Bugs item #1689617, was opened at 2007-03-28 04:26
Message generated for change (Comment added) made by mforbes
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Category: Build
Group: Python 2.5
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Michael Forbes (mforbes)
Assigned to: Nobody/Anonymous (nobody)
Summary: Intel icc build fails with optimizations -O2
Initial Comment:
When building python 2.5 with the free Intel compilers for non-commercial use
(icc), the build works without optimizations, but fails when optimizations -O2
and -O3 are used.
The compilation proceedes without errors (though there are lot's of warnings
and remarks) and makes a python executable, but when the python setup starts,
the intepreter cannot import certain packages and cannot add two strings.
case $MAKEFLAGS in \
*-s*) CC='icc -pthread' LDSHARED='icc -pthread -shared' OPT='-DNDEBUG -g -O2
-Ob2 -w1' ./python -E ./setup.py -q build;; \
*) CC='icc -pthread' LDSHARED='icc -pthread -shared' OPT='-DNDEBUG -g -O2 -Ob2
-w1' ./python -E ./setup.py build;; \
esac
'import site' failed; use -v for traceback
Traceback (most recent call last):
File "./setup.py", line 6, in <module>
import sys, os, imp, re, optparse
File "/int/apps/mmf/src/Python-2.5_intel/Lib/optparse.py", line 71, in
<module>
import textwrap
File "/int/apps/mmf/src/Python-2.5_intel/Lib/textwrap.py", line 10, in
<module>
import string, re
File "/int/apps/mmf/src/Python-2.5_intel/Lib/string.py", line 26, in <module>
letters = lowercase + uppercase
SystemError: error return without exception set
make: *** [sharedmods] Error 1
For example:
$ ./python
'import site' failed; use -v for traceback
Python 2.5 (r25:51908, Mar 27 2007, 20:10:22)
[GCC Intel(R) C++ gcc 3.4 mode] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> a = "123"
>>> a + "12"
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
SystemError: error return without exception set
>>>
Note that both the import of the site file fails and the addition fails.
Python was configured with the following options:
./configure --with-gcc=icc\
--with-cxx-main=icc\
--prefix=/int/apps/mmf/apps/Python-2.5_intel/\
OPT="-g -O2 -Ob2 -w1"
----------------------------
When compiled with fewer optimiztions, everything seems to work.
./configure --with-gcc=icc\
--with-cxx-main=icc\
--prefix=/int/apps/mmf/apps/Python-2.5_intel/\
OPT="-g -O1 -Ob2 -w1"
----------------------------------------------------------------------
>Comment By: Michael Forbes (mforbes)
Date: 2007-03-31 20:31
Message:
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user_id=253921
Originator: YES
It does not appear to be a problem with aliasing (icc accepts the
-fno-strict-aliasing flag and it is set by default using ./configure. It
is another question of whether or not icc behaves this flag!).
This looks similar to a previous problem but I am not using any processor
specific optimizations:
http://mail.python.org/pipermail/python-list/2005-March/312145.html
----------------------------------------------------------------------
Comment By: Neal Norwitz (nnorwitz)
Date: 2007-03-31 19:56
Message:
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My guess is that it relates to strict aliasing (which Python violates).
Can you find the equivalent flag to gcc's -fno-strict-aliasing in icc?
----------------------------------------------------------------------
Comment By: Michael Forbes (mforbes)
Date: 2007-03-29 22:06
Message:
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I have spoken with some people who have had similar issues with the intel
compilers in other applications, so it looks like it might be a compiler
bug. I will look into this.
Can anyone confirm this behaviour? (I only have access to one linux box).
----------------------------------------------------------------------
Comment By: Martin v. Löwis (loewis)
Date: 2007-03-28 11:32
Message:
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Can you debug this further to determine a specific problem? It could be a
compiler bug also, for all I can tell.
----------------------------------------------------------------------
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