[ python-Bugs-678265 ] test_coercion fails on AIX

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Bugs item #678265, was opened at 2003-01-31 18:10
Message generated for change (Comment added) made by nascheme
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Category: Python Interpreter Core
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Neal Norwitz (nnorwitz)
Assigned to: Nobody/Anonymous (nobody)
Summary: test_coercion fails on AIX

Initial Comment:
Tim, I assigned this to you to see if you had any 
insight/ideas about this problem.

test_coercion fails on AIX.  All the failures are due to the 
test expecting n+0j, but the output is n-0j.

Here's an example:

- <MethodNumber 1> / (2+0j) = (0.5+0j)
?                                 ^
+ <MethodNumber 1> / (2+0j) = (0.5-0j)
?                                 ^

I have another compiler, so I&#039;ll probably try that.  
Especially since it&#039;s gcc. :-)

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>Comment By: Neil Schemenauer (nascheme)
Date: 2004-03-09 23:22

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I really didn't intend for test_coercion to become a
platform fp quirks test.  The attached patch changes the
test to format floating point
numbers to one decimal place.


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Comment By: Mark D. Roth (mdr0)
Date: 2004-03-09 21:35

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I've run into this same problem under AIX 4.3.3 with IBM
compiler version 6.0.0.5 and under AIX 5.1 with IBM compiler
version 6.0.0.4.

Is there a work-around, other than building with gcc?


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Comment By: Tim Peters (tim_one)
Date: 2003-01-31 21:08

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You really need a platform wizard for something like this.  If 
there are any compiler options with descriptions 
like "generate IEEE-754 compatible code" (or "stricter 754 
xyz"), or "disable generation of fused multiply-add", they 
would be relevant.

OTOH, Python promises nothing about how the sign bit of a 
floating zero behaves, so it would be OK by me if the test 
were changed not to produce complex results with zero 
imaginary members.

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Comment By: Neal Norwitz (nnorwitz)
Date: 2003-01-31 19:26

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The test passes with gcc 3.2.  The C compiler is in vac.C 
version 4.4.0.3 (lslpp -l vac.C).

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