Check out this solution from the mailing list archives:
http://sources.redhat.com/ml/cygwin/2003-06/msg00357.html
Alan Thompson
At 10:09 PM 7/31/2003 -0600, Marcus G. Daniels wrote:
>I'm having a problem getting DLLs compiled with Cygwin to load into Sun JDK 1.4.1.
>In the past this has worked, so I hope this is fixable without too much work.
>
>Here's an example. Take a simple Java Native Interface method like this:
>
>$ cat jniTest.c
>void Java_Test_test () { printf ("test\n");}
>
>And compile it like so:
>
>gcc -shared -o jniTest.dll jniTest.c
>
>Also needed is the Java-side file:
>
>public class Test {
> public native void test ();
> public static void main (String args[]) {
> Test test = new Test ();
> System.out.println ("loading jniTest");
> System.loadLibrary ("jniTest");
> System.out.println ("calling native method");
> test.test ();
> System.out.println ("success");
> }
>}
>
>Compiled it like so from a Cygwin terminal (replace /cygdrive/i/j2sdk1.4.1_02 as
>appropriate):
>
>$ /cygdrive/i/j2sdk1.4.1_02/bin/javac Test.java
>
>Now run it, you should see it print "loading jniTest", but nothing more.
>
>$ CLASSPATH=. /cygdrive/i/j2sdk1.4.1_02/bin/java Test
>
>In contrast, relink the DLL, but not using "-mno-cygwin":
>
>$ gcc -mno-cygwin -shared -o jniTest.dll jniTest.c
>$ CLASSPATH=. /cygdrive/i/j2sdk1.4.1_02/bin/java Test
>
>Now it should print:
>
>loading jniTest
>calling native method
>test
>success
>
>
>
>
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