Java cross-compiler to AVR target (?!)

Thu Oct 7 18:01:00 GMT 2004

E. Weddington writes:
 > 
 > 1. Would the Java compiler be "screwed up" or "incomplete" without those 
 > other subdirectories being built?
No.
 > 2. Would it even matter, given the target, if those subdirectories were 
 > not being built?
It depends if you want these Java programs to run. You need a runtime
library to do anything at all.
 > 3. I'm sure most of the standard Java libraries don't apply to an 
 > embedded processor. But, all that would be required to control the AVR, 
 > is to be able to read/write to memory-mapped registers and to flip bits 
 > at the byte level (like C bitwise operators). Is this at all feasible in 
 > Java?
You'd need to write a native code device driver to do that.
 > 4. Any idea what's with the oddly named "avr-avr-gcjh.exe" installed file?
Beats me. I would guess it's a bug. :-)
The problem with gcj for small targets is that libgcj is a rather
monolithic library with a vast amount of support for all things Java.
It wouldn't fit in an AVR.
It is possible to write a small subset Java runtime library: Sun have
an interesting one in JavaCard(TM). It would be an interesting
exercise.
Andrew.