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lint(1)								       lint(1)

Name
       lint - check C code

Syntax
       lint [Options] file...

Description
       The command detects features of the C program files which are likely to
       be bugs, non-portable, or wasteful.  It also checks the type  usage  of
       the  program  more strictly than the compilers.	Among the things which
       are currently found are unreachable statements, loops  not  entered  at
       the top, automatic variables declared and not used, and logical expres‐
       sions whose value is constant.  Moreover, the  usage  of	 functions  is
       checked to find functions which return values in some places and not in
       others, functions called with varying numbers of arguments,  and	 func‐
       tions whose values are not used.

       By default, it is assumed that all the files are to be loaded together;
       they are checked for mutual compatibility.   Function  definitions  for
       certain libraries are available to These libraries are referred to by a
       conventional name, such as `-lm', in the style of Arguments  ending  in
       .ln are also treated as library files.

       To create libraries, use the -C option as follows:
       lint -Cdlib files . . .

       The  C  sources	of  library dlib are files.  The result is the library
       file llib-ldlib.ln in the correct library format suitable  for  linting
       programs	 using	dlib.  Note that if you have set the System V environ‐
       ment variable, the System V lint library is used.  For further informa‐
       tion, see

Options
       Any  number  of the options in the following list may be used.  The -D,
       -U, and -I options of are also recognized as separate arguments.

       -a   Report assignments of long values to int variables.

       -b   Report break statements that cannot be reached.  (This is not  the
	    default  because most and many outputs produce dozens of such com‐
	    ments.)

       -c   Complain about casts that have questionable portability.

       -h   Apply a number of heuristic tests to attempt to find bugs, improve
	    style, and reduce waste.

       -n   Do not check compatibility against the standard library.

       -p   Attempt to check portability to the IBM and GCOS dialects of C.

       -u   Do	not  complain  about  functions	 and  variables	 used  and not
	    defined, or defined and not used.  (This is suitable  for  running
	    on a subset of files out of a larger program.)

       -v   Suppress complaints about unused arguments in functions.

       -x   Report  variables  referred	 to  be extern declarations, but never
	    used.

       -Yenvironment
	    Compile C programs for environment.	 If environment is SYSTEM_FIVE
	    or	omitted,  defines SYSTEM_FIVE for the preprocessor, and if the
	    loader is invoked, specifies that the System V version  of	the  C
	    runtime  library  is used.	Also, if the math library is specified
	    with the -lm option, the System V version is used.	If environment
	    is	POSIX, defines POSIX for the preprocessor.  If the environment
	    variable PROG_ENV has the value SYSTEM_FIVE or POSIX,  the	effect
	    is	the  same as specifying the corresponding -Yenvironment option
	    to The -Y option overrides the PROG_ENV  variable;	-YBSD  can  be
	    used to override all special actions.

       -z   Do not complain about structures that are never defined (for exam‐
	    ple, using a structure pointer without knowing its contents.)

Restrictions
       The system calls and other functions that do not return are not	under‐
       stood; this causes various anomalies in output.

       Certain conventional comments in the C source change the behavior of

       /*NOTREACHED*/	   At	appropriate   points,	stops  comments	 about
			   unreachable code.

       /*VARARGSn*/	   Suppresses the usual checking for variable  numbers
			   of arguments in the following function declaration.
			   The	data  types  of	 the  first  n	arguments  are
			   checked; a missing n is taken to be 0.

       /*NOSTRICT*/	   Shuts  off strict type checking in the next expres‐
			   sion.

       /*ARGSUSED*/	   Turns on the -v option for the next function.

       /*LINTLIBRARY*/	   At the beginning of a file,	shuts  off  complaints
			   about unused functions in this file.

Files
       /usr/lib/lint1
			   Program

       /usr/lib/lint2
			   Program

       /usr/lib/lint/llib-lc.ln
			   Declarations for standard functions

       /usr/lib/lint/llib-lc
			   Human readable version of above

       /usr/lib/lint/llib-lcV.ln
			   System V declarations for standard functions

       /usr/lib/lint/llib-lcP.ln
			   POSIX declarations for standard functions

       /usr/lib/lint/llib-port.ln
			   Declarations for portable functions

       /usr/lib/lint/llib-port
			   Human readable . . .

       llib-l*.ln
			   Library created with -C

See Also
       cc(1)

       ``Lint,	a  C  Program  Checker'', ULTRIX Supplementary Documents, Vol.
       II:Programmer

				      VAX			       lint(1)
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