RE: Is it possible to port to GCJ ?

[Glenn Chambers]

> One of my tasks which is on the back burner of a stove I don't own in
> a dump a hundred miles away is to look at CNI and determine how might
> be the easiest method to get Classpath to work with it.  If I read the
> above messages correctly this means I should think in terms of either
> providing #ifdef'ing all the native code or writing some portability
> layer?

Here's a trivial sample of gcj's CNI; I put it together when I was
trying to figure out how to do it.  (grin)

As you can see, it's rather different from the JNI interface...

==> sampNat.cc <==
#include "sample.h"
#include <stream.h>
#include <java/io/PrintStream.h>
#include <java/lang/System.h>
#include <java/lang/String.h>
#include <cni.h>

void sample::myNative(java::lang::String *s)
{
  cout << "Hello, C++" << endl;

  // The following line causes a link error for a missing typeinfo
  // unless this file is compiled with '-fno-rtti'
  java::lang::System::out->println(s);
}

==> sample.java <==
public class sample {
  public native void myNative(String s);

  public void myJava(String s) {
    s = s + ", Java";
    System.out.println(s);
  }

  public static void main(String args[]) {
    sample x = new sample();
    x.myJava("Hello");
    x.myNative("Hello, Java (from C++)");
    x.myJava("Goodbye");
  }
}