Re: [gentoo-science] [sage-on-gentoo](python-2.6.5-r99)

[François Bissey]

> To those using amd64:
>
> I first encountered the following when revising sage-core-4.3.5-r1 to
> allow backporting from sage-4.4.2 to sage-4.3.5 and it appears with
> sage-4.4.2. If I upgrade python to 2.6.5-r99 and rebuild sage-core,
> sage will not start. I get:
>
> ImportError                               Traceback (most recent call
> last)
>
> /usr/lib64/python2.6/site-packages/IPython/ipmaker.pyc in
> force_import(modname, force_reloa
> d)
>       61         reload(sys.modules[modname])
>       62     else:
> ---> 63         __import__(modname)
>       64
>       65
>
> /opt/sage/local/bin/ipy_profile_sage.py in <module>()
>        5     preparser(True)
>        6
> ----> 7     import sage.all_cmdline
>        8     sage.all_cmdline._init_cmdline(globals())
>        9
>
> /usr/lib64/python2.6/site-packages/sage/all_cmdline.py in <module>()
>       12 try:
>       13
> ---> 14     from sage.all import *
>       15     from sage.calculus.predefined import x
>       16     preparser(on=True)
>
> /usr/lib64/python2.6/site-packages/sage/all.py in <module>()
>       70 get_sigs()
>       71
> ---> 72 from sage.rings.all      import *
>       73 from sage.matrix.all     import *
>       74
>
> /usr/lib64/python2.6/site-packages/sage/rings/all.py in <module>()
>       92
>       93 # Algebraic numbers
> ---> 94 from qqbar import (AlgebraicRealField, is_AlgebraicRealField,
> AA,
>       95                    AlgebraicReal, is_AlgebraicReal,
>       96                    AlgebraicField, is_AlgebraicField, QQbar,
>
> /usr/lib64/python2.6/site-packages/sage/rings/qqbar.py in <module>()
>     1414 QQy = QQ['y']
>     1415 QQy_y = QQy.gen()
> -> 1416 QQxy = QQ['x', 'y']
>     1417 QQxy_x = QQxy.gen(0)
>     1418 QQxy_y = QQxy.gen(1)
>
> /usr/lib64/python2.6/site-packages/sage/rings/ring.so in
> sage.rings.ring.Ring.__getitem__ (
> sage/rings/ring.c:2711)()
>      203
>      204
> --> 205
>      206
>      207
>
> /usr/lib64/python2.6/site-packages/sage/rings/polynomial/polynomial_ring_co
> nstructor.py in
> PolynomialRing(base_ring, arg1, arg2, sparse, order, names, name,
> implementation)
>      353             names = arg1
>      354             n = len(names)
> --> 355             R = _multi_variate(base_ring, names, n, sparse,
> order)
>      356
>      357     if arg1 is None and arg2 is None:
>
> /usr/lib64/python2.6/site-packages/sage/rings/polynomial/polynomial_ring_co
> nstructor.py in
> _multi_variate(base_ring, names, n, sparse, order)
>      451         return R
>      452
> --> 453     from sage.rings.polynomial.multi_polynomial_libsingular
> import MPolynomialRing_
> libsingular
>      454     if m.integral_domain.is_IntegralDomain(base_ring):
>      455         if n < 1:
>
> ImportError:
> /usr/lib64/python2.6/site-packages/sage/rings/polynomial/multi_polynomial_l
> ibs ingular.so: undefined symbol: _Z7_p_TestP8spolyrecP9sip_sringi
> Error importing ipy_profile_sage - perhaps you should run %upgrade?
> WARNING: Loading of ipy_profile_sage failed.
>
> and if I re-emerge sage I get:
>
> Setting permissions of DOT_SAGE directory so only you can read and
> write it.
> Traceback (most recent call last):
>    File "/opt/sage/local/bin/sage-eval", line 4, in <module>
>      from sage.all import *
>    File "/usr/lib64/python2.6/site-packages/sage/all.py", line 72, in
> <module>
>      from sage.rings.all      import *
>    File "/usr/lib64/python2.6/site-packages/sage/rings/all.py", line
> 90, in <module>
>      from qqbar import (AlgebraicRealField, is_AlgebraicRealField, AA,
>    File "/usr/lib64/python2.6/site-packages/sage/rings/qqbar.py", line
> 1412, in <modul
> e>
>      QQxy = QQ['x', 'y']
>    File "ring.pyx", line 205, in sage.rings.ring.Ring.__getitem__
> (sage/rings/ring.c:2
> 550)
>    File
> "/usr/lib64/python2.6/site-packages/sage/rings/polynomial/polynomial_ring_c
> ons tructor.py", line 355, in PolynomialRing
>      R = _multi_variate(base_ring, names, n, sparse, order)
>    File
> "/usr/lib64/python2.6/site-packages/sage/rings/polynomial/polynomial_ring_c
> ons tructor.py", line 453, in _multi_variate
>      from sage.rings.polynomial.multi_polynomial_libsingular import
> MPolynomialRing_li
> bsingular
> ImportError:
> /usr/lib64/python2.6/site-packages/sage/rings/polynomial/multi_polynomia
> l_libsingular.so: undefined symbol: _Z7_p_TestP8spolyrecP9sip_sringi
>
>
> I could have overlooked something. I rebuilt cython with no effect.
> This is somewhat similar to a problem that was solved by appending
> "-fno-strict-aliasing" to the flags in sage-core; which is still there.
> None of this is present with python-2.6.4-r99.
>
Hi Steve,

I hit that myself a few hours ago with 4.4.2 on ppc.
Not quite sure what to do about it yet. Python-2.6.5-r2 has gone stable on ppc
and it is coming very fast to other arch so we better find what happens.
I probably need to do one more syncing with 2.6.5-r2 but I don't think that's 
related.

Francois