Re: JNI with Cygwin32

[Andrew Mickish <mickish@cmu.edu>]

One thing that I don't recall mentioning in any of my previous posts is that
editing one of the Java header files is necessary.  I guess VC++ defines a type
called __int64, which is not defined in the gcc header files.  In your jdk
directory, change include/win32/jni_md.h to look like this:

    #define JNIEXPORT /*__declspec(dllexport)*/
    #define JNICALL __stdcall

    typedef long jint;
    typedef long /*__int64*/ jlong;
    typedef signed char jbyte;

Maybe someone else can say whether this is actually an oversight in the gcc
header files.

The line above about declspec has to do with the different ways that VC++ and
gcc export functions from DLLs.  VC++ uses a simple keyword, but gcc has a
convoluted linking procedure based on an init.cc file.  I have been subscribed
to the list for months hoping to hear justification for this, or the
announcement of a simplified procedure, but haven't heard anything yet.

If you send me a trace of your remaining errors I will see if I recognize
anything.

--Andrew Mickish


S. Suchitra wrote:

> Hi,
>
>         I have been reading your messages on the Cygwin32 mailing list
> about getting JNI to work with gcc on the Cygnus Win32 interface.
> I downloaded your zip file with the HelloWorld example. However I am
> not able to compile it using your Makefile..it seems to be giving a
> number of parse and syntax errors in header files like jni.h and some other
> files in the Cygwin32 library.
>
> I was wondering whether you also had similar problems and how you overcame
> them. I would really appreciate any pointers you may be able to give me.
> I am working on a Windows Nt 4.0 machine with Cygnus Win 32 19.1 release.
>
> Thanking you,
> Suchitra.
>
> srinis@caip.rutgers.edu

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