Fix SSL on cygwin.

configure.ac

@@ -262,6 +262,25 @@ if test "x$SSL" != "xno"; then
 		AC_CHECK_LIB( ssl, SSL_shutdown,, SSL=no )
 	])
 
+	if test "x$SSL" != "xno"; then
+		AC_MSG_CHECKING([whether openssl is usable])
+		AC_LINK_IFELSE([
+			AC_LANG_PROGRAM([[
+				#include <openssl/ssl.h>
+			]], [[
+				SSL_CTX* ctx = SSL_CTX_new(TLSv1_method());
+				SSL* ssl = SSL_new(ctx);
+				DH* dh = DH_new();
+			]])
+		], [
+			AC_MSG_RESULT([yes])
+		], [
+			AC_MSG_RESULT([no])
+			SSL=no
+		])
+
+	fi
+
 	if test "x$SSL" = "xno" ; then
 		ZNC_AUTO_FAIL([SSL],
 			[OpenSSL not found. Try --disable-openssl.],
@@ -505,6 +524,7 @@ AC_SUBST([LDFLAGS])
 AC_SUBST([LIBS])
 AC_SUBST([LIBZNC])
 AC_SUBST([LIBZNCDIR])
+AC_SUBST([ISCYGWIN])
 AC_SUBST([MODLINK])
 AC_SUBST([NOSSL])
 AC_SUBST([TCL_FLAGS])

modules/Makefile.in

@@ -20,9 +20,16 @@ CXX      := @CXX@
 MODFLAGS := -I$(srcdir)/../include -I../include @CPPFLAGS@ @MODFLAGS@
 MODLINK  := @MODLINK@
 LDFLAGS  := @LDFLAGS@
+
 # LIBS are not and should not be used in here.
 # The znc binary links already against those.
-# LIBS     := @LIBS@
+# ...but not on cygwin!
+LIBS     :=
+ifeq "@ISCYGWIN@" "1"
+LIBS     += @LIBS@
+LDFLAGS  += ${LIBS}
+endif
+
 PERL_ON  := @PERL@
 PERL     := @PERL_BINARY@
 PYTHON_ON:= @PYTHON@
@@ -118,7 +125,7 @@ clean:
 
 %.so: %.o Makefile
 	$(E) Linking module $(notdir $(basename $@))...
-	$(Q)$(CXX) $(MODFLAGS) $(LDFLAGS) $(MODLINK) -o $@ $< $($(notdir $(basename $@))LDFLAGS)
+	$(Q)$(CXX) $(MODFLAGS) $(LDFLAGS) $(MODLINK) -o $@ $< $($(notdir $(basename $@))LDFLAGS) $(LIBS)
 
 uninstall:
 	# Yes, we are lazy, just remove everything in there