Provided by: gcj-4.8-jre-headless_4.8.2-19ubuntu1_amd64 bug


       gcj-dbtool - Manipulate class file mapping databases for libgcj


       gcj-dbtool OPTION DBFILE [MORE] ...

       gcj-dbtool [-0] [-] [-n] [-a] [-f]
         [-t] [-l] [-p [LIBDIR]]
         [-v] [-m] [--version] [--help]


       "gcj-dbtool" is a tool for creating and manipulating class file mapping databases.
       "libgcj" can use these databases to find a shared library corresponding to the bytecode
       representation of a class.  This functionality is useful for ahead-of-time compilation of
       a program that has no knowledge of "gcj".

       "gcj-dbtool" works best if all the jar files added to it are compiled using

       Note that "gcj-dbtool" is currently available as "preview technology".  We believe it is a
       reasonable way to allow application-transparent ahead-of-time compilation, but this is an
       unexplored area.  We welcome your comments.


       -n DBFILE [SIZE]
           This creates a new database.  Currently, databases cannot be resized; you can choose a
           larger initial size if desired.  The default size is 32,749.

           This adds a jar file to the database.  For each class file in the jar, a cryptographic
           signature of the bytecode representation of the class is recorded in the database.  At
           runtime, a class is looked up by its signature and the compiled form of the class is
           looked for in the corresponding shared library.  The -a option will verify that LIB
           exists before adding it to the database; -f skips this check.

       [-][-0] -m DBFILE DBFILE,[DBFILE]
           Merge a number of databases.  The output database overwrites any existing database.
           To add databases into an existing database, include the destination in the list of

           If - or -0 are used, the list of files to read is taken from standard input instead of
           the command line.  For -0, Input filenames are terminated by a null character instead
           of by whitespace.  Useful when arguments might contain white space.  The GNU find
           -print0 option produces input suitable for this mode.

       -t DBFILE
           Test a database.

       -l DBFILE
           List the contents of a database.

       -p  Print the name of the default database.  If there is no default database, this prints
           a blank line.  If LIBDIR is specified, use it instead of the default library directory
           component of the database name.

           Print a help message, then exit.

       -v  Print version information, then exit.


       gcc(1), gcj(1), gcjh(1), jcf-dump(1), gfdl(7), and the Info entries for gcj and gcc.


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       (a) The FSF's Front-Cover Text is:

            A GNU Manual

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