I am calling a function (func1) from library2.pm in library1.pm. And the function is called simply as &func1(), since I declared " use library2 " in library1. But this is throwing an error as the undefined subroutine. But when I am calling that function as " &library2::func1 " it is working. Am I missing any Perl package here?
Did you export the function? It's hard to tell what you're missing since you didn't post any code! I could explain why you need what's missing if I knew what it was. Instead, you'll have to settle for an example of what's needed.
library2.pm should include:
package library2;
use strict;
use warnings;
use Exporter qw( import );
our @EXPORT = qw( func1 );
...
sub func1 { ... }
...
1;
library1.pm should include:
package library1;
use strict;
use warnings;
use library2;
...
func1(...)
...
1;
By the way, the name of the language is Perl, not PERL. It's not an acronym.
By the way, you should stop using & in front of sub calls; there's no reason to tell Perl to ignore the prototypes of the subs you call.
By the way, lower-case module names are technically reserved for use by Perl. But more importantly, convention reserves lower-case modules for pragma modules (modules that affect the language, and modules that are lexically-scoped in effect). Please avoid lower-case module names.
By the way,
use library2 qw( func1 );
is generally better than
use library2;
because it's easier to see where subs are defined, and it prevents surprises if the default exports of a module ever change.