The GCJ home page
What is it?
We've written a front end to the GCC compiler which can natively
compile both Javatm source and
bytecode files. The compiler can also generate class files. This new
front end is integrated into the GCC project.
What you get
The currently available code consists of several programs:
- gcj
-
A front end to gcc which is able to read Java ``.class'' files and
generate assembly code. gcj is also a convenient front end to
jvgenmain. Finally, gcj can read ``.java'' files and generate
assembly code or Java bytecode.
- jvgenmain
-
A small program to generate an appropriate ``main'' for a Java class.
- gcjh
-
A program to generate C++ header files corresponding to Java
.class files.
- jcf-dump
-
Reads a ``.class'' file and prints out all sorts of useful
information.
- jv-scan
-
Reads a ``.java'' file and prints some useful information.
For instance, it can tell you which classes are defined in that file.
Making executables
In order to make full executables, you'll need to link the
output of gcj with the appropriate runtime code. See the libgcj page for details on the runtime.
Note that you'll want to configure GCC to build libjava; see
configuration and build instructions
for GCJ.
There are also more detailed
instructions on compiling Java programs.
How to get it
The new Java front end is very easy to download and install. Since
it is it fully integrated into GCC, you can simply follow the GCC download and build
instructions. Note that you'll want to configure GCC to use the
appropriate threads system; see the libgcj page for details.
How to try it
Once you've downloaded and installed gcj and libgcj, it is very
easy to try a small Java program of your own:
gcj --main=HelloWorld -o HelloWorld HelloWorld.java
./HelloWorld
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