NAME
   B::LintSubs - Perl compiler backend to check sub linkage

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

DESCRIPTION
   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

AUTHOR
   Paul Evans <[email protected]>

   Based on the "B::Lint" module by Malcolm Beattie,
   <[email protected]>.

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