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 <leonerd@leonerd.org.uk> Based on the "B::Lint" module by Malcolm Beattie, <mbeattie@sable.ox.ac.uk>.