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.
The cxref utility shall conform to the Base Definitions volume of
IEEE Std 1003.1-2001, 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:
Write a combined cross-reference of all input files.
Operate silently; do not print input filenames.
Direct output to named file.
Format output no wider than num (decimal) columns.
This option defaults to 80 if num is not specified or is less than
The following environment variables shall affect the execution of cxref:
Provide a default value for the internationalization
variables that are unset or null. (See the Base Definitions volume of
IEEE Std 1003.1-2001, Section 8.2, Internationalization
Variables for the precedence of internationalization variables used to
determine the values of locale categories.)
If set to a non-empty string value, override the values of
all the other internationalization variables.
Determine the locale for the ordering of the output.
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).
Determine the locale that should be used to affect the
format and contents of diagnostic messages written to standard error.
Determine the location of message catalogs for the
processing of LC_MESSAGES.
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
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
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 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