127 lines
4.5 KiB
Plaintext
127 lines
4.5 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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libgcj uses GNU Classpath as an upstream provider. Snapshots of
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Classpath are imported into the libgcj source tree. Some classes are
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overridden by local versions; these files still appear in the libgcj
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tree.
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To import a new release:
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- Check out a classpath snapshot or take a release tar.gz file.
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I use 'cvs export' for this. Make a tag to ensure future hackers
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know exactly what revision was checked out; tags are of the form
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'libgcj-import-DATE'.
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- Get a svn checkout of
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svn+ssh://gcc.gnu.org/svn/gcc/branches/CLASSPATH/libjava/classpath
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this contains "pure" GNU Classpath inside the GCC tree.
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- Clean it up and get the files from a new version:
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- find classpath -type f | grep -v /\.svn | grep -v /\.cvs
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- tar zxf classpath-x.tar.gz
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- cp -r classpath-x/* classpath
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- Add/Remove files:
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- svn status classpath | grep ^\! | cut -c8- | xargs svn remove
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- svn status classpath | grep ^\? | cut -c8- | xargs svn add
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- If there are any empty directories now they can be removed.
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- Update vendor branch
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- svn commit classpath
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- Note the new revision number (Xrev)
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- Get a fresh svn trunk checkout and cd gcc/libjava
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- Merge the changes between classpath versions into the trunk.
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svn merge -rXrev-1:Xrev \
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svn+ssh://gcc.gnu.org/svn/gcc/branches/CLASSPATH/libjava/classpath \
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classpath
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- Resolve any conflicts pointed out by svn status classpath | grep ^C
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- Makefile.in files will be regenerated in the next step.
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- Other files should have a "GCJ LOCAL" comment, and/or are mentioned
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in the classpath/ChangeLog.gcj file.
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(Don't forget to svn resolved files.)
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- Use auto* to create configure, Makefile.in, etc
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Make sure you have Automake 1.9.3 installed. Exactly that version!
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You have to make sure to use the gcc libtool.m4 and gcc lt* scripts
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cd .../classpath
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cp ../../lt* .
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cp ../../config.sub ../../config.guess .
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aclocal -I m4 -I ../..
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autoconf
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autoheader
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automake
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rm -rf autom4te.cache
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cd ..
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scripts/makemake.tcl > sources.am
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automake
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- Build, fix, till everything works.
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Possibly update the gcj/javaprims.h file with scripts/classes.pl
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(See below, it can only be done after the first source->bytecode
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pass has finished.)
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Over time we plan to remove as many of the remaining divergences as
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possible.
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File additions and deletions require running scripts/makemake.tcl
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before running automake.
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--
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In general you should not make any changes in the classpath/
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directory. Changes here should come via imports from upstream.
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However, there are two (known) exceptions to this rule:
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* In an emergency, such as a bootstrap breakage, it is ok to commit a
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patch provided that the problem is resolved (by fixing a compiler
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bug or fixing the Classpath bug upstream) somehow and the resolution
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is later checked in (erasing the local diff).
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* On a release branch to fix a bug, where a full-scale import of
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Classpath is not advisable.
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--
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You can develop in a GCC tree using a CVS checkout of Classpath, most
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of the time. (The exceptions are when an incompatible change has been
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made in Classpath and some core part of libgcj has not yet been
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updated.)
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The way to set this up is very similar to importing a new version of
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Classpath into the libgcj tree. In your working tree:
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* cd gcc/libjava; rm -rf classpath
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* cvs co classpath
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* cd classpath
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Now run the auto tools as specified in the import process; then
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cd ..
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* Run 'scripts/makemake.tcl > sources.am' in the source tree
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* Run automake for libgcj
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Now you should be ready to go.
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If you are working in a tree like this, you must remember to run
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makemake.tcl and automake whenever you update your embedded classpath
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tree.
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--
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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. This must be run from the build tree, in
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<build>/classpath/lib; it uses the .class file name to determine
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what to print.
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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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