PROLOG

       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of this interface
       may differ (consult the corresponding Linux manual page for details of Linux behavior), or the  interface
       may not be implemented on Linux.

NAME

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

SYNOPSIS

       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 the Base Definitions volume of  POSIX.1‐2008,  Section  12.2,  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 the
                 Base Definitions volume of POSIX.1‐2008, Section 8.2, 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

       The Base Definitions volume of POSIX.1‐2008, Chapter 8,  Environment  Variables,  Section  12.2,  Utility
       Syntax Guidelines

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition,
       Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open  Group  Base
       Specifications  Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers, Inc
       and The Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In  the  event
       of  any  discrepancy between this version and the original IEEE and The Open Group Standard, the original
       IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at
       http://www.unix.org/online.html .

       Any  typographical  or formatting errors that appear in this page are most likely to have been introduced
       during  the  conversion  of  the  source  files  to  man  page  format.  To  report  such   errors,   see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .