libtool issue on shared lib

[marco atzeri]

I am trying to adapt socketxx to cygwin
(http://www.linuxhacker.at/socketxx)

In addition to a lot of other problems, I have a puzzling libtool issue


make[2]: Entering directory 
`/pub/devel/gdcm/socket++-1.12.13_build/socket++'
/bin/sh ../libtool --tag=CXX    --mode=link g++   -Wall -g -O2 
-version-info 1:2:0  -o libsocket++.la -rpath /usr/local/lib 
sockstream.lo sockinet.lo sockunix.lo  pipestream.lo fork.lo protocol.lo 
echo.lo smtp.lo ftp.lo  sig.lo
libtool: link: warning: undefined symbols not allowed in i686-pc-cygwin 
shared libraries

but

g++   -Wall -g -O2 -shared  -o cygsocket++-0.dll 
-Wl,--out-implib=libsocket++.dll.a sockstream.o sockinet.o sockunix.o 
pipestream.o fork.o protocol.o echo.o smtp.o ftp.o  sig.o
Creating library file: libsocket++.dll.a

$ cygcheck ./cygsocket++-0.dll
E:\cygwin\pub\devel\gdcm\socket++-1.12.13_build\socket++\cygsocket++-0.dll
   E:\cygwin\bin\cygwin1.dll
[cut]
   E:\cygwin\bin\cyggcc_s-1.dll
   E:\cygwin\bin\cygstdc++-6.dll


So where is the undefined symbol ??


I am already using "autoreconf -f -i" and the libtool
seems equivalent to what is working for any other package

adding LT_INIT([dlopen win32-dll shared])
to configure.in had no effect

and the  Makefile.am is very basic
---------------------------------------------
INCLUDES = -I$(top_srcdir) -I$(top_builddir)

lib_LTLIBRARIES = libsocket++.la
libsocket___la_SOURCES = sockstream.cpp sockstream.h \
         sockinet.cpp sockinet.h \
         sockunix.cpp sockunix.h\
         pipestream.cpp pipestream.h \
         fork.cpp fork.h \
         protocol.cpp protocol.h \
         echo.cpp echo.h \
         smtp.cpp smtp.h \
         ftp.cpp ftp.h \
         sig.cpp sig.h

libsocketincludedir=$(includedir)/socket++
libsocketinclude_HEADERS = \
         sockstream.h \
         sockinet.h \
         sockunix.h\
         pipestream.h \
         fork.h \
         protocol.h \
         echo.h \
         smtp.h \
         ftp.h \
         sig.h
libsocket___la_LDFLAGS = -version-info @LIBSOCKET_SO_VERSION@
-------------------------------------------------

Any idea about what I should look for ?

Marco


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