.org/cl/53590043?