Problem creating a JNI DLL using Cygwin with Java 1.3

[Harris, Andrew S]

I'm trying to create a Java JNI DLL using Java 1.3 and the latest Cygwin,
without success. 

I'm using the Java JNI examples from
http://www.xraylith.wisc.edu/~khan/software/gnu-win32/index.html#java-jni ,
specifically Makefile.cyg with HelloWorldImp.c.

The makefile fails with this message:

	$ make -mf Makefile.cyg
	gcc  -c -DBUILDING_DLL=1 -D_DLL=1  -I. -Ic:/java/jdk1.3/include
-Ic:/java/jdk1.3
	/include/cygwin -g -Wall -O2  -o HelloWorldImp.o HelloWorldImp.c
	dllwrap --output-def hello.def --add-stdcall-alias --driver-name gcc
-o hello.
	dll \
	    HelloWorldImp.o -Wl,-e,__cygwin_noncygwin_dll_entry@12 -s
	dllwrap: no export definition file provided
	dllwrap: creating one, but that may not be what you want
	/usr/lib/libcygwin.a(dll_entry.o)(.text+0xfa):dll_entry.cc:
undefined reference
	to `_cygwin_dll_entry@12'
	collect2: ld returned 1 exit status
	dllwrap: gcc exited with status 1
	make: *** [hello.dll] Error 1
	$

Hope you can help me with this.

My jni_md.h file is:

	#ifndef _JAVASOFT_JNI_MD_H_
	#define _JAVASOFT_JNI_MD_H_

	#define JNIEXPORT __declspec(dllexport)
	#define JNIIMPORT __declspec(dllimport)
	#define JNICALL __stdcall

	typedef long jint;
	#ifdef __GNUC__
	    typedef long long jlong;
	#else
	    typedef __int64 jlong;
	#endif
	typedef signed char jbyte;

	#endif /* !_JAVASOFT_JNI_MD_H_ */

Previously I tried to follow the instructions in the Cygwin documentation,
however it appears that these instructions may have been written before
dllwrap was created, and in any case I was not able to create a dll
according to the instructions.

Thanks

Andrew Harris


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