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    NAME

         B::C - Perl compiler's C backend
    
    
    

    SYNOPSIS

                 perl -MO=C[,OPTIONS] foo.pl
    
    
    
    

    DESCRIPTION

         This compiler backend takes Perl source and generates C
         source code corresponding to the internal structures that
         perl uses to run your program. When the generated C source
         is compiled and run, it cuts out the time which perl would
         have taken to load and parse your program into its internal
         semi-compiled form. That means that compiling with this
         backend will not help improve the runtime execution speed of
         your program but may improve the start-up time.  Depending
         on the environment in which your program runs this may be
         either a help or a hindrance.
    
    
    

    OPTIONS

         If there are any non-option arguments, they are taken to be
         names of objects to be saved (probably doesn't work properly
         yet).  Without extra arguments, it saves the main program.
    
         -ofilename
             Output to filename instead of STDOUT
    
         -v  Verbose compilation (currently gives a few compilation
             statistics).
    
         --  Force end of options
    
         -uPackname
             Force apparently unused subs from package Packname to be
             compiled.  This allows programs to use eval "foo()" even
             when sub foo is never seen to be used at compile time.
             The down side is that any subs which really are never
             used also have code generated. This option is necessary,
             for example, if you have a signal handler foo which you
             initialise with $SIG{BAR} = "foo".  A better fix,
             though, is just to change it to $SIG{BAR} = \&foo. You
             can have multiple -u options. The compiler tries to
             figure out which packages may possibly have subs in
             which need compiling but the current version doesn't do
             it very well. In particular, it is confused by nested
             packages (i.e.  of the form A::B) where package A does
             not contain any subs.
    
         -D  Debug options (concatenated or separate flags like perl
             -D).
    
    
         -Do OPs, prints each OP as it's processed
    
         -Dc COPs, prints COPs as processed (incl. file & line num)
    
         -DA prints AV information on saving
    
         -DC prints CV information on saving
    
         -DM prints MAGIC information on saving
    
         -f  Force optimisations on or off one at a time.
    
         -fcog
             Copy-on-grow: PVs declared and initialised statically.
    
         -fno-cog
             No copy-on-grow.
    
         -On Optimisation level (n = 0, 1, 2, ...). -O means -O1.
             Currently, -O1 and higher set -fcog.
    
    
    

    EXAMPLES

             perl -MO=C,-ofoo.c foo.pl
             perl cc_harness -o foo foo.c
    
         Note that cc_harness lives in the B subdirectory of your
         perl library directory. The utility called perlcc may also
         be used to help make use of this compiler.
    
             perl -MO=C,-v,-DcA bar.pl > /dev/null
    
    
    
    

    BUGS

         Plenty. Current status: experimental.
    
    
    

    AUTHOR

         Malcolm Beattie, [email protected]
    
    
    
    


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