Mark Dickinson <dicki...@gmail.com> added the comment:

Final patch.

Skip, could you please give this one a try, and then with any luck this 
can be fixed for 3.0.1.  (Sorry for creating more work;  this should be 
the last time.)

I've added a configure test that detects x87 FPU usage, via the double 
rounding issue associated with the x87.  If x87 is detected then 
_Py_force_double is used via a macro Py_FORCE_DOUBLE;  otherwise, 
Py_FORCE_DOUBLE does nothing.

When you configure on a machine that uses x87, you should see:

checking for x87-style double rounding... yes

in the configure output.

Added file: http://bugs.python.org/file12432/force_to_memory5.patch

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