Building natively on win32 with mingw32/Cygwin

Hello,

I've recently submitted a patch to the pgsql-patches list that adds Makefiles
for building libpq (and potentially more parts, but I only cared about libpq)
with mingw32. The current state on win32 is that only proprietary Makefiles for
M$ Visual C++ are supported.

The powers that be have stated that they'd prefer to integrate the native
mingw32 build into the existing autoconf-based build process.

I'd like to tackle only the minimum for now: building a native win32 libpq with
Cygwin's mingw32 mode ("-mno-cygwin").

My problem is that I have next to zero experience with the autoconf toolset.
I'd very much appreciate any help you can give me here.

Problem #1: How should it work?
===============================

With which options to configure should the native compilation work? What's the
standard way to get this to work? I assumed "./configure --target=i386-mingw32"
should be all that is necessary. I assume the configure script must then do all
the rest like:

- determine the host system
- determine the executable name of gcc
- determine the options to pass to gcc ("-mno-cygwin")

Or is there more to it? Setting additional variables?

Problem #2 is how to get this to work. But first I need to know for which
things to trigger in the configure stuff.

Thanks,

Gerhard
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