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Cross-Compilation Options in the SQLJ Command Line Translator

By default, classes are compiled against the bootstrap and extension classes of the platform that javac shipped with. But javac also supports cross-compiling, where classes are compiled against a bootstrap and extension classes of a different Java platform implementation. It is important to use -bootclasspath and -extdirs when cross-compiling.

      -target <version>
            Generate class files that will work on VMs with the specified version. The default is to generate class files to
            be compatible with both 1.1 VMs and VMs in the Java 2 SDK. The versions supported by javac in the Java 2
            SDK are:

            1.1
                  Ensure that generated class files will be compatible with 1.1 and VMs in the Java 2 SDK. This is the
                  default.
            1.2
                  Generate class files that will run on VMs in the Java 2 SDK, v 1.2 and later, but will not run on 1.1 VMs.
            1.3
                  Generate class files that will run on VMs in the Java 2 SDK, v 1.3 and later, but will not run on 1.1 or 1.2
                  VMs.

      -bootclasspath <bootclasspath>
            Cross-compile against the specified set of boot classes. As with the user class path, boot class path entries
            are separated by colons (:) and can be directories, JAR archives, or ZIP archives.

      -extdirs <directories>
            Cross-compile against the specified extension directories. Directories is a colon-separated list of directories.
            Each JAR archive in the specified directories is searched for class files.

The SQLJ command line translator allows the user to specify these three options using the following -C syntax options:

• -C-bootclasspath <boot classpath>
• -C-target <version>
• -C-extdirs <directories>

% sqlj -vm=/usr/local/packages/jdk1.2.2/bin/java\
-compiler-executable=/usr/local/packages/jdk1.2.2/bin/javac\
-C-bootclasspath /usr/local/packages/jdk1.3.1/jre/lib/rt.jar \
-C-extdirs "" -C-target 1.1.8 Demo.sqlj

Note: The cross-compiler options can only be used when the SQLJ translator uses the Java compiler in Java 2 SDK v 1.2 or later. The Java compiler used by the SQLJ translator is determined by the system environment, e.g., the PATH enviroment in Solaris, or by the SQLJ -compiler-executable option.