in reply to Re: Detecting undefined subroutines at compile time
in thread Detecting undefined subroutines at compile time

In absence of AUTOLOAD, you don't even need to eval the calls. You can just use defined &func to check whether a subroutine was defined. This will supposedly even see through forward declarations of 

sub foo;

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You still need to run the BEGIN blocks of all use statements at least.

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Re^3: Detecting undefined subroutines at compile time (B::Xref)
by LanX (Saint) on May 02, 2011 at 18:15 UTC
    just found that B::Xref lists sub-calls and(!) sub-definitions: 
     perl -MO=Xref tst.pl |grep foo
tst.pl syntax OK
      &foo              s1
      &foo              &1, &4
  Subroutine foo

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    so just needing to parse¹ and compare the output.

    But I agree that the dynamic nature of Perl makes such static parsing look strange.

    Cheers Rolf

    1) especially the raw output could be easily processed:

    $ perl -MO=Xref,-r tst.pl |grep foo
tst.pl           (definitions)     1 main            & foo            
+  subdef
tst.pl syntax OK
tst.pl           (main)           1 main            & foo             
+ subused
tst.pl           (main)           4 main            & foo             
+ subused
tst.pl           foo              3 main            $ _               
+ used
$ cat tst.pl 
foo();
 
sub foo { print }
foo();

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