not to be able to run a swt example

Hi, 
I'm new to gcj. 
I use mingw 3.4(eclipse supported). 
I use swt in my applicaiton,too. 
I have compiled swt.jar and got .o file after running the line below: 
gcj -fjni -c swt.jar (I have compiled using -findirect-dispatch first,then
this and it has gived me object file, too.) 

And I have gotten .o file of my swt application running the command line
below: 
gcj --classpath=swt.jar -c HelloSWT.java 

And got exe after running below: 
gcj --shared --main=HelloSWT -o test.exe HelloSWT.o swt.o 

But at last,when I have double-clicked the exe file,I have been getting
error which has been giving the error as no being a Win32 applicaiton :( 

I suppose it's about dll and using -lswt but I ma not sure how I must use
these. 
If you help,I'll be very happy! 
Thanks.
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