[ python-Bugs-1689617 ] Intel icc build fails with optimizations -O2

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Bugs item #1689617, was opened at 2007-03-28 04:26
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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"



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