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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, mbeattie@sable.ox.ac.uk









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