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B::C(3)		       Perl Programmers Reference Guide		       B::C(3)

       B::C - Perl compiler's C backend

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

       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 environ‐
       ment in which your program runs this may be either a help or a hin‐

       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.

	   Output to filename instead of STDOUT

       -v  Verbose compilation (currently gives a few compilation statistics).

       --  Force end of options

	   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 possi‐
	   bly 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 con‐
	   tain 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 options/optimisations on or off one at a time. You can
	   explicitly disable an option using -fno-option. All options default
	   to disabled.

	       Copy-on-grow: PVs declared and initialised statically.

	       Save package::DATA filehandles ( only available with PerlIO ).

	       Optimize the initialization of op_ppaddr.

	       Optimize the initialization of cop_warnings.

	       Use the script name instead of the program name as $0.

	       Save compile-time modifications to the %SIG hash.

       -On Optimisation level (n = 0, 1, 2, ...). -O means -O1.

	   -O0 Disable all optimizations.

	   -O1 Enable -fcog.

	   -O2 Enable -fppaddr, -fwarn-sv.

	   Some C compilers impose an arbitrary limit on the length of string
	   constants (e.g. 2048 characters for Microsoft Visual C++).  The
	   -llimit options tells the C backend not to generate string literals
	   exceeding that limit.

	   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,-l2048 bar.pl > /dev/null

       Plenty. Current status: experimental.

       Malcolm Beattie, "mbeattie@sable.ox.ac.uk"

perl v5.8.8			  2001-09-21			       B::C(3)

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