The Open Group Base Specifications Issue 7
IEEE Std 1003.1-2008, 2016 Edition
Copyright © 2001-2016 The IEEE and The Open Group

#### NAME

> cxref - generate a C-language program cross-reference table (DEVELOPMENT)

#### SYNOPSIS

> ``[XSI] cxref` [`-cs`] [`-o` file] [`-w` num] [`-D` name[`=`def]]`...` [`-I` dir]`...
> ` [`-U` name]`...` file`...``

#### DESCRIPTION

> The cxref utility shall analyze a collection of C-language files and attempt to build a cross-reference table. Information from #define lines shall be included in the symbol table. A sorted listing shall be written to standard output of all symbols (auto, static, and global) in each file separately, or with the -c option, in combination. Each symbol shall contain an <asterisk> before the declaring reference.

#### OPTIONS

> The cxref utility shall conform to XBD Utility Syntax Guidelines, except that the order of the -D, -I, and -U options (which are identical to their interpretation by c99) is significant. The following options shall be supported:

> -c
>   Write a combined cross-reference of all input files.
> -s
>   Operate silently; do not print input filenames.
> -o file
>   Direct output to named file.
> -w num
>   Format output no wider than num (decimal) columns. This option defaults to 80 if num is not specified or is less than 51.
> -D
>   Equivalent to c99.
> -I
>   Equivalent to c99.
> -U
>   Equivalent to c99.

#### OPERANDS

> The following operand shall be supported:

> file
>   A pathname of a C-language source file.

#### STDIN

> Not used.

#### INPUT FILES

> The input files are C-language source files.

#### ENVIRONMENT VARIABLES

> The following environment variables shall affect the execution of cxref:

> LANG
>   Provide a default value for the internationalization variables that are unset or null. (See XBD Internationalization Variables for the precedence of internationalization variables used to determine the values of locale categories.)
> LC_ALL
>   If set to a non-empty string value, override the values of all the other internationalization variables.
> LC_COLLATE
>   Determine the locale for the ordering of the output.
> LC_CTYPE
>   Determine the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte as opposed to multi-byte characters in arguments and input files).
> LC_MESSAGES
>   Determine the locale that should be used to affect the format and contents of diagnostic messages written to standard error.
> NLSPATH
>   Determine the location of message catalogs for the processing of LC_MESSAGES.

#### ASYNCHRONOUS EVENTS

> Default.

#### STDOUT

> The standard output shall be used for the cross-reference listing, unless the -o option is used to select a different output file.

> The format of standard output is unspecified, except that the following information shall be included:

> - If the -c option is not specified, each portion of the listing shall start with the name of the input file on a separate line.

> - The name line shall be followed by a sorted list of symbols, each with its associated location pathname, the name of the function in which it appears (if it is not a function name itself), and line number references.

> - Each line number may be preceded by an <asterisk> ( `'*'` ) flag, meaning that this is the declaring reference. Other single-character flags, with implementation-defined meanings, may be included.

#### STDERR

> The standard error shall be used only for diagnostic messages.

#### OUTPUT FILES

> The output file named by the -o option shall be used instead of standard output.

#### EXTENDED DESCRIPTION

> None.

#### EXIT STATUS

> The following exit values shall be returned:

> 0
>   Successful completion.
> >0
>   An error occurred.

#### CONSEQUENCES OF ERRORS

> Default.

The following sections are informative.

#### APPLICATION USAGE

> None.

#### EXAMPLES

> None.

#### RATIONALE

> None.

#### FUTURE DIRECTIONS

> None.

#### SEE ALSO

> c99

> XBD Environment Variables, Utility Syntax Guidelines

#### CHANGE HISTORY

> First released in Issue 2.

#### Issue 5

> In the SYNOPSIS, [ -U dir] is changed to [ -U name].

#### Issue 6

> The APPLICATION USAGE section is added.

#### Issue 7

> SD5-XCU-ERN-97 is applied, updating the SYNOPSIS.

End of informative text.

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