OpenCL errors on exit

[pkienzle]

$ sascomp barbell
INFO:root:building barbell-float32 for OpenCL HD Graphics 4000
OCL32 t=348.29 ms, intensity=266902
INFO:root:building barbell-float64 for OpenCL Intel(R) Core(TM) i7-3520M CPU @ 2.90GHz
OCL64 t=275.28 ms, intensity=266902
|OCL32-OCL64|          max:1.228e-03  median:4.890e-04  98%:1.143e-03  rms:5.872e-04  zero-offset:+5.058e-04
|(OCL32-OCL64)/OCL64|  max:4.591e-07  median:2.552e-07  98%:4.398e-07  rms:2.754e-07  zero-offset:+2.555e-07
Exception AttributeError: "'NoneType' object has no attribute 'clobj__delete'" in <bound method _Program.__del__ of <pyopencl.cffi_cl._Program object at 0x103928590>> ignored
Exception AttributeError: "'NoneType' object has no attribute 'clobj__delete'" in <bound method _Program.__del__ of <pyopencl.cffi_cl._Program object at 0x103908b10>> ignored
Exception AttributeError: "'NoneType' object has no attribute 'clobj__delete'" in <bound method CommandQueue.__del__ of <pyopencl.cffi_cl.CommandQueue object at 0x1039037d0>> ignored
Exception AttributeError: "'NoneType' object has no attribute 'clobj__delete'" in  ignored
Exception AttributeError: "'NoneType' object has no attribute 'clobj__delete'" in <bound method CommandQueue.__del__ of <pyopencl.cffi_cl.CommandQueue object at 0x103903950>> ignored
Exception AttributeError: "'NoneType' object has no attribute 'clobj__delete'" in  ignored
Exception AttributeError: "'NoneType' object has no attribute 'clobj__delete'" in  ignored
Exception AttributeError: "'NoneType' object has no attribute 'clobj__delete'" in  ignored

[pkienzle]

Note: macbook pro OS 10.9.5

[pkienzle]

Reported on Debian

​https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=819448

Fails on OS X 10.9.5 with pyopencl 2016.1 and 2015.2.4, but not with 2015.1

[pkienzle]

Solution may be to hold the version at 2015.1 until a newer version works; document that this should be checked in the package dependency table (we have all the dependencies listed in one and only one place, right?).

[wojciech]

Currently we keep requirements in two places: check_packages.py and requirements.txt. I've added requirements for pyopencl 2015.1