mkdep.pl

   1 #!/usr/bin/perl
   2 #
   3 # Script to create Makefile-style dependencies.
   4 #
   5 # Usage: perl [-s path-separator] [-o obj-ext] mkdep.pl dir... > deps
   6 #
   7
   8 use File::Spec;
   9 use File::Basename;
  10 use Fcntl;
  11
  12 $barrier = "#-- Everything below is generated by mkdep.pl - do not edit --#\n";
  13
  14 #
  15 # Scan files for dependencies
  16 #
  17 sub scandeps($) {
  18     my($file) = @_;
  19     my($line, $nf);
  20     my(@xdeps) = ();
  21     my(@mdeps) = ();
  22
  23     sysopen(FILE, $file, O_RDONLY)
  24         or return;              # If not openable, assume generated
  25
  26     while ( defined($line = <FILE>) ) {
  27         chomp $line;
  28         $line =~ s:/\*.*\*/::g;
  29         $line =~ s://.*$::;
  30         if ( $line =~ /^\s*\#\s*include\s+\"(.*)\"\s*$/ ) {
  31             $nf = $1;
  32             push(@mdeps, $nf);
  33             push(@xdeps, $nf) unless ( defined($deps{$nf}) );
  34         }
  35     }
  36     close(FILE);
  37     $deps{$file} = [@mdeps];
  38
  39     foreach $file ( @xdeps ) {
  40         scandeps($file);
  41     }
  42 }
  43
  44 # %deps contains direct dependencies.  This subroutine resolves
  45 # indirect dependencies that result.
  46 sub alldeps($) {
  47     my($file) = @_;
  48     my(%adeps);
  49     my($dep,$idep);
  50
  51     foreach $dep ( @{$deps{$file}} ) {
  52         $adeps{$dep} = 1;
  53         foreach $idep ( alldeps($dep) ) {
  54             $adeps{$idep} = 1;
  55         }
  56     }
  57     return keys(%adeps);
  58 }
  59
  60 # This converts a filename from host syntax to target syntax
  61 # This almost certainly works only on relative filenames...
  62 sub convert_file($$) {
  63     my($file,$sep) = @_;
  64     my(@fspec) = (basename($file));
  65     while ( ($file = dirname($file)) ne File::Spec->curdir() &&
  66             $file ne File::Spec->rootdir() ) {
  67         unshift(@fspec, basename($file));
  68     }
  69
  70     return join($sep, @fspec);
  71 }
  72
  73 #
  74 # Insert dependencies into a Makefile
  75 #
  76 sub insert_deps($) {
  77     my($file) = @_;
  78     $nexttemp++;                # Unique serial number for each temp file
  79     my($tmp) = File::Spec->catfile(dirname($file), 'tmp.'.$nexttemp);
  80
  81     sysopen(IN, $file, O_RDONLY)
  82         or die "$0: Cannot open input: $file\n";
  83     sysopen(OUT, $tmp, O_WRONLY|O_CREAT|O_TRUNC, 0666)
  84         or die "$0: Cannot open output: $tmp\n";
  85
  86     my($line,$parm,$val);
  87     my($obj) = '.o';            # Defaults
  88     my($sep) = '/';
  89     my($maxline) = 78;          # Seems like a reasonable default
  90
  91     while ( defined($line = <IN>) ) {
  92         if ( $line =~ /^\s*\#\s*@([a-z0-9-]+):\s*\"([^\"]*)\"/ ) {
  93             $parm = $1;  $val = $2;
  94             if ( $parm eq 'object-ending' ) {
  95                 $obj = $val;
  96             } elsif ( $parm eq 'path-separator' ) {
  97                 $sep = $val;
  98             } elsif ( $parm eq 'line-width' ) {
  99                 $maxline = $val+0;
 100             }
 101         } elsif ( $line eq $barrier ) {
 102             last;               # Stop reading input at barrier line
 103         }
 104         print OUT $line;
 105     }
 106     close(IN);
 107
 108     my $dfile, $ofile, $str, $sl, $len;
 109     my @deps, $dep;
 110
 111     print OUT $barrier;
 112
 113     foreach $dfile ( sort(keys(%deps)) ) {
 114         if ( $dfile =~ /\.[Cc]$/ ) {
 115             $ofile = $dfile; $ofile =~ s/\.[Cc]$//;
 116             $str = convert_file($ofile,$sep).$obj.':';
 117             $len = length($str);
 118             print OUT $str;
 119             foreach $dep ($dfile, alldeps($dfile)) {
 120                 $str = convert_file($dep,$sep);
 121                 $sl = length($str)+1;
 122                 if ( $len+$sl > $maxline-2 ) {
 123                     print OUT " \\\n ", $str;
 124                     $len = $sl;
 125                 } else {
 126                     print OUT ' ', $str;
 127                     $len += $sl;
 128                 }
 129             }
 130             print OUT "\n";
 131         }
 132     }
 133     close(OUT);
 134
 135     (unlink($file) && rename($tmp, $file))
 136         or die "$0: Failed to change $tmp -> $file\n";
 137 }
 138
 139 #
 140 # Main program
 141 #
 142
 143 %deps = ();
 144 @files = ();
 145 @mkfiles = ();
 146 $mkmode = 0;
 147
 148 while ( defined($arg = shift(@ARGV)) ) {
 149     if ( $arg eq '-m' ) {
 150         $arg = shift(@ARGV);
 151         push(@mkfiles, $arg);
 152     } elsif ( $arg eq '-M' ) {
 153         $mkmode = 1;            # Futher filenames are output Makefile names
 154     } elsif ( $arg eq '--' && $mkmode ) {
 155         $mkmode = 0;
 156     } elsif ( $arg =~ /^-/ ) {
 157         die "Unknown option: $arg\n";
 158     } else {
 159         if ( $mkmode ) {
 160             push(@mkfiles, $arg);
 161         } else {
 162             push(@files, $arg);
 163         }
 164     }
 165 }
 166
 167 foreach $dir ( @files ) {
 168     opendir(DIR, $dir) or die "$0: Cannot open directory: $dir";
 169
 170     while ( $file = readdir(DIR) ) {
 171         $path = ($dir eq File::Spec->curdir())
 172             ? $file : File::Spec->catfile($dir,$file);
 173         if ( $file =~ /\.[Cc]$/ ) {
 174             scandeps($path);
 175         }
 176     }
 177     closedir(DIR);
 178 }
 179
 180 foreach $mkfile ( @mkfiles ) {
 181     insert_deps($mkfile);
 182 }