ACE Tutorial 005
On the road to a multithreaded server

And last (and probably least) is the perl script that pulls the dependency stuff out of Makefile and into .depend.

    eval '(exit $?0)' && eval 'exec perl -w -S $0 ${1+"$@"}'
        & eval 'exec perl -S $0 $argv:q'
        if 0;

    require "getopts.pl";
    &Getopts("f:o:");

    $opt_f = "Makefile" if( ! $opt_f );
    $opt_o = ".depend"  if( ! $opt_o );

    	# Open the Makefile that has been mangled by 'make depend'
    	# and suck it into a perl array.
    open(IF,"<$opt_f") || die;
    @makefile = <IF>;
    close(IF);

    	# Now open our .depend file and a temporary Makefile.
    	# We'll split the original Makefile between these two.
    open(DF,">$opt_o") || die;
    open(MF,">$opt_f.tmp") || die;

    	# For each line we read out of the original file...
    foreach (@makefile) {

    	# If we're into the dependency section, write the line
    	# into the .depend file.
    	#
    	if( $depend ) {
    		print DF $_;
    	}
    	else {
    		# If we haven't gotten to the dependency section yet
    		# then see if the current line is the separator that
    		# "make depend" causes to be inserted.
    		#
    		if( m/^\Q# DO NOT DELETE THIS LINE -- g++dep uses it.\E/ ) {

    			# If so, change our "mode" and skip this line.
    			++$depend;
    			next;
    		}

    		# Also skip the "include .depend" that we insert.  If we
    		# don't do this, it is possible to have a bunch of these
    		# inserted into the output when we read an unmangled Makefile
    		next if( m/^include $opt_o/ );

    		# Print the non-dependency info to the temporary Makefile
    		print MF $_;
    	}
    }

    # Tell our new Makefile to include the dependency file
    print MF "include $opt_o\n";

    # Close the two output files...
    close(DF);
    close(MF);

    # Unlink (remove) the original Makefile and rename our
    # temporary file.  There's obviously room for error checking
    # here but we've got the Makefile checked into some revision
    # control system anyway.  Don't we?

    unlink("$opt_f");
    rename("$opt_f.tmp","$opt_f");

    exit(0);

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