Re: [Matplotlib-users] Build failure

[Ian T. <ian...@gm...>]

On 26 October 2013 09:02, Nils Wagner <ni...@go...> wrote:

> The problem persists in master.
>
>
>
> On Fri, Aug 30, 2013 at 7:39 PM, Nils Wagner <ni...@go...>wrote:
>
>> You are right.
>> The first one fails, the second works for me.
>>
>>
>> Nils
>>
>>
>>
>> On Fri, Aug 30, 2013 at 7:20 PM, Michael Droettboom <md...@st...>wrote:
>>
>>>  I wonder if it's commit 6b827cbf.
>>>
>>> Can you do:
>>>
>>>    git checkout 6b827cbf
>>>    python setup.py build
>>>    # confirm it fails
>>>
>>>    git checkout 6b827cbf^
>>>    python setup.py build
>>>    # Does this work?
>>>
>>> Mike
>>>
>>>
>>> On 08/30/2013 01:06 PM, Nils Wagner wrote:
>>>
>>> Hi Michael,
>>>
>>> Thank you for your note.
>>> If I remember correctly I was able to build matplotlib a week ago.
>>> I am using opensuse12.3
>>>
>>> Nils
>>>
>>> rpm -qi python-cxx
>>> Name        : python-cxx
>>> Version     : 6.2.3
>>> Release     : 2.2
>>> Architecture: noarch
>>> Install Date: Sa 27 Jul 2013 15:48:45 CEST
>>> Group       : Development/Languages/Python
>>> Size        : 9783
>>> License     : GPL
>>> Signature   : RSA/SHA1, Mo 22 Jul 2013 20:26:22 CEST, Key ID
>>> 45a1d0671abd1afb
>>> Source RPM  : python-cxx-6.2.3-2.2.src.rpm
>>> Build Date  : Mo 22 Jul 2013 15:27:08 CEST
>>> Build Host  : swkj07
>>> Relocations : (not relocatable)
>>> Packager    : pa...@li...
>>> Vendor      : http://packman.links2linux.de
>>> URL         : http://CXX.sourceforge.net/
>>> Summary     : Write Python extensions in C++
>>> Description :
>>> PyCXX is a set of classes to help create extensions of Python in the C
>>> language. The first part encapsulates the Python C API taking care of
>>> exceptions and ref counting. The second part supports the building of
>>> Python
>>> extension modules in C++.
>>> Distribution: Extra / openSUSE_12.3
>>>
>>>
>>>
>>> On Fri, Aug 30, 2013 at 6:46 PM, Michael Droettboom <md...@st...>wrote:
>>>
>>>>  It looks like a version mismatch with PyCXX.  Was it recently updated
>>>> or changed?  What version of PyCXX do you have?  What was the last version
>>>> of matplotlib that worked for you?
>>>>
>>>> You can force matplotlib to use its local copy of PyCXX by uninstalling
>>>> PyCXX, or adding the following lines to the top of PyCXX::check in
>>>> setupext.py:
>>>>
>>>>         self.__class__.found_external = False
>>>>         return "Couldn't import.  Using local copy."
>>>>
>>>> (But really, we should update setupext so users can specify the local
>>>> override in setup.cfg).
>>>>
>>>> Mike
>>>>
>>>>
>>>> On 08/30/2013 12:35 PM, Nils Wagner wrote:
>>>>
>>>>   Hi all,
>>>>
>>>>  I cannot build the latest matplotlib from git. The build log is
>>>> attached.
>>>>
>>>>  Nils
>>>>
>>>> I have had a quick look at this and it seems the problem lies in
setupext.py.  CXX.check() contains

          return self._check_for_pkg_config('PyCXX', 'CXX/Extensions.hxx',
min_version='6.2.4')

which requires version 6.2.4 or later of CXX.  Nils has 6.2.3 and so this
check should fail and matplotlib should fall back to using the local copy
of CXX.  SetupPackage._check_for_pkg_config() does check min_version if CXX
is installed using pkg-config, but if it is not then min_version is ignored
as the function raises a CheckFailed error before min_version is
considered.  CXX.check() catches this error and uses the system-installed
CXX regardless of its version.

To check the CXX version we probably need to look in CXX/Version.hxx.  I am
not sure how to proceed; do you have any ideas Mike?

Nils, as a stopgap you could either remove your python-cxx and
python-cxx-devel rpms if you don't need them for anything else, or upgrade
them to 6.2.4.  There is a 6.2.4 on rpm.pbone.net even though there isn't
one on packman.links2linux.de.

Ian