test2-dynamic

In this directory I use the same source code as test1-static, but 
I try to build a shared library instead.  To build a shared library
for libmodule1.la, first I add the -rpath variable.  This makes libtool
attempt to build shared libraries, but it gives this warning:

libtool: link: warning: undefined symbols not allowed in i686-pc-cygwin shared libraries

Then it proceeds to build only static libraries.  So I add -no-undefined to
the link of libmodule1.la.  This makes it actually build a shared library.
When it does the libtool install step, I see that these files were installed:

-rwxr-xr-x    1 bryce    unknown    668055 Oct 11 02:40 bin/cygmodule1-0.dll
-rw-r--r--    1 bryce    unknown       664 Oct 11 02:40 lib/libmodule1.a
-rw-r--r--    1 bryce    unknown      2946 Oct 11 02:40 lib/libmodule1.dll.a
-rw-r--r--    1 bryce    unknown       728 Oct 11 02:40 lib/libmodule1.la

File types are
bin/cygmodule1-0.dll: MS Windows PE Intel 80386 console DLL
lib/libmodule1.a:     current ar archive
lib/libmodule1.dll.a: current ar archive
lib/libmodule1.la:    ASCII English text

But, trying to link with this shared library fails.

libtool g++ -Wall -g -o uselib uselib.cc libmodule1.la
g++ -Wall -g -o .libs/uselib uselib.cc  .libs/libimp-cygmodule1-0.a -Wl,--rpath -Wl,/home/bryce/plugin-test/test2-dynamic/lib
Warning: resolving _module_name by linking to __imp__module_name (auto-import)
fu000001.o(.idata$3+0xc): undefined reference to `_libs_libimp_cygmodule1_0_a_iname'
nmth000000.o(.idata$4+0x0): undefined reference to `_nm__module_name'
collect2: ld returned 1 exit status
make: *** [uselib] Error 1

Then I finally read about __declspec(dllexport) and __declspec(dllimport).
When compiling the module I add __declspec(dllexport) on data and functions.
When using the module, the prototypes for say __declspec(dllimport).
Now it works!