GCJ silently compiles an illegal access to a package-private
class in another package.

Here's the testcase:

------------------ Snafu.java -------------------------------
public class Snafu {
  public static void main( String[] args) {
    foo.Bar.hello( );
  }
}
-------------------------------------------------------------

------------------ foo/Bar.java -----------------------------
package foo;

class Bar {
  public static void hello( ) { System.out.println( "Hello!"); }
}
-------------------------------------------------------------


Here's what JDK 1.4.2.03 on Linux says for this:
-------------------------------------------------------------
Snafu.java:3: foo.Bar is not public in foo; cannot be accessed from outside pack
age
    foo.Bar.hello( );
       ^
Snafu.java:3: hello() in foo.Bar is not defined in a public class or interface;
cannot be accessed from outside package
    foo.Bar.hello( );
           ^
2 errors
-------------------------------------------------------------