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.1‐2017, 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.1‐2017,   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.1‐2017, 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
       1003.1-2017,  Standard  for  Information Technology -- Portable Operating System Interface
       (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C)  2018  by
       the  Institute  of  Electrical  and Electronics Engineers, Inc and The Open Group.  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.opengroup.org/unix/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 .