Bug 219844 - devel/gdb: Allow builds with Python 3.x (tested with 3.6)
Summary: devel/gdb: Allow builds with Python 3.x (tested with 3.6)
Status: Closed FIXED
Alias: None
Product: Ports & Packages
Classification: Unclassified
Component: Individual Port(s) (show other bugs)
Version: Latest
Hardware: Any Any
: --- Affects Some People
Assignee: John Baldwin
URL: https://reviews.freebsd.org/D11465
Keywords: easy
Depends on:
Reported: 2017-06-07 15:56 UTC by Mikhail T.
Modified: 2017-07-11 17:26 UTC (History)
5 users (show)

See Also:
mi: maintainer-feedback+
jhb: merge-quarterly+

Do not insist on python-2, when building devel/gdb (389 bytes, patch)
2017-06-07 15:56 UTC, Mikhail T.
koobs: maintainer-approval+
koobs: maintainer-approval+
Details | Diff

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Description Mikhail T. 2017-06-07 15:56:09 UTC
Created attachment 183299 [details]
Do not insist on python-2, when building devel/gdb

There is no apparent need to insist on Python-2.x in lang/gdb any more... It certainly builds just fine now -- just tested with Python-3.6.1 (may work with 3.5 too?). There is a comment inside Python's Tools/gdb/libpython.py:

# NOTE: some gdbs are linked with Python 3, so this file should be dual-syntax
# compatible (2.6+ and 3.0+).  See #19308.

So we would not be the first ones doing it :-)
Comment 1 luca.pizzamiglio 2017-06-30 10:42:29 UTC
Hi Mikhail, thanks for nothing this.
I'll do some tests with python3
Comment 2 Kubilay Kocak freebsd_committer freebsd_triage 2017-07-03 10:42:40 UTC
Pending further maintainer feedback as per comment 2

@Mikhail #19308 doesn't appear to be a valid issue reference, please clarify which issue was intended (by adding it to See Also: field)
Comment 3 Mikhail Teterin freebsd_committer 2017-07-03 14:15:15 UTC
(In reply to Kubilay Kocak from comment #2)
> @Mikhail #19308 doesn't appear to be a valid issue reference
That was a verbatim comment from inside Python's Tools/gdb/libpython.py. I believe, the author was referring to the Python bug:


I don't know, if it needs to be referenced by this ticket formally, but, if it does, please, put it into the right field.
Comment 4 luca.pizzamiglio 2017-07-05 10:19:40 UTC
I've asked to merge this patch in the phabricator review, here:

This PR can be now closed.
Comment 5 Kubilay Kocak freebsd_committer freebsd_triage 2017-07-05 10:39:59 UTC
Reviews don't obsolete issues, issues referencing reviews are closed when the change is committed.

If the changes in the review are not the same as those referenced in the issue, please obsolete the attachment.

Having said that, I would recommend relaxing the python version be committed separately and BEFORE the gdb updates, so that the commit can be merged to the quarterlly branch.

Assign to committer proposing differential revision
Comment 6 John Baldwin freebsd_committer freebsd_triage 2017-07-05 18:26:26 UTC
I don't mind committing this specific change first before the 8.0 update.  However, I'm not a ports committer so I'd need a ports committer to approve it.  Also, I don't know if this needs a port revision bump?  I believe that the default python is still 2.7, so I don't think this will change any default package builds, so a revision bump is not warranted?
Comment 7 Kubilay Kocak freebsd_committer freebsd_triage 2017-07-07 04:23:14 UTC
(In reply to John Baldwin from comment #6)

Thank you, that would be great John. I can provide the ports/python approval. Note that the change also needs to be MFH'd to quarterly. I can assist/guide there if needed.

This issue is still pending necessary QA as per comment 1, anticipating:

- Confirmation of successful packaging (poudriere/testport) runs for devel/gdb with Python 3.6, 3.5 at least

- From a Python perspective it would be good to see/confirm run-time (debugging) function with at least Python 3.5, 3.6
Comment 8 John Baldwin freebsd_committer freebsd_triage 2017-07-07 19:58:34 UTC
I did builds (and testport) on 11-stable of gdb with DEFAULT_VERSIONS=python=3.5 and 3.6 and both built fine.  I also installed the gdb packages and simple python tests ('python \ print "foo" \ end' on the existing gdb with python2 and 'python \ print("foo") \ end' on the two gdb's built with 3.5 and 3.6) all worked ok.  Does this need any further review or is this ready for commit now?
Comment 9 luca.pizzamiglio 2017-07-08 07:33:02 UTC
(In reply to John Baldwin from comment #8)
I've also built it on 11.0 and 10.3, on i386 and amd64, with python 3.5 and 3.6.
I've also ran some easy tests and it looks like problem free.

I approve the commit.
Comment 10 John Baldwin freebsd_committer freebsd_triage 2017-07-08 14:56:54 UTC
I am curious if this really warrants an MFH though since the default python version for packages is python 2, so this change only affects packages built with a non-default make.conf.  Is it expected that users are regularly doing their own poudriere builds against quarterly branches or is the primary target pkg.freebsd.org packages for which this change is a no-op?
Comment 11 Kubilay Kocak freebsd_committer freebsd_triage 2017-07-09 16:38:36 UTC
(In reply to John Baldwin from comment #10)

Anything that isn't a feature change/addition should be merged, even if only to make future merges easier. This includes (but is not limited to) port fixes/improvements in addition to upstream software bug fixes. 

In this case, the context of the change is an incorrect (artificial) limitation on gdb being built with only 2.x versions of Python, limiting users, and is effectively a bug fix.
Comment 12 John Baldwin freebsd_committer freebsd_triage 2017-07-10 16:51:44 UTC
Hmm, that seems odd, but ok.  In src we use a whitelist to only merge things that are needed, not a blacklist of only not merging major changes.  Also, since the next change to this port is a major version bump (which is more major than most since it switches to C++11, etc.) it seems very unlikely that any future bugfix would be directly mergeable from the port to the quarterly branch anyway.
Comment 13 commit-hook freebsd_committer 2017-07-10 16:58:52 UTC
A commit references this bug:

Author: jhb
Date: Mon Jul 10 16:58:12 UTC 2017
New revision: 445441
URL: https://svnweb.freebsd.org/changeset/ports/445441

  Permit building GDB with python 3.

  The python support in GDB works with either python 2 or python 3.  There
  is no reason to restrict it to python 2 only.

  PR:		219844
  Submitted by:	mi
  Approved by:	luca.pizzamiglio@gmail.com (maintainer)
  MFH:		2017Q3

Comment 14 commit-hook freebsd_committer 2017-07-11 17:26:35 UTC
A commit references this bug:

Author: jhb
Date: Tue Jul 11 17:25:42 UTC 2017
New revision: 445538
URL: https://svnweb.freebsd.org/changeset/ports/445538

  MFH: r445441

  Permit building GDB with python 3.

  The python support in GDB works with either python 2 or python 3.  There
  is no reason to restrict it to python 2 only.

  PR:		219844
  Approved by:	ports-secteam (junovitch)

_U  branches/2017Q3/