Ubuntu Manpage: gtags - create tag files for global

NAME

       gtags - create tag files for global

SYNOPSIS

       gtags [-ciIOqvw][-d tag-file][-f file][dbpath]

DESCRIPTION

       Gtags is used to create tag files for global(1).

       Gtags  recursively collects source files under the current directory, picks up symbols and
       writes the cross-reference data into the tag files (´GTAGS´, ´GRTAGS´ and ´GPATH´).

       If ´gtags.files´ exists in the current directory or a file is specified by the -f  option,
       target files are limited by it. Lines starting with ´. ´ are comments.

       C, yacc, Assembly, Java, C++ and PHP source files are supported.  Files whose names end in
       ´.c´, ´.h´ are assumed to be C source files.  Files whose names end in ´.y´ are assumed to
       be  yacc  source  files.   Files  whose names end in ´.s´, ´.S´ are assumed to be Assembly
       source files.  Files whose names end in ´.java´ are  assumed  to  be  Java  source  files.
       Files  whose names end in ´.c++´, ´.cc´, ´.hh´, ´.cpp´, ´.cxx´, ´.hxx´, ´.hpp´, ´.C´, ´.H´
       are assumed to be C++ source files.  Files whose names end in  ´.php´,  ´.php3´,  ´.phtml´
       are  assumed to be PHP source files.  Other files are assumed to be text files. Gtags does
       not treat binary files.

OPTIONS

The following options are available:

--accept-dotfiles
Accept files and directories whose names begin with a dot. By default, gtags
ignores them.

-c, --compact
Make ´GTAGS´ in compact format. This option does not influence ´GRTAGS´, because
that is always made in compact format.

--config[=name]
Print the value of config variable name. If name is not specified then print all
names and values. In addition to the variables listed in the ENVIRONMENT section,
you can refer to install directories by read only variables: bindir, libdir,
datadir, localstatedir and sysconfdir.

-d, --dump tag-file
Dump a tag file as text to the standard output. Output format is ´key<tab>data'.
This is for debugging.

--explain
Explain handling files.

-f, --file file
Give a list of candidates of target files. Files which are not on the list are
ignored. The argument file can be set to ´-´ to accept a list of files from the
standard input. File names must be separated by newline. To make the list you may
use find(1), which has rich options for selecting files.

--gtagsconf file
Set environment variable GTAGSCONF to file.

--gtagslabel label
Set environment variable GTAGSLABEL to label.

-I, --idutils
In addition to tag files, make ID database for idutils(1).

-i, --incremental
Update tag files incrementally. It's better to use global(1) with the -u command.

-O, --objdir
Use BSD-style objdir as the location of tag files. If ´$MAKEOBJDIRPREFIX´
directory exists, gtags creates ´$MAKEOBJDIRPREFIX/<current directory>´ directory
and makes tag files in it. If dbpath is specified, this option is ignored.

--single-update file
Update tag files for a single file. It is considered that file was added, updated
or deleted, and there is no change in other files. This option implies the -i
option.

--skip-unreadable
Skip unreadable files.

--sqlite3
Use Sqlite 3 API to make tag files. By default, BSD/DB 1.85 API is used. To use
this option, you need to invoke configure script with --with-sqlite3 in the build
phase.

--statistics
Print statistics information.

-q, --quiet
Quiet mode.

-v, --verbose
Verbose mode.

-w, --warning
Print warning messages.

dbpath The directory in which tag files are generated. The default is the current
directory.

EXAMPLES

       $ ls -F
       Makefile      src/    lib/
       $ gtags -v
       $ global -x main
       main              10 src/main.c  main (argc, argv) {

FILES

       ´GTAGS´
              Tag file for definitions.

       ´GRTAGS´
              Tag file for references.

       ´GPATH´
              Tag file for source files.

       ´gtags.conf´, ´$HOME/.globalrc´
              Configuration data for GNU GLOBAL.  See gtags.conf(5).

       ´gtags.files´
              The list of candidates of target files.

       ´.notfunction´
              The list of symbols which is not a definition.  If this file exists in the  project
              root  directory,  gtags  does  not  regard  the  symbols  listed  in  this  file as
              definitions.

ENVIRONMENT

The following environment variables affect the execution of gtags:

GTAGSCACHE
The size of the B-tree cache. The default is 50000000 (bytes).

GTAGSCONF
Configuration file.

GTAGSFORCECPP
If this variable is set, each file whose suffix is ´.h´ is treated as a C++ source
file.

GTAGSFORCEENDBLOCK
If this variable is set, each } at the first column brings end of block of 0 level.

GTAGSLABEL
Configuration label. The default is ´default´.

GTAGSLOGGING
If this variable is set, ´$GTAGSLOGGING´ is used as the path name of a log file.
There is no default value.

GTAGS_COMMANDLINE
This variable can only be referenced from the hook (see gtags_hook). Gtags sets
its own effective command line to this variable before calling the hook. Each
argument is separated by whitespace, and real whitespace is represented as '%20'.
This is read only.

GTAGS_OPTIONS
The value of this variable is inserted in the head of arguments.

MAKEOBJDIR
If this variable is set, ´$MAKEOBJDIR´ is used as the name of BSD-style objdir. The
default is ´obj´.

MAKEOBJDIRPREFIX
If this variable is set, ´$MAKEOBJDIRPREFIX´ is used as the prefix of BSD-style
objdir. The default is ´/usr/obj´.

TMPDIR The location used to stored temporary files. The default is ´/tmp´.

CONFIGURATION

The following configuration variables affect the execution of gtags. You can see the
default value for each variable with the --config option.

gtags_parser (comma separated list)
Specify the mapping of language names and plug-in parsers. Each part delimited by
the comma consists of a language name, a colon, the shared object path, an optional
colon followed by a function name. If the function name is not specified, 'parser'
is assumed. As a special exception, gtags collects values from multiple
gtags_parser variables. For these mappings, the first match is adopted.

gtags_hook (command line)
Specify a command line which should be executed at the beginning of gtags after
loading configuration file. You can use this hook to update ´gtags.files´
dynamically. "./" in it always means the project root directory, since gtags is
always invoked there.

icase_path (boolean)
Ignore case distinctions in the path. Suffixes check is affected by this
capability.

langmap (comma separated list)
Language mapping. Each comma-separated map consists of a language name, a colon,
and a list of file extensions. You can specify a glob pattern surrounded by
parentheses instead of an extension for the files without extensions (e.g.
Make:([Mm]akefile).mak.mk). As a special exception, gtags collects values from
multiple langmap variables. For these mappings, the first match is adopted.
Default mapping is:
´c:.c.h,yacc:.y,asm:.s.S,java:.java,cpp:.c++.cc.hh.cpp.cxx.hxx.hpp.C.H,php:.php.php3.phtml´.

skip (comma separated list)
Gtags skips files and directories which are given in this list. As a special
exception, gtags collects values from multiple skip variables. If the value ends
with ´/´, it is assumed as a directory and gtags skips all files under it. The
value may include glob patterns (*, ?, [...], [!...], [^...]).

If the value starts with ´/´, it is assumed a relative path name from the root
directory of the project. You cannot use glob patterns for a path name. However,
this direction is out-of-date, and is not recommended. Instead, you can use -f
option which can be combined with find(1). Since find(1) has rich options to select
files, you can do everything. Additionally, this technique can also be applied to
any other tagging systems like ctags(1), cscope(1), etc.

Skip list is also effective when you use the -f or ´gtags.files´.

DIAGNOSTICS

       Gtags exits with a non-0 value if an error occurred, 0 otherwise.

       Note that files created by gtags with a non-zero exit code should be considered corrupted.

BUG

       ´GTAGS´ and ´GRTAGS´ are very large.  In advance of using this command, check the space of
       your disk.

       Assembly  support  is  far  from  complete.   It extracts only ENTRY() and ALTENTRY() from
       source file.  Probably valid only for FreeBSD and Linux kernel source.

       There is no concurrency control about tag files.

AUTHOR

       Shigio YAMAGUCHI, Hideki IWAMOTO and others.

HISTORY

       The gtags command appeared in FreeBSD 2.2.2.