Problem building DLLhelpers using Cygwin

["Vassili Sukharev" <vassili dot sukharev at ecora dot com>]

Hi All,

I need to build a dll with the cygwin gcc. As a starting point, I tried
building a few dll examples, called dllhelpers, available from the following
page:

http://www.nanotech.wisc.edu/~khan/software/gnu-win32/dllhelpers.html

There is a version for cygwin, which is supposed to be buildable without any
adjustments to makefile. Upon typing make, the following happens:

c++ -c -DBUILDING_DLL=1 -I. -I/mingw/include -g  -mno-cygwin -o dllclass.o
dllclass.cc
c++ -c -DBUILDING_DLL=1 -I. -I/mingw/include -g  -mno-cygwin -o dllexterns.o
dllexterns.cc
gcc -c -DBUILDING_DLL=1 -I. -I/mingw/include -g  -mno-cygwin -o dllinit.o
dllinit.c
dllwrap --export-all --output-def
cxxdll.def -mwindows -k --target=i386-mingw32 \
    --implib libcxx.dll.a --driver-name c++ -o cxxdll.dll \
    dllclass.o dllexterns.o dllinit.o -L/mingw/lib -s -mno-cygwin
Warning: no export definition file provided
dllwrap will create one, but may not be what you want
c++ -c -I. -I/mingw/include -g  -mno-cygwin -o usedll.o usedll.cc
c++ -o usedll.exe -g  -mno-cygwin  usedll.o -L./ -L/mingw/lib -lcxxdll
usedll.o: In function `main':
usedll.cc:30: undefined reference to `_imp___8DllClass$instances'
usedll.cc:30: undefined reference to `_imp__global_dllclass2'
usedll.cc:30: undefined reference to `_imp__global_dllclass2'
usedll.cc:30: undefined reference to `_imp___8DllClass$instances'
usedll.cc:30: undefined reference to `_imp__global_dllclass1'
usedll.cc:30: undefined reference to `_imp__global_dllclass1'
usedll.cc:30: undefined reference to `_imp__global_int_variable'
usedll.cc:38: undefined reference to `_imp___8DllClass$instances'
collect2: ld returned 1 exit status
make: *** [usedll.exe] Error 1


Several people have suggested various things on the mingw mailing list, but
so far I could not fix these errors. Any help would be greatly appreciated.

Thanks,
Vassili



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