#11226: Sympow spkg fails with gcc 4.6.0
------------------------+---------------------------------------------------
Reporter: jdemeyer | Owner: mariah
Type: defect | Status: needs_review
Priority: major | Milestone: sage-4.7.1
Component: packages | Keywords: sympow
Work_issues: | Upstream: Reported upstream. Little or no
feedback.
Reviewer: | Author: Mariah Lenox
Merged: | Dependencies:
------------------------+---------------------------------------------------
Changes (by newvalueoldvalue):
* status: new => needs_review
* upstream: N/A => Reported upstream. Little or no feedback.
* author: => Mariah Lenox
Old description:
> On Linux Itanium (ia64) systems, sympow builds with gcc 4.6.0 but fails
> doctests.
> Example from cleo (RHEL 5.3 ia64 Itanium 2):
> {{{
> sage -t -long -force_lib devel/sage/sage/lfunctions/sympow.py
> **********************************************************************
> File
> "/home/buildbot/build/sage/cleo-1/cleo_full/build/sage-4.7.alpha5/devel
> /sage-main/sage/lfunctions/sympow.py", line 213:
> sage: sympow.modular_degree(EllipticCurve('11a'))
> Exception raised:
> Traceback (most recent call last):
> File
> "/home/buildbot/build/sage/cleo-1/cleo_full/build/sage-4.7.alpha5/local/bin/ncadoctest.py",
> line 1231, in run_one_test
> self.run_one_example(test, example, filename, compileflags)
> File
> "/home/buildbot/build/sage/cleo-1/cleo_full/build/sage-4.7.alpha5/local/bin/sagedoctest.py",
> line 38, in run_one_example
> OrigDocTestRunner.run_one_example(self, test, example, filename,
> compileflags)
> File
> "/home/buildbot/build/sage/cleo-1/cleo_full/build/sage-4.7.alpha5/local/bin/ncadoctest.py",
> line 1172, in run_one_example
> compileflags, 1) in test.globs
> File "<doctest __main__.example_6[2]>", line 1, in <module>
> sympow.modular_degree(EllipticCurve('11a'))###line 213:
> sage: sympow.modular_degree(EllipticCurve('11a'))
> File
> "/home/buildbot/build/sage/cleo-1/cleo_full/build/sage-4.7.alpha5/local/lib/python
> /site-packages/sage/lfunctions/sympow.py", line 229, in modular_degree
> raise RuntimeError, "failed to compute modular degree"
> RuntimeError: failed to compute modular degree
> **********************************************************************
>
> [...]
>
> The following tests failed:
>
> sage -t -long -force_lib
> devel/sage/sage/modular/hecke/submodule.py # 1 doctests failed
> sage -t -long -force_lib devel/sage/sage/modular/abvar/abvar.py
> # 1 doctests failed
> sage -t -long -force_lib devel/sage/sage/lfunctions/sympow.py #
> 13 doctests failed
> sage -t -long -force_lib
> devel/sage/sage/schemes/elliptic_curves/ell_rational_field.py # 17
> doctests failed
> ----------------------------------------------------------------------
> }}}
>
> Starting up the `sympow` executable simply gives
> {{{
> sympow 1.018 RELEASE (c) Mark Watkins -**ERROR** QD_check failed at x[0]
> }}}
>
> For other issues related to gcc 4.6.0 see #11216
New description:
On Linux Itanium (ia64) systems, sympow builds with gcc 4.6.0 but fails
doctests.
Example from cleo (RHEL 5.3 ia64 Itanium 2):
{{{
sage -t -long -force_lib devel/sage/sage/lfunctions/sympow.py
**********************************************************************
File
"/home/buildbot/build/sage/cleo-1/cleo_full/build/sage-4.7.alpha5/devel
/sage-main/sage/lfunctions/sympow.py", line 213:
sage: sympow.modular_degree(EllipticCurve('11a'))
Exception raised:
Traceback (most recent call last):
File
"/home/buildbot/build/sage/cleo-1/cleo_full/build/sage-4.7.alpha5/local/bin/ncadoctest.py",
line 1231, in run_one_test
self.run_one_example(test, example, filename, compileflags)
File
"/home/buildbot/build/sage/cleo-1/cleo_full/build/sage-4.7.alpha5/local/bin/sagedoctest.py",
line 38, in run_one_example
OrigDocTestRunner.run_one_example(self, test, example, filename,
compileflags)
File
"/home/buildbot/build/sage/cleo-1/cleo_full/build/sage-4.7.alpha5/local/bin/ncadoctest.py",
line 1172, in run_one_example
compileflags, 1) in test.globs
File "<doctest __main__.example_6[2]>", line 1, in <module>
sympow.modular_degree(EllipticCurve('11a'))###line 213:
sage: sympow.modular_degree(EllipticCurve('11a'))
File
"/home/buildbot/build/sage/cleo-1/cleo_full/build/sage-4.7.alpha5/local/lib/python
/site-packages/sage/lfunctions/sympow.py", line 229, in modular_degree
raise RuntimeError, "failed to compute modular degree"
RuntimeError: failed to compute modular degree
**********************************************************************
[...]
The following tests failed:
sage -t -long -force_lib
devel/sage/sage/modular/hecke/submodule.py # 1 doctests failed
sage -t -long -force_lib devel/sage/sage/modular/abvar/abvar.py #
1 doctests failed
sage -t -long -force_lib devel/sage/sage/lfunctions/sympow.py #
13 doctests failed
sage -t -long -force_lib
devel/sage/sage/schemes/elliptic_curves/ell_rational_field.py # 17
doctests failed
----------------------------------------------------------------------
}}}
Starting up the `sympow` executable simply gives
{{{
sympow 1.018 RELEASE (c) Mark Watkins -**ERROR** QD_check failed at x[0]
}}}
A revised package, which works around the gcc-4.6.0 bug by compiling QD.c
with -O1 is
[http://boxen.math.washington.edu/home/mariah/spkg/sympow-1.018.1.p9.spkg]
For other issues related to gcc 4.6.0 see #11216
--
Comment:
gcc-4.6.0 optimization regression of src/QD.c reported to gcc bugzilla
[http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48823]
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11226#comment:11>
Sage <http://www.sagemath.org>
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