Re: Python 3.6 can find cairo libs but not Python 2.7
D'Arcy Cain wrote: > On 2018-07-13 10:28 AM, Peter Otten wrote: >> As far as I can see -- without having access to a netbsd machine -- this > > Would it help if I gave you a login on one? Sorry, no. > Interestingly, I don't have this issue on my NetBSD machine built from > HEAD. Maybe it is something that was fixed but not pulled up to 7. > > More weirdness - I do have the issue on my HEAD system but only with > 3.7. I can give you an account on that server as well. If you have a working 3.6 and a 3.7 that does not work the code in ctypes.util might be similar enough that you can spot suspicious changes in the diff between the two versions. -- https://mail.python.org/mailman/listinfo/python-list
Re: Python 3.6 can find cairo libs but not Python 2.7
On 2018-07-13 10:28 AM, Peter Otten wrote: > As far as I can see -- without having access to a netbsd machine -- this Would it help if I gave you a login on one? Interestingly, I don't have this issue on my NetBSD machine built from HEAD. Maybe it is something that was fixed but not pulled up to 7. More weirdness - I do have the issue on my HEAD system but only with 3.7. I can give you an account on that server as well. -- D'Arcy J.M. Cain Vybe Networks Inc. http://www.VybeNetworks.com/ IM:da...@vex.net VoIP: sip:da...@vybenetworks.com -- https://mail.python.org/mailman/listinfo/python-list
Re: Python 3.6 can find cairo libs but not Python 2.7
D'Arcy Cain wrote:
> On 2018-07-13 08:05 AM, Peter Otten wrote:
>> D'Arcy Cain wrote:
>>> Nope. Both are 64 bit.
>>
>> Just to be 100% sure, what does
>>
>> $ python2.7 -c 'import struct; print(struct.calcsize("l"))'
>>
>> $ python3.6 -c 'import struct; print(struct.calcsize("l"))'
>>
>> print?
>
> $ python2.7 -c 'import struct; print(struct.calcsize("l"))'
> 8
> $ python3.6 -c 'import struct; print(struct.calcsize("l"))'
> 8
>
>> If both print 8, what is sys.platform? (This is just that I can look at
>> the right branch of the ctypes.util source for differences)?
>
> $ python2.7 -c 'import sys; print(sys.platform)'
> netbsd7
> $ python3.6 -c 'import sys; print(sys.platform)'
> netbsd7
>
> Thanks for checking this.
As far as I can see -- without having access to a netbsd machine -- this
leads to the standard 'posix' implementation of find_library() which in both
Python 2 and 3 runs /sbin/ldconfig and then searches its output with a
regex.
On my (linux) machine that regex is the same for both python 2.7 and 3.6:
$ python3.6 -c 'import sys; sys.platform="netbsd7"; from ctypes import util;
print(util.find_library("cairo"))'
XXX b'\\s+(libcairo\\.[^\\s]+)\\s+\\(libc6,x86-64'
libcairo.so.2
$ python2.7 -c 'import sys; sys.platform="netbsd7"; from ctypes import util;
print(util.find_library("cairo"))'
YYY '\\s+(libcairo\\.[^\\s]+)\\s+\\(libc6,x86-64'
libcairo.so.2
Given the implementation
def find_library(name):
return _findSoname_ldconfig(name) or
_get_soname(_findLib_gcc(name))
you might try calling _findSoname_ldconfig() directly -- if it fails for
both 2.7 and 3.6 the next step would be to have a look at the fallback.
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Re: Python 3.6 can find cairo libs but not Python 2.7
On 2018-07-13 08:05 AM, Peter Otten wrote:
> D'Arcy Cain wrote:
>> Nope. Both are 64 bit.
>
> Just to be 100% sure, what does
>
> $ python2.7 -c 'import struct; print(struct.calcsize("l"))'
>
> $ python3.6 -c 'import struct; print(struct.calcsize("l"))'
>
> print?
$ python2.7 -c 'import struct; print(struct.calcsize("l"))'
8
$ python3.6 -c 'import struct; print(struct.calcsize("l"))'
8
> If both print 8, what is sys.platform? (This is just that I can look at the
> right branch of the ctypes.util source for differences)?
$ python2.7 -c 'import sys; print(sys.platform)'
netbsd7
$ python3.6 -c 'import sys; print(sys.platform)'
netbsd7
Thanks for checking this.
--
D'Arcy J.M. Cain
Vybe Networks Inc.
http://www.VybeNetworks.com/
IM:da...@vex.net VoIP: sip:da...@vybenetworks.com
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Re: Python 3.6 can find cairo libs but not Python 2.7
D'Arcy Cain wrote:
> On 2018-07-12 07:41 PM, Peter Otten wrote:
>> Wild guess: one Python is 64 bit and the other is 32 bit, and you have
>> only one version of the library installed.
>
> Nope. Both are 64 bit.
Just to be 100% sure, what does
$ python2.7 -c 'import struct; print(struct.calcsize("l"))'
$ python3.6 -c 'import struct; print(struct.calcsize("l"))'
print?
If both print 8, what is sys.platform? (This is just that I can look at the
right branch of the ctypes.util source for differences)?
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Re: Python 3.6 can find cairo libs but not Python 2.7
On 2018-07-12 07:41 PM, Peter Otten wrote: > Wild guess: one Python is 64 bit and the other is 32 bit, and you have only > one version of the library installed. Nope. Both are 64 bit. -- D'Arcy J.M. Cain Vybe Networks Inc. http://www.VybeNetworks.com/ IM:da...@vex.net VoIP: sip:da...@vybenetworks.com -- https://mail.python.org/mailman/listinfo/python-list
Re: Python 3.6 can find cairo libs but not Python 2.7
On 2018-07-12 04:17 PM, Terry Reedy wrote:
> On 7/12/2018 3:52 PM, D'Arcy Cain wrote:
>> $ python2.7 -c "import ctypes.util;
>> print(ctypes.util.find_library('cairo'))"
>> libcairo.so.2
>> $ python3.6 -c "import ctypes.util;
>> print(ctypes.util.find_library('cairo'))"
>> None
>>
>> I have the 3.6 version of py-cairo installed. Any thoughts?
>>
>> NetBSD 7.1.2
>
> what is sys.path? Where in py-cairo installed?
For 3.6 it includes '/usr/pkg/lib/python3.6/site-packages' and for 2.7
it includes '/usr/pkg/lib/python2.7/site-packages'. The py-cairo files
are in the 3.6 site-packages. There are no Cairo files in the 2.7
Python directory.
I'm not sure why that matters though. It's the system libraries that it
can't find unless having py-cairo installed is somehow blocking the
search for the libraries.
Of course, my actual use depends on a cairo package. In fact, the
failure that led me to the above issue happens when I load cairocffi.
$ python3.6 -c "import cairocffi"
Traceback (most recent call last):
File "", line 1, in
File "/usr/pkg/lib/python3.6/site-packages/cairocffi/__init__.py",
line 41, in
cairo = dlopen(ffi, 'cairo', 'cairo-2')
File "/usr/pkg/lib/python3.6/site-packages/cairocffi/__init__.py",
line 38, in dlopen
raise OSError("dlopen() failed to load a library: %s" % ' /
'.join(names))
OSError: dlopen() failed to load a library: cairo / cairo-2
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D'Arcy J.M. Cain
Vybe Networks Inc.
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Re: Python 3.6 can find cairo libs but not Python 2.7
D'Arcy Cain wrote:
> $ python2.7 -c "import ctypes.util;
> print(ctypes.util.find_library('cairo'))"
> libcairo.so.2
> $ python3.6 -c "import ctypes.util;
> print(ctypes.util.find_library('cairo'))"
> None
>
> I have the 3.6 version of py-cairo installed. Any thoughts?
>
> NetBSD 7.1.2
Wild guess: one Python is 64 bit and the other is 32 bit, and you have only
one version of the library installed.
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Re: Python 3.6 can find cairo libs but not Python 2.7
On 7/12/2018 3:52 PM, D'Arcy Cain wrote:
$ python2.7 -c "import ctypes.util;
print(ctypes.util.find_library('cairo'))"
libcairo.so.2
$ python3.6 -c "import ctypes.util;
print(ctypes.util.find_library('cairo'))"
None
I have the 3.6 version of py-cairo installed. Any thoughts?
NetBSD 7.1.2
what is sys.path? Where in py-cairo installed?
--
Terry Jan Reedy
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Python 3.6 can find cairo libs but not Python 2.7
$ python2.7 -c "import ctypes.util;
print(ctypes.util.find_library('cairo'))"
libcairo.so.2
$ python3.6 -c "import ctypes.util;
print(ctypes.util.find_library('cairo'))"
None
I have the 3.6 version of py-cairo installed. Any thoughts?
NetBSD 7.1.2
Cheers.
--
D'Arcy J.M. Cain
System Administrator, Vex.Net
http://www.Vex.Net/ IM:da...@vex.net
VoIP: sip:da...@vex.net
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