javah output file naming weirdness

[Andrew John Hughes]

We recently uncovered a bug in the JikesRVM
(http://jira.codehaus.org/browse/RVM-456), namely that we were relying
on the naming of the header files generated by javah being in the same
style as those generated by the proprietary Sun JDK.

As can be seen in the bug report, the breakage showed up when using
IcedTea6/OpenJDK6 to build JikesRVM.  On OpenJDK6,

javah -verbose -d
/home/andrew/projects/classpath/jikesrvm/target/prototype_x86_64-linux/c
-classpath /home/andrew/projects/classpath/jikesrvm/target/prototype_x86_64-linux/jksvm.jar
org.jikesrvm.scheduler.greenthreads.VM_Process

produces a file named:

org_jikesrvm_scheduler_greenthreads_VM_Process.h

while apparently the proprietary version emits:

org_jikesrvm_scheduler_greenthreads_VM_0005fProcess.h

(encoding the classname's underscore character as 0005f).  We fixed
our bug by explicitly asking for javah to emit the latter named file,
but is this a regression in the OpenJDK6 version of javah?  Even the
OpenJDK I was using before (b12) still emitted the 0005f version (at
least I presume so, because the build worked...)

Any ideas?
-- 
Andrew :-)

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