Running into troubles Building a MinGW compiler using Cygwin

Running into troubles Building a MinGW compiler using Cygwin

[kelley.r.cook]

I'm running into a bit of a snag attempting to build a MingW GCC 3.1 compiler
using cygwin.  And I think I may have found a problem with the configure script.

As I understand it, it is a two part process.

First I had to build and install the cygwin-x-mingw toolchain and compilier,
making sure to copy MingW's include files and librarys into the build paths.

I think that I accompished this step without much difficulty.  They are now in
my path and named i686-pc-mingw-{gcc,ld,as,ranlib ...}

Now I needed to run configure with the following options:

./src/configure --host=i686-pc-mingw32 --target=i686-pc-mingw32
--build=i686-pc-cygwin --disable-nls --enable-prefix=/cygdrive/c/mingw/local

make all install

Something that I am noticed is that when it scrolls through all of the configure
steps it repeatedly says:
---
checking whether the C compiler i686-pc-mingw32-gcc -g -O2 works... yes
checking whether the C compiler i686-pc-mingw32-gcc -g -O2 is a
cross-compiler... no
---
Except that, of course, it is a cross-compiler.  Now maybe this doesn't actually
matter, but it still seems to be incorrect.

Glancing through the configure script, I think it comes from the following
fragment.

----
if { (eval echo configure:1234: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } &&
test -s conftest${ac_exeext}; then
  ac_cv_prog_cc_works=yes
  # If we can't run a trivial program, we are probably using a cross compiler.
  if (./conftest; exit) 2>/dev/null; then
    ac_cv_prog_cc_cross=no
  else
    ac_cv_prog_cc_cross=yes
  fi
else
  echo "configure: failed program was:" >&5
  cat conftest.$ac_ext >&5
  ac_cv_prog_cc_works=no
fi
rm -fr conftest*
----

This doesn't work in this instance since under the cygwin environment you can
run any ordinary win32 program (which mingw creates) therefore the ./conftest
executes and the test fails.

My questions are:

a) Am I way off-base in my deductions?
b) Is there an easy way to fix this test?  (checking for build !=host might
work)
c) Barring that, is there a way to override the test and tell configure that
i686-pc-mingw32 is a cross-compiler?

Or should I just ignore it, since the cross-compile flag doesn't actually matter
and the reason why libstdc++-v3 dies with "configure: error: unable to detect
exception model" is for a completely different reason.

--
Kelley Cook