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    #
    
    # Update the list of debug channels of a given spec file
    
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    #
    
    # Copyright 2000 Alexandre Julliard
    #
    # Usage: make_debug spec_file [source_files...]
    
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    #
    
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    die "Usage: make_debug spec_file [source]\n" unless @ARGV;
    
    # read in all the source files
    if (@ARGV)
    {
        while (<>)
        {
            if (/DECLARE_DEBUG_CHANNEL\s*\(\s*([A-Za-z0-9_]+)\s*\)/) { $channels{$1} = 1; }
            if (/DEFAULT_DEBUG_CHANNEL\s*\(\s*([A-Za-z0-9_]+)\s*\)/) { $channels{$1} = 1; }
        }
    }
    @dbg_channels = sort keys %channels;
    
    # read the whole spec file
    undef $/;
    open SPEC or die "Cannot open $SPEC\n";
    $spec = <SPEC>;
    close SPEC;
    
    # build the new channel list
    $channel_str = "debug_channels (";
    $pos = length($channel_str);
    for ($i = 0; $i <= $#dbg_channels; $i++)
    {
       $channel_str .= $dbg_channels[$i];
       $pos += length($dbg_channels[$i]);
       if ($i < $#dbg_channels)
       {
           if ($pos >= 75) { $pos = 16; $channel_str .= "\n" . (" " x $pos); }
           else { $channel_str .= " "; $pos++; }
       }
    }
    $channel_str .= ")";
    
    # replace the list in the spec file
    if (!($spec =~ s/debug_channels\s*\(([^)]*)\)/$channel_str/))
    
        die "Could not replace debug_channels\n" if @dbg_channels;
        exit 0;
    
    
    # output the modified spec file
    open OUTPUT, ">$SPEC" or die "Cannot modify $SPEC\n";
    print OUTPUT $spec;
    close OUTPUT;