add simple Makefile to build with mingw32

builds/mingw32/Makefile.mingw32

+CC=gcc
+CFLAGS=-Wall -Os -g -DDLL_EXPORT -DFD_SETSIZE=1024 -I.
+LIBS=-lws2_32
+
+OBJS = address.o clock.o ctx.o dealer.o decoder.o devpoll.o dist.o encoder.o epoll.o err.o fq.o \
+	io_object.o io_thread.o ip.o ipc_address.o ipc_connecter.o ipc_listener.o kqueue.o lb.o \
+	mailbox.o msg.o mtrie.o object.o options.o own.o pair.o pgm_receiver.o pgm_sender.o \
+	pgm_socket.o pipe.o poll.o poller_base.o precompiled.o proxy.o pub.o pull.o push.o \
+	random.o raw_decoder.o raw_encoder.o reaper.o rep.o req.o router.o select.o session_base.o \
+	signaler.o socket_base.o stream_engine.o sub.o tcp.o tcp_address.o tcp_connecter.o tcp_listener.o \
+	thread.o trie.o v1_decoder.o v1_encoder.o xpub.o xsub.o zmq.o zmq_utils.o
+
+%.o: ../../src/%.cpp
+	$(CC) -c -o $@ $< $(CFLAGS)
+
+%.o: ../../perf/%.cpp
+	$(CC) -c -o $@ $< $(CFLAGS)
+
+all: libzmq.dll
+
+perf: inproc_lat.exe inproc_thr.exe local_lat.exe local_thr.exe remote_lat.exe remote_thr.exe
+
+libzmq.dll: $(OBJS)
+	g++ -shared -o $@ $^ -Wl,--out-implib,$@.a $(LIBS)
+
+%.exe: %.o libzmq.dll
+	g++ -o $@ $^
+
+clean:
+	del *.o *.a *.dll *.exe
+	

builds/mingw32/platform.hpp

+/*
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_PLATFORM_HPP_INCLUDED__
+#define __ZMQ_PLATFORM_HPP_INCLUDED__
+
+//  This is the platform definition for the MSVC platform.
+//  As a first step of the build process it is copied to
+//  zmq directory to take place of platform.hpp generated from
+//  platform.hpp.in on platforms supported by GNU autotools.
+//  Place any MSVC-specific definitions here.
+
+#define ZMQ_HAVE_WINDOWS
+
+#endif