Please use this template for reporting suspected bugs or requests for help.

Issue description

I'm trying to compile a static libzmq.a in windows using mingw, I tried both the configure and Makefile.mingw32 file and got libzmq.a, but neither woked, here is the output:

../../../lib/libuc_protocol.a(context.cpp.obj):context.cpp:(.text+0x3c7):
undefined reference to `__imp_zmq_ctx_term'

../../../lib/libuc_protocol.a(context.cpp.obj):context.cpp:(.text+0xa03): undefined reference to __imp_zmq_ctx_new' ../../../lib/libuc_protocol.a(poller.cpp.obj):poller.cpp:(.text+0x682): undefined reference to __imp_zmq_poll' ../../../lib/libuc_protocol.a(socket.cpp.obj):socket.cpp:(.text+0x368): undefined reference to __imp_zmq_bind' ../../../lib/libuc_protocol.a(socket.cpp.obj):socket.cpp:(.text+0x408): undefined reference to __imp_zmq_connect' ../../../lib/libuc_protocol.a(socket.cpp.obj):socket.cpp:(.text+0x49a): undefined reference to __imp_zmq_setsockopt' ../../../lib/libuc_protocol.a(socket.cpp.obj):socket.cpp:(.text+0x4cb): undefined reference to __imp_zmq_setsockopt' ../../../lib/libuc_protocol.a(socket.cpp.obj):socket.cpp:(.text+0x500): undefined reference to __imp_zmq_setsockopt' ../../../lib/libuc_protocol.a(socket.cpp.obj):socket.cpp:(.text+0x532): undefined reference to __imp_zmq_setsockopt' ../../../lib/libuc_protocol.a(socket.cpp.obj):socket.cpp:(.text+0x5a3): undefined reference to __imp_zmq_setsockopt' ../../../lib/libuc_protocol.a(socket.cpp.obj):socket.cpp:(.text+0x623): more undefined references to __imp_zmq_setsockopt' follow ../../../lib/libuc_protocol.a(socket.cpp.obj):socket.cpp:(.text+0x9c7): undefined reference to __imp_zmq_close' ../../../lib/libuc_protocol.a(socket.cpp.obj):socket.cpp:(.text+0x1306): undefined reference to __imp_zmq_setsockopt' ../../../lib/libuc_protocol.a(socket.cpp.obj):socket.cpp:(.text+0x1571): undefined reference to __imp_zmq_socket' ../../../lib/libuc_protocol.a(worker.cpp.obj):worker.cpp:(.text+0x521): undefined reference to __imp_zmq_proxy_steerable' ../../../lib/libuc_protocol.a(zeromq.cpp.obj):zeromq.cpp:(.text+0x31a): undefined reference to __imp_zmq_errno' ../../../lib/libuc_protocol.a(certificate.cpp.obj):certificate.cpp:(.text+0x3a6): undefined reference to __imp_zmq_curve_public' ../../../lib/libuc_protocol.a(certificate.cpp.obj):certificate.cpp:(.text+0x685): undefined reference to __imp_zmq_curve_keypair' ../../../lib/libuc_protocol.a(frame.cpp.obj):frame.cpp:(.text+0x32e): undefined reference to __imp_zmq_msg_init_size' ../../../lib/libuc_protocol.a(frame.cpp.obj):frame.cpp:(.text+0x345): undefined reference to __imp_zmq_msg_data' ../../../lib/libuc_protocol.a(frame.cpp.obj):frame.cpp:(.text+0x372): undefined reference to __imp_zmq_msg_init' ../../../lib/libuc_protocol.a(frame.cpp.obj):frame.cpp:(.text+0x3dd): undefined reference to __imp_zmq_getsockopt' ../../../lib/libuc_protocol.a(frame.cpp.obj):frame.cpp:(.text+0x414): undefined reference to __imp_zmq_msg_size' ../../../lib/libuc_protocol.a(frame.cpp.obj):frame.cpp:(.text+0x420): undefined reference to __imp_zmq_msg_data' ../../../lib/libuc_protocol.a(frame.cpp.obj):frame.cpp:(.text+0x4e4): undefined reference to __imp_zmq_recvmsg' ../../../lib/libuc_protocol.a(frame.cpp.obj):frame.cpp:(.text+0x512): undefined reference to __imp_zmq_getsockopt' ../../../lib/libuc_protocol.a(frame.cpp.obj):frame.cpp:(.text+0x592): undefined reference to __imp_zmq_sendmsg' ../../../lib/libuc_protocol.a(frame.cpp.obj):frame.cpp:(.text+0x5f7): undefined reference to __imp_zmq_msg_close' ../../../lib/libuc_protocol.a(frame.cpp.obj):frame.cpp:(.text+0x696): undefined reference to __imp_zmq_msg_close' ../../../lib/libuc_protocol.a(frame.cpp.obj):frame.cpp:(.text+0x714): undefined reference to __imp_zmq_msg_init_size' ../../../lib/libuc_protocol.a(frame.cpp.obj):frame.cpp:(.text+0x72c): undefined reference to __imp_zmq_msg_data' ../../../lib/libuc_protocol.a(frame.cpp.obj):frame.cpp:(.text+0x765): undefined reference to __imp_zmq_msg_init' ../../../lib/libuc_protocol.a(frame.cpp.obj):frame.cpp:(.text+0x7ce): undefined reference to __imp_zmq_msg_init'

--

Environment

• libzmq version (commit hash if unreleased): zeromq-4.3.0
• OS: windows 64bit

Minimal test code / Steps to reproduce the issue

1. what I tried in Makefile.mingw32

all: libzmq.a

perf: inproc_lat.exe inproc_thr.exe local_lat.exe local_thr.exe remote_lat.exe remote_thr.exe

libzmq.dll: $(OBJS)
g++ -shared -static -O2 -s -o $@ $^ -Wl,--out-implib,$@.a $(LIBS)

libzmq.a: $(OBJS)
ar cr $@ $?

What's the actual result? (include assertion message & call stack if applicable)

undefiend reference

What's the expected result?

should export correct libzmq.a