cygwin_sharedlib.patch

diff -ru a/configure b/configure
--- a/configure	2015-08-17 12:49:50.000000000 +0200
+++ b/configure	2016-11-30 13:48:09.452097000 +0100
@@ -625,6 +625,8 @@
 ON_LINUX_TRUE
 ON_ANDROID_FALSE
 ON_ANDROID_TRUE
+ON_CYGWIN_FALSE
+ON_CYGWIN_TRUE
 ON_MINGW_FALSE
 ON_MINGW_TRUE
 BUILD_TIPC_FALSE
@@ -17856,6 +17858,7 @@
         if test "x$enable_static" = "xyes"; then
             as_fn_error $? "Building static libraries is not supported under Cygwin" "$LINENO" 5
         fi
+        libzmq_on_cygwin="yes"
         ;;
     *)
         as_fn_error $? "unsupported system: ${host_os}." "$LINENO" 5
@@ -19923,6 +19926,14 @@
   ON_MINGW_FALSE=
 fi
 
+ if test "x$libzmq_on_cygwin" = "xyes"; then
+  ON_CYGWIN_TRUE=
+  ON_CYGWIN_FALSE='#'
+else
+  ON_CYGWIN_TRUE='#'
+  ON_CYGWIN_FALSE=
+fi
+
  if test "x$libzmq_on_android" = "xyes"; then
   ON_ANDROID_TRUE=
   ON_ANDROID_FALSE='#'
@@ -20441,6 +20452,10 @@
   as_fn_error $? "conditional \"ON_MINGW\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
 fi
+if test -z "${ON_CYGWIN_TRUE}" && test -z "${ON_CYGWIN_FALSE}"; then
+  as_fn_error $? "conditional \"ON_CYGWIN\" was never defined.
+Usually this means the macro was only invoked conditionally." "$LINENO" 5
+fi
 if test -z "${ON_ANDROID_TRUE}" && test -z "${ON_ANDROID_FALSE}"; then
   as_fn_error $? "conditional \"ON_ANDROID\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
diff -ru a/configure.ac b/configure.ac
--- a/configure.ac	2015-06-15 11:43:08.000000000 +0200
+++ b/configure.ac	2016-11-30 13:48:09.468608000 +0100
@@ -272,6 +272,7 @@
         if test "x$enable_static" = "xyes"; then
             AC_MSG_ERROR([Building static libraries is not supported under Cygwin])
         fi
+        libzmq_on_cygwin="yes"
         ;;
     *)
         AC_MSG_ERROR([unsupported system: ${host_os}.])
@@ -472,6 +473,7 @@
 
 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")
 
diff -ru a/Makefile.am b/Makefile.am
--- a/Makefile.am	2015-08-17 12:48:42.000000000 +0200
+++ b/Makefile.am	2016-11-30 13:48:09.474611900 +0100
@@ -208,6 +208,13 @@
 	-version-info @LTVER@ \
 	@LIBZMQ_EXTRA_LDFLAGS@
 else
+if ON_CYGWIN
+libzmq_la_LDFLAGS = \
+	-no-undefined \
+	-avoid-version \
+	-version-info @LTVER@ \
+	@LIBZMQ_EXTRA_LDFLAGS@
+else
 if ON_ANDROID
 libzmq_la_LDFLAGS = \
 	-avoid-version \
@@ -227,6 +234,7 @@
 endif
 endif
 endif
+endif
 
 libzmq_la_CPPFLAGS =
 libzmq_la_CXXFLAGS = @LIBZMQ_EXTRA_CXXFLAGS@
diff -ru a/Makefile.in b/Makefile.in
--- a/Makefile.in	2015-08-17 12:49:50.000000000 +0200
+++ b/Makefile.in	2016-11-30 13:48:09.485132500 +0100
@@ -1038,20 +1038,26 @@
 	src/zmq.cpp \
 	src/zmq_utils.cpp
 
-@ON_ANDROID_FALSE@@ON_LINUX_FALSE@@ON_MINGW_FALSE@libzmq_la_LDFLAGS = \
-@ON_ANDROID_FALSE@@ON_LINUX_FALSE@@ON_MINGW_FALSE@	-version-info @LTVER@ \
-@ON_ANDROID_FALSE@@ON_LINUX_FALSE@@ON_MINGW_FALSE@	@LIBZMQ_EXTRA_LDFLAGS@ \
-@ON_ANDROID_FALSE@@ON_LINUX_FALSE@@ON_MINGW_FALSE@	-Wl
+@ON_ANDROID_FALSE@@ON_CYGWIN_FALSE@@ON_LINUX_FALSE@@ON_MINGW_FALSE@libzmq_la_LDFLAGS = \
+@ON_ANDROID_FALSE@@ON_CYGWIN_FALSE@@ON_LINUX_FALSE@@ON_MINGW_FALSE@	-version-info @LTVER@ \
+@ON_ANDROID_FALSE@@ON_CYGWIN_FALSE@@ON_LINUX_FALSE@@ON_MINGW_FALSE@	@LIBZMQ_EXTRA_LDFLAGS@ \
+@ON_ANDROID_FALSE@@ON_CYGWIN_FALSE@@ON_LINUX_FALSE@@ON_MINGW_FALSE@	-Wl
 
-@ON_ANDROID_FALSE@@ON_LINUX_TRUE@@ON_MINGW_FALSE@libzmq_la_LDFLAGS = \
-@ON_ANDROID_FALSE@@ON_LINUX_TRUE@@ON_MINGW_FALSE@	-version-info @LTVER@ \
-@ON_ANDROID_FALSE@@ON_LINUX_TRUE@@ON_MINGW_FALSE@	@LIBZMQ_EXTRA_LDFLAGS@ \
-@ON_ANDROID_FALSE@@ON_LINUX_TRUE@@ON_MINGW_FALSE@	-Wl,--version-script=$(srcdir)/src/libzmq.vers
+@ON_ANDROID_FALSE@@ON_CYGWIN_FALSE@@ON_LINUX_TRUE@@ON_MINGW_FALSE@libzmq_la_LDFLAGS = \
+@ON_ANDROID_FALSE@@ON_CYGWIN_FALSE@@ON_LINUX_TRUE@@ON_MINGW_FALSE@	-version-info @LTVER@ \
+@ON_ANDROID_FALSE@@ON_CYGWIN_FALSE@@ON_LINUX_TRUE@@ON_MINGW_FALSE@	@LIBZMQ_EXTRA_LDFLAGS@ \
+@ON_ANDROID_FALSE@@ON_CYGWIN_FALSE@@ON_LINUX_TRUE@@ON_MINGW_FALSE@	-Wl,--version-script=$(srcdir)/src/libzmq.vers
 
-@ON_ANDROID_TRUE@@ON_MINGW_FALSE@libzmq_la_LDFLAGS = \
-@ON_ANDROID_TRUE@@ON_MINGW_FALSE@	-avoid-version \
-@ON_ANDROID_TRUE@@ON_MINGW_FALSE@	-version-info @LTVER@ \
-@ON_ANDROID_TRUE@@ON_MINGW_FALSE@	@LIBZMQ_EXTRA_LDFLAGS@
+@ON_ANDROID_TRUE@@ON_CYGWIN_FALSE@@ON_MINGW_FALSE@libzmq_la_LDFLAGS = \
+@ON_ANDROID_TRUE@@ON_CYGWIN_FALSE@@ON_MINGW_FALSE@	-avoid-version \
+@ON_ANDROID_TRUE@@ON_CYGWIN_FALSE@@ON_MINGW_FALSE@	-version-info @LTVER@ \
+@ON_ANDROID_TRUE@@ON_CYGWIN_FALSE@@ON_MINGW_FALSE@	@LIBZMQ_EXTRA_LDFLAGS@
+
+@ON_CYGWIN_TRUE@@ON_MINGW_FALSE@libzmq_la_LDFLAGS = \
+@ON_CYGWIN_TRUE@@ON_MINGW_FALSE@	-no-undefined \
+@ON_CYGWIN_TRUE@@ON_MINGW_FALSE@	-avoid-version \
+@ON_CYGWIN_TRUE@@ON_MINGW_FALSE@	-version-info @LTVER@ \
+@ON_CYGWIN_TRUE@@ON_MINGW_FALSE@	@LIBZMQ_EXTRA_LDFLAGS@
 
 @ON_MINGW_TRUE@libzmq_la_LDFLAGS = \
 @ON_MINGW_TRUE@	-no-undefined \