CXREF(1P) POSIX Programmer's Manual CXREF(1P)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.
NAMEcxref — generate a C-language program cross-reference table (DEVELOP‐
SYNOPSIScxref [−cs] [−o file] [−w num] [−D name[=def]]... [−I dir]...
[−U name]... file...
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 sym‐
bol shall contain an <asterisk> before the declaring reference.
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
−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
−D Equivalent to c99.
−I Equivalent to c99.
−U Equivalent to c99.
The following operand shall be supported:
file A pathname of a C-language source file.
The input files are C-language source files.
The following environment variables shall affect the execution of
LANG Provide a default value for the internationalization vari‐
ables that are unset or null. (See the Base Definitions vol‐
ume of POSIX.1‐2008, Section 8.2, Internationalization Vari‐
ables 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.
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
Determine the locale that should be used to affect the format
and contents of diagnostic messages written to standard
NLSPATH Determine the location of message catalogs for the processing
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
* Each line number may be preceded by an <asterisk> ('*') flag, mean‐
ing that this is the declaring reference. Other single-character
flags, with implementation-defined meanings, may be included.
The standard error shall be used only for diagnostic messages.
The output file named by the −o option shall be used instead of stan‐
The following exit values shall be returned:
0 Successful completion.
>0 An error occurred.
CONSEQUENCES OF ERRORS
The following sections are informative.
The Base Definitions volume of POSIX.1‐2008, Chapter 8, Environment
Variables, Section 12.2, Utility Syntax Guidelines
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 Electri‐
cal 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 .
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IEEE/The Open Group 2013 CXREF(1P)