Problem building DLLhelpers using Cygwin

Problem building DLLhelpers using Cygwin

[Vassili Sukharev]

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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Re: Problem building DLLhelpers using Cygwin

[Charles Wilson]

It's possible some of the problems you are seeing were related to the
recent string of patches to binutils posted by DJ, me, and others.
Although there is not yet a cygwin package that contains these fixes,
you could try one of the following:

replace /usr/bin/ld.exe with the one here:
http://cygutils.netpedia.net/V1.1/linker/ld.exe.tar.gz (don't forget to
save a backup)

download the current binutils source from CVS
( http://sources.redhat.com/binutils/ ) and build the whole mess it
yourself -- this includes dlltool, ld.exe, et al. 

   ./configure --prefix=/usr --host=i686-pc-cygwin
--target=i686-pc-cygwin
   make
   make -n install
; note which files will be replaced and make backup copies
   make install

--Chuck


Vassili Sukharev wrote:
> 
> 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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