155 lines
3.6 KiB
Groff
155 lines
3.6 KiB
Groff
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.TH LINT 1 88/2/22
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.SH NAME
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lint \- a C program checker
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.SH SYNOPSIS
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.B lint
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[
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.B \-abhuvx \-KR
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]
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[file | libname
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.BR \-l xxx
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] ...
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.br
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.B lint
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.BR \-L libname
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[file | libname2 ] ...
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.br
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.SH DESCRIPTION
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.I Lint
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does an extensive consistency and plausibility check on a set of C
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program files.
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When it detects a doubtful construction
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(which need not be an error) it gives a warning.
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.I Lint
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does a full flow-of-control check, except that
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.BR goto s
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are not followed and non-termination of functions is not propagated.
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If, however, no
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.BR goto s
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are used, each call to a non-terminating function is followed by
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/*NOTREACHED*/ and each switch has a default clause (possibly consisting
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of /*NOTREACHED*/), the initialization state of all local variables will
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be checked correctly.
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.PP
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The second command is used to maintain lint libraries; these are ASCII files
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that contain the output of the first pass.
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A library name must start with
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.B llib\-l
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and cannot end in
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.BR .c .
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A lint user library can be created and updated by using the
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.B \-L
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option. The
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.I libname
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must be a local file and can be passed to
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.I lint
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again as a normal argument.
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.PP
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Standard libraries are searched using the
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.B \-l
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option; their format is identical to that of the user library files.
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Possibilities are
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.BR \-lm ,
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.B \-ltermcap
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and
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.BR \-lcurses .
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.B \-lc
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is default; a single
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.B \-l
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tells
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.I lint
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not to use the standard C library.
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.PP
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The
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.BR \-D ,
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.B \-U
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and
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.B \-I
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options are recognized as separate arguments. The
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.B \-KR
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option tells
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.I lint
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to check strictly according to Kernighan & Ritchie; since
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.I lint
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is trying to be helpful rather than obnoxious, this is not the default.
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.PP
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.I Lint
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understands the following additional options:
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.TP
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.B a
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Warn about conversions that may cause a loss of precision.
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.TP
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.B b
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Do not report not-reachable
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.I break
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statements.
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This flag may be useful when
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.I lint
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is run on a generated source file.
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.TP
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.B h
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Signal "null effects", possible pointer alignment problems and unexpected
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constructs. Report definitions of variables that have a scope wider than
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necessary: extern variables that are used in one file only, automatic
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variables that could be more local.
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.TP
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.B u
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Do not complain about unused and undefined functions and global variables.
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.TP
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.B v
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Do not warn about unused arguments of functions.
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.TP
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.B x
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Complain about unused external variables.
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.PP
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In some cases where the programmer knows that a construction is questionable
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but nevertheless correct, a pseudo-comment can be used to silence
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.IR lint ;
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the comments recognized are:
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.TP
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/* VARARGS\fIn\fR */
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The next function can be called with a variable number of
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arguments.
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Only check the types of the first \fIn\fR arguments.
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The \fIn\fR must follow the word VARARGS immediately.
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.TP
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/* VARARGS */
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Same as /* VARARGS0 */
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.TP
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/* ARGSUSED */
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Do not warn about arguments not used in the next function
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(see also the \-\fBv\fR option).
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.TP
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/* NOTREACHED */
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This tells
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.I lint
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that the flow of control "cannot reach" this comment.
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This is a way to tell
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.I lint
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that a statement never "returns".
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.TP
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/* LINTLIBRARY */
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The following definitions are assumed to be part of a library.
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It suppresses complaints about unused functions and variables
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and is used in the creation of lint libraries.
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.SH FILES
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.IP ???/lnt 35
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first pass
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.IP ???/lpass2/lpass2
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second pass
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.IP ???/llib/llib\-l*
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lint libraries
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.SH SEE ALSO
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|
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cem(1)
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.br
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|
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Frans Kunst,
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|
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.I Lint, a C Program Checker
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|
|
.SH BUGS
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Conflicting options in the command line are not detected.
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.br
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After a label, all automatic variables are assumed initialized.
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.br
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Initializations hidden inside for statements are sometimes overlooked.
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.SH AUTHOR
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Frans Kunst, Vrije Universiteit, Amsterdam.
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