B::LintSubs 0.04

B::LintSubs is a Perl compiler backend to check sub linkage.

SYNOPSIS

perl -MO=LintSubs [FILE] [-e PROGRAM]

When using use strict, subroutine names are not checked at the callsite; this makes the following a perfectly valid program at compiletime, that only blows up at runtime

use strict;
foobar();

When using the B::LintSubs checker instead, this is detected:

$ perl -MO=LintSubs -e 'use strict;
foobar();'
Undefined subroutine foobar called at -e line 2

Imported functions from other modules are of course detected:

$ perl -MO=LintSubs -e 'use strict;
use List::Util qw( max );
$_ = max( 1, 2, 3 )'
-e syntax OK

In order to handle situations where external code is conditionally referenced at runtime, any fully-qualified references to other functions are printed with a warning, but not considered fatal. The programmer is assumed to Know What He Is Doing in this case:

$ perl -MO=LintSubs -e 'if( 1 ) { require Data::Dumper;
Data::Dumper::Dump( "Hello" ) }'

Unable to check call to Data::Dumper::Dump in foreign package at -e line 1

-e syntax OK

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Requirements:

· Perl