[Bug java/17831] New: GCJ/CNI should be usable without 'gcjh'

["csm at gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

A nice enhancement to GCJ would be to remove the need to invoke 'gcjh' on
compliled classes before compiling CNI C++ source. Extending this to JNI code
would be nice, too, but potentially harder.

That is, the following command line should work:

   $ gcj -shared -o lib-foo.so foo.java foo.cc

Or, even this exact sequence:

   $ gcj -c -o foo.o foo.java
   $ gcj -c -o foo-cni.o foo.cc
   $ gcj -shared -o lib-foo.so foo.o foo-cni.o

In theory this should be possible, since everything you need to compile to
'lib-foo.so' is present in those two files. But in practice, of course, this
touches potentially everything from g++ to cpp, and becomes pretty hairy indeed.

Maybe a good way to do this would be to extend cpp so front-ends can register
hooks to the include-lookups, so gcj could, for example, intercept certain
#includes to produce CNI headers on-the-fly.

Also, gcj/gcjh should be able to generate CNI/JNI headers from java source. gcjx
can (will be able to) do this, for example.

-- 
           Summary: GCJ/CNI should be usable without 'gcjh'
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: java
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: csm at gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org,java-prs at gcc dot gnu
                    dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17831