MirOS Manual: B::Lint(3p)


ext::B::B::Lint(3Perl Programmers Reference Guext::B::B::Lint(3p)

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 stan-
     dard 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 scalar()
             silences the warning. For example,

                 $foo = scalar(@bar);

     implicit-read and implicit-write
             These options produce a warning whenever an opera-
             tion 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) { ... }

     bare-subs

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             This option warns whenever a bareword is implicitly
             quoted, but is also the name of a subroutine in the
             current package. Typical mistakes that it will trap
             are:

                 use constant foo => 'bar';
                 @a = ( foo => 1 );
                 $b{foo} = 2;

             Neither of these will do what a naive user would
             expect.

     dollar-underscore
             This option warns whenever $_ is used either expli-
             citly anywhere or as the implicit argument of a
             print statement.

     private-names
             This option warns on each use of any variable, sub-
             routine or method name that lives in a non-current
             package but begins with an underscore ("_"). Warn-
             ings aren't issued for the special case of the sin-
             gle 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 vari-
             ables $`, $& or $' is used. Any occurrence of any of
             these variables in your program can slow your whole
             program down. See perlre 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 pro-
             gram 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.

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     This module doesn't work correctly on thread-enabled perls.

AUTHOR

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

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