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68 lines
2.8 KiB
Plaintext
68 lines
2.8 KiB
Plaintext
Things libgcj hackers should know
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---------------------------------
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If you want to hack on the libgcj files you need to be aware of the
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following things. There are probably lots of other things that should be
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explained in this HACKING file. Please add them if you discover them :)
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--
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A lot of the standard library files come from the GNU Classpath project.
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<http://www.gnu.org/software/classpath/>
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The libgcj and Classpath project have officially merged, but the merge
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is not yet complete. Our eventual goal is for Classpath to be an upstream
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source provider for libgcj, however it will be some time before this becomes
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reality: libgcj and Classpath have different implementations of many core
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java classes. In order to merge them, we need to select the best (most
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efficient, cleanest) implementation of each method/class/package, resolve
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any conflicts created by the merge, and test the final result.
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The merged files can be recognized by the standard Classpath copyright
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comments at the top of the file. If you make changes to these files
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then you should also check in the fix to Classpath. For small changes
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it may be easier to send a patch to the classpath mailinglist. For
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large changes, if you have direct write access to the libgcj tree,
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then you will also need to get a Classpath account and do the work
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yourself.
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<http://mail.gnu.org/mailman/listinfo/classpath/>
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<mailto:classpath@gnu.org>
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If you merge a libgcj class with a classpath class then you must update the
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copyright notice at the top of the file so others can see that this is a
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shared libgcj/classpath file.
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--
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If you need to add new java files to libgcj then you have to edit the
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Makefile.am file in the top (libjava) directory. And run automake.
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But note the following (thanks to Bryce McKinlay):
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> Do you know the magic dance I have to do when adding files to Makefile.am
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> so they will appear in Makefile.in and finally in the user generated
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> Makefile?
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Yup, you need the magic libgcj automake ;-)
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<ftp://ftp.freesoftware.com/.0/sourceware/java/automake-gcj-1.4.tar.gz>
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Install that (don't worry, it should still work for other projects), add your
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files to the Makefile.am, then just type "automake" and it will regenerate the
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Makefile.in. Easy!
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Tom Tromey adds:
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If you add a class to java.lang, java.io, or java.util
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(including sub-packages, like java.lang.ref).
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* Edit gcj/javaprims.h
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* Go to the `namespace java' line, and delete that entire block (the
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entire contents of the namespace)
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* Then insert the output of `perl ../scripts/classes.pl' into the file
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at that point.
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If you're generating a patch there is a program you can get to do an
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offline `cvs add' (it will fake an `add' if you don't have write
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permission yet). Then you can use `cvs diff -N' to generate the
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patch. See http://www.red-bean.com/cvsutils/
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