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I'm a bit confused by the question. On my computer, I
installed the current Microsoft compiler (7.0), compiled
Python, installed distutils with my patch, and built several
extensions. So distutils did use the same compiler as was
used to build Python.

If you want to use the same compiler that someone else built
Python with, then you'll need to get the same compiler they
used, to make sure it's the only version that's installed,
and distutils works fine.

Perhaps you mean that there is some way to determine which
compiler was used by Python from examining something in
Python itself. If this is possible, please let me know how
to do it. In this case I'd propose modifying the patch to
write out of warning when a different compiler was used to
run distutils than was used to compile Python. In the case
of the Microsoft compiler not all versions have been
incompatible.

Or perhaps you mean distutils should have a generalized way
to specify which version of compiler to use when more than
one is installed on your computer.