Implement a definitive cygwin target for libzmq.

Makefile.am

@@ -208,6 +208,13 @@ src_libzmq_la_LDFLAGS = \
 	-version-info @LTVER@ \
 	@LIBZMQ_EXTRA_LDFLAGS@
 else
+if ON_CYGWIN
+src_libzmq_la_LDFLAGS = \
+	-no-undefined \
+	-avoid-version \
+	-version-info @LTVER@ \
+	@LIBZMQ_EXTRA_LDFLAGS@
+else
 if ON_ANDROID
 src_libzmq_la_LDFLAGS = \
 	-avoid-version \
@@ -227,6 +234,7 @@ src_libzmq_la_LDFLAGS = \
 endif
 endif
 endif
+endif
 
 src_libzmq_la_CPPFLAGS =
 src_libzmq_la_CXXFLAGS = @LIBZMQ_EXTRA_CXXFLAGS@
@@ -507,6 +515,7 @@ tests_test_atomics_SOURCES = tests/test_atomics.cpp
 tests_test_atomics_LDADD = src/libzmq.la
 
 if !ON_MINGW
+if !ON_CYGWIN
 test_apps += \
 	tests/test_shutdown_stress \
 	tests/test_pair_ipc \
@@ -539,6 +548,7 @@ test_apps += tests/test_fork
 tests_test_fork_SOURCES = tests/test_fork.cpp
 tests_test_fork_LDADD = src/libzmq.la
 
+endif
 endif
 endif
 

README.cygwin.md

+libzmq-cygwin
+=============
+
+Definitive build fixes for cygwin  (See https://github.com/zeromq/pyzmq/issues/113 for partial solution)
+
+What's changed:
+  ./Makefile.am                       Add cygwin-specific target mostly the same as mingw
+  ./configure.ac                      Add cygwin-specific target mostly the same as mingw
+  ./tests/testutil.hpp                Lengthen socket timeout to 121 seconds
+  
+What's new:
+  ./README.cygwin.md                  This file
+  ./builds/cygwin                     Folder for cygwin-specific build files
+  ./builds/cygwin/Makefile.cygwin     Makefile for cygwin targets
+  

builds/cygwin/Makefile.cygwin

+CC=gcc
+CFLAGS=-Wall -Os -g -DDLL_EXPORT -DFD_SETSIZE=4096 -DZMQ_USE_SELECT -I.
+LIBS=-lws2_32
+
+OBJS = ctx.o reaper.o dist.o err.o \
+	clock.o metadata.o random.o \
+	object.o own.o \
+	io_object.o io_thread.o \
+	lb.o fq.o \
+	address.o tcp_address.o ipc_address.o \
+	ipc_connecter.o ipc_listener.o \
+	tcp_connecter.o tcp_listener.o \
+	mailbox.o msg.o mtrie.o \
+	pipe.o precompiled.o proxy.o \
+	signaler.o stream_engine.o \
+	thread.o trie.o \
+	ip.o tcp.o \
+	pgm_socket.o pgm_receiver.o pgm_sender.o \
+	raw_decoder.o raw_encoder.o \
+	v1_decoder.o v1_encoder.o v2_decoder.o v2_encoder.o \
+	socket_base.o session_base.o options.o \
+	req.o rep.o push.o pull.o pub.o sub.o pair.o \
+	dealer.o router.o xpub.o xsub.o stream.o \
+	poller_base.o select.o poll.o epoll.o kqueue.o devpoll.o \
+	curve_client.o curve_server.o \
+	mechanism.o null_mechanism.o plain_client.o plain_server.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,-Wl,--export-all-symbols -Wl,--enable-auto-import -Wl,--whole-archive $@.a -Wl,--no-whole-archive $(LIBS)
+
+%.exe: %.o libzmq.dll
+	g++ -o $@ $^
+
+clean:
+	del *.o *.a *.dll *.exe
+	

configure.ac

@@ -134,6 +134,7 @@ libzmq_dso_visibility="yes"
 
 # Platform specific checks
 libzmq_on_mingw32="no"
+libzmq_on_cygwin="no"
 libzmq_on_android="no"
 libzmq_on_linux="no"
 
@@ -269,6 +270,8 @@ case "${host_os}" in
         # Define on Cygwin to enable all library features
         CPPFLAGS="-D_GNU_SOURCE $CPPFLAGS"
         AC_DEFINE(ZMQ_HAVE_CYGWIN, 1, [Have Cygwin])
+        libzmq_on_cygwin="yes"
+        libzmq_dso_visibility="no"        
         if test "x$enable_static" = "xyes"; then
             AC_MSG_ERROR([Building static libraries is not supported under Cygwin])
         fi
@@ -472,6 +475,7 @@ AC_LANG_POP([C++])
 
 AM_CONDITIONAL(BUILD_TIPC, test "x$libzmq_tipc_support" = "xyes")
 AM_CONDITIONAL(ON_MINGW, test "x$libzmq_on_mingw32" = "xyes")
+AM_CONDITIONAL(ON_CYGWIN, test "x$libzmq_on_cygwin" = "xyes")
 AM_CONDITIONAL(ON_ANDROID, test "x$libzmq_on_android" = "xyes")
 AM_CONDITIONAL(ON_LINUX, test "x$libzmq_on_linux" = "xyes")
 

tests/testutil.hpp

@@ -267,10 +267,15 @@ void setup_test_environment()
     _CrtSetReportMode( _CRT_ASSERT, _CRTDBG_MODE_FILE );
     _CrtSetReportFile( _CRT_ASSERT, _CRTDBG_FILE_STDERR );
 #   endif
+#else
+#if defined ZMQ_HAVE_CYGWIN
+    // abort test after 121 seconds
+    alarm(121);
 #else
     // abort test after 60 seconds
     alarm(60);
 #endif
+#endif
 #if defined __MVS__
     // z/OS UNIX System Services: Ignore SIGPIPE during test runs, as a
     // workaround for no SO_NOGSIGPIPE socket option.