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    Command:

    O

    
    
    

    SYNOPSIS

                   perl -MO=[-q,]Backend[,OPTIONS] foo.pl
    
    
    

    DESCRIPTION

           This is the module that is used as a frontend to the Perl Compiler.
    
           If you pass the "-q" option to the module, then the STDOUT filehandle
           will be redirected into the variable $O::BEGIN_output during
           compilation.  This has the effect that any output printed to STDOUT by
           BEGIN blocks or use'd modules will be stored in this variable rather
           than printed. It's useful with those backends which produce output
           themselves ("Deparse", "Concise" etc), so that their output is not
           confused with that generated by the code being compiled.
    
           The "-qq" option behaves like "-q", except that it also closes STDERR
           after deparsing has finished. This suppresses the "Syntax OK" message
           normally produced by perl.
    
    
    

    CONVENTIONS

           Most compiler backends use the following conventions: OPTIONS consists
           of a comma-separated list of words (no white-space).  The "-v" option
           usually puts the backend into verbose mode.  The "-ofile" option
           generates output to file instead of stdout. The "-D" option followed by
           various letters turns on various internal debugging flags. See the
           documentation for the desired backend (named "B::Backend" for the
           example above) to find out about that backend.
    
    
    

    IMPLEMENTATION

           This section is only necessary for those who want to write a compiler
           backend module that can be used via this module.
    
           The command-line mentioned in the SYNOPSIS section corresponds to the
           Perl code
    
               use O ("Backend", OPTIONS);
    
           The "O::import" function loads the appropriate "B::Backend" module and
           calls its "compile" function, passing it OPTIONS. That function is
           expected to return a sub reference which we'll call CALLBACK. Next, the
           "compile-only" flag is switched on (equivalent to the command-line
           option "-c") and a CHECK block is registered which calls CALLBACK. Thus
           the main Perl program mentioned on the command-line is read in, parsed
           and compiled into internal syntax tree form. Since the "-c" flag is
           set, the program does not start running (excepting BEGIN blocks of
           course) but the CALLBACK function registered by the compiler backend is
           called.
    
           In summary, a compiler backend module should be called "B::Foo" for
           some foo and live in the appropriate directory for that name.  It
           should define a function called "compile". When the user types
    
               perl -MO=Foo,OPTIONS foo.pl
    
    
    

    perl v5.10.1 2009-02-12 O(3pm)

    
    
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