Add a small script to cross-compile a Win32 binary under Unix.

git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@1174 81a1dc3b-b13d-400b-aceb-764788c761c2

tools/build-mingw32.sh

@@ -0,0 +1,45 @@
+#! /bin/sh
+
+# ----------------------------------------------------------------------------
+# "THE BEER-WARE LICENSE" (Revision 42):
+# Joerg Wunsch wrote this file.  As long as you retain this notice you
+# can do whatever you want with this stuff. If we meet some day, and you think
+# this stuff is worth it, you can buy me a beer in return.
+# ----------------------------------------------------------------------------
+
+# Script to cross-compile a MinGW32 executable under unixish host.
+# Run this script from within the tools/ subdirectory.
+# Override MINGW32_PREFIX and LIBUSB_PREFIX from the commandline
+# when invoking the script, like
+#
+# env LIBUSB_PREFIX="$HOME/dos/ProgramFiles/LibUSB-Win32" ./build-mingw32.sh
+#
+# The LibUSB-Win32 package is shipped as a self-installing
+# executable; it can be unpacked using Wine, and typically
+# extracts into the Wine environment.
+#
+# libelf can be cross-compiled, and installed into the MinGW32
+# target environment if desired.
+
+MINGW32_PREFIX=${MINGW32_PREFIX:-/usr/local/mingw32}
+LIBUSB_PREFIX=${LIBUSB_PREFIX:-/WINDOWS/ProgramFiles/LibUSB-Win32}
+
+CC=mingw32-gcc
+
+BUILDDIR=build-mingw32
+mkdir -p ${BUILDDIR} || { echo "Cannot create build dir $BUILDDIR"; exit 1; }
+
+cd ${BUILDDIR} || { echo "Cannot chdir to $BUILDDIR"; exit 1; }
+
+LDFLAGS="-L${MINGW32_PREFIX}/lib -L${LIBUSB_PREFIX}/lib/gcc"
+CPPFLAGS="-I${MINGW32_PREFIX}/include -I${LIBUSB_PREFIX}/include"
+
+env \
+    CC="${CC}" \
+    CPPFLAGS="${CPPFLAGS}" \
+    LDFLAGS="${LDFLAGS}" \
+    ../../configure \
+    --host=$(../../config.guess) \
+    --target=i386-unknowns-mingw32
+
+make all