B::Lint man page on BSDOS

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B::Lint(3)	 Perl Programmers Reference Guide      B::Lint(3)

NAME
       B::Lint - Perl lint

SYNOPSIS
       perl -MO=Lint[,OPTIONS] foo.pl

DESCRIPTION
       The B::Lint module is equivalent to an extended version of
       the -w option of perl. It is named after the program lint
       which carries out a similar process for C programs.

OPTIONS AND LINT CHECKS
       Option words are separated by commas (not whitespace) and
       follow the usual conventions of compiler backend options.
       Following any options (indicated by a leading -) come lint
       check arguments. Each such argument (apart from the
       special all and none options) is a word representing one
       possible lint check (turning on that check) or is no-foo
       (turning off that check). Before processing the check
       arguments, a standard list of checks is turned on. Later
       options override earlier ones. Available options are:

       context Produces a warning whenever an array is used in an
	       implicit scalar context. For example, both of the
	       lines

		   $foo = length(@bar);
		   $foo = @bar;
	       will elicit a warning. Using an explicit B<scalar()> silences the
	       warning. For example,

		   $foo = scalar(@bar);

       implicit-read and implicit-write
	       These options produce a warning whenever an
	       operation implicitly reads or (respectively)
	       writes to one of Perl's special variables.  For
	       example, implicit-read will warn about these:

		   /foo/;

	       and implicit-write will warn about these:

		   s/foo/bar/;

	       Both implicit-read and implicit-write warn about
	       this:

		   for (@a) { ... }

       dollar-underscore
	       This option warns whenever $_ is used either

16/Sep/1999	       perl 5.005, patch 03			1

B::Lint(3)	 Perl Programmers Reference Guide      B::Lint(3)

	       explicitly anywhere or as the implicit argument of
	       a print statement.

       private-names
	       This option warns on each use of any variable,
	       subroutine or method name that lives in a non-
	       current package but begins with an underscore
	       ("_"). Warnings aren't issued for the special case
	       of the single character name "_" by itself (e.g.
	       $_ and @_).

       undefined-subs
	       This option warns whenever an undefined subroutine
	       is invoked.  This option will only catch
	       explicitly invoked subroutines such as foo() and
	       not indirect invocations such as &$subref() or
	       $obj->meth(). Note that some programs or modules
	       delay definition of subs until runtime by means of
	       the AUTOLOAD mechanism.

       regexp-variables
	       This option warns whenever one of the regexp
	       variables $', $& or $' is used. Any occurrence of
	       any of these variables in your program can slow
	       your whole program down. See the perlre manpage
	       for details.

       all     Turn all warnings on.

       none    Turn all warnings off.

NON LINT-CHECK OPTIONS
       -u Package
	       Normally, Lint only checks the main code of the
	       program together with all subs defined in package
	       main. The -u option lets you include other package
	       names whose subs are then checked by Lint.

BUGS
       This is only a very preliminary version.

AUTHOR
       Malcolm Beattie, mbeattie@sable.ox.ac.uk.

16/Sep/1999	       perl 5.005, patch 03			2

B::Lint(3)	 Perl Programmers Reference Guide      B::Lint(3)

16/Sep/1999	       perl 5.005, patch 03			3

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