"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
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.
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.
-a DBFILE JARFILE LIB-f DBFILE JARFILE LIB
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 sources.
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
Test a database.
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
Print a help message, then exit.
--version-v Print version information, then exit.
Copyright (c) 2001-2016 Free Software Foundation, Inc.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation; with no
Invariant Sections, the Front-Cover Texts being (a) (see below), and
with the Back-Cover Texts being (b) (see below). A copy of the
license is included in the man page gfdl(7).
(a) The FSF's Front-Cover Text is:
A GNU Manual
(b) The FSF's Back-Cover Text is:
You have freedom to copy and modify this GNU Manual, like GNU
software. Copies published by the Free Software Foundation raise
funds for GNU development.
This page is part of the gcc (GNU Compiler Collection) project.
Information about the project can be found at ⟨http://gcc.gnu.org/⟩.
If you have a bug report for this manual page, see
⟨http://gcc.gnu.org/bugs/⟩. This page was obtained from the tarball
gcc-6.3.0.tar.gz fetched from
⟨ftp://ftp.fu-berlin.de/unix/languages/gcc/releases/⟩ on 2017-03-13.
If you discover any rendering problems in this HTML version of the
page, or you believe there is a better or more up-to-date source for
the page, or you have corrections or improvements to the information
in this COLOPHON (which is not part of the original manual page),
send a mail to email@example.com
gcc-6.3.0 2016-12-21 GCJ-DBTOOL(1)