New submission from Samuel Iseli :
We are using python as an embedded scripting environment in our ERP-product.
Since upgrading to python2.7 we have serious issues with floats:
>>> 28710.0
'2870:.0'
>>> round(28710.0)
2870.0
We are embedding Python in a Delphi-a
Samuel Iseli added the comment:
Hi Marc, the changes to the pythoncore.vcproj Visual-Studio file define the
HAVE_VC_FUNC_FOR_X87 symbol. I use this symbol to enable the precision-setting
macros in pyport.h. I made this similar to the existing code for gcc (linux).
You can change this but
Samuel Iseli added the comment:
I would definitely classify this as a bug in Python 2.7 as it breaks
backwards-compatibility for embedding environments that default to 64bit FPU
precision (e.g. Delphi).
Additionally the bug is very hard to detect and leads to wrong values with
possibly
Samuel Iseli added the comment:
There's an excess space after a line continuation backslash in my last patch,
so it doesn't compile (pyport.h, line 567).
Here's an additional patch that removes the space.
Didn't find out how to combine the 2 revisions in one patch-file.
Samuel Iseli added the comment:
I can run the tests on 32bit. Would be nice if somebody else could do this on
64bit (my VS2008 machine is currently on 32bit-Windows).
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Python tracker
<http://bugs.python.org/issue13
Samuel Iseli added the comment:
Completed the patch by adding the rounding-control bits to the mask (_MCW_RC)
and making sure the macros only get defined for MS-VC compiler (#ifdef
_MSC_VER).
Ran the tests (python_d -m test.autotest) on win32. Seems OK. The tests that
were skipped or failed
