new script to set env variables for mingw cross build

scripts/setenv-mingw-xbuild.sh

@@ -0,0 +1,42 @@
+#!/bin/sh -e
+#
+# set environment variables for mingw/mxe cross-build
+#
+# Usage: source ./scripts/setenv-mingw-xbuild.sh
+#
+# Prerequisites:
+#
+# Please see http://mxe.cc/#requirements
+#
+# Also see http://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Cross-compiling_for_Windows_on_Linux_or_Mac_OS_X
+#
+
+OPENSCADDIR=$PWD
+
+if [ ! $BASEDIR ]; then
+	BASEDIR=$HOME/openscad_deps
+fi
+DEPLOYDIR=$OPENSCADDIR/mingw32
+MXEDIR=$BASEDIR/mxe
+PATH=$MXEDIR/usr/bin:$PATH
+
+echo MXEDIR: $MXEDIR
+echo BASEDIR: $BASEDIR
+echo DEPLOYDIR: $DEPLOYDIR
+echo OPENSCADDIR: $OPENSCADDIR
+echo PATH modified with $MXEDIR/usr/bin
+if [ ! $NUMCPU ]; then
+	echo "note: you can 'export NUMCPU=x' for multi-core compiles (x=number)";
+	NUMCPU=1
+fi
+if [ ! $NUMJOBS ]; then
+	echo "note: you can 'export NUMJOBS=x' for building multiple pkgs at once"
+	if [ $NUMCPU -gt 2 ]; then
+		NUMJOBS=$((NUMCPU/2))
+	else
+		NUMJOBS=1
+	fi
+fi
+echo NUMCPU: $NUMCPU
+echo NUMJOBS: $NUMJOBS
+