mkdep.pl

   1 #!/usr/bin/perl
   2 #
   3 # Script to create Makefile-style dependencies.
   4 #
   5 # Usage: perl mkdep.pl [-s path-separator] [-o obj-ext] 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     if ( $sep eq '' ) {
  71         # This means kill path completely.  Used with Makes who do
  72         # path searches, but doesn't handle output files in subdirectories,
  73         # like OpenWatcom WMAKE.
  74         return $fspec[scalar(@fspec)-1];
  75     } else {
  76         return join($sep, @fspec);
  77     }
  78 }
  79
  80 #
  81 # Insert dependencies into a Makefile
  82 #
  83 sub insert_deps($) {
  84     my($file) = @_;
  85     $nexttemp++;                # Unique serial number for each temp file
  86     my($tmp) = File::Spec->catfile(dirname($file), 'tmp.'.$nexttemp);
  87
  88     sysopen(IN, $file, O_RDONLY)
  89         or die "$0: Cannot open input: $file\n";
  90     sysopen(OUT, $tmp, O_WRONLY|O_CREAT|O_TRUNC, 0666)
  91         or die "$0: Cannot open output: $tmp\n";
  92
  93     my($line,$parm,$val);
  94     my($obj) = '.o';            # Defaults
  95     my($sep) = '/';
  96     my($maxline) = 78;          # Seems like a reasonable default
  97
  98     while ( defined($line = <IN>) ) {
  99         if ( $line =~ /^\s*\#\s*@([a-z0-9-]+):\s*\"([^\"]*)\"/ ) {
 100             $parm = $1;  $val = $2;
 101             if ( $parm eq 'object-ending' ) {
 102                 $obj = $val;
 103             } elsif ( $parm eq 'path-separator' ) {
 104                 $sep = $val;
 105             } elsif ( $parm eq 'line-width' ) {
 106                 $maxline = $val+0;
 107             }
 108         } elsif ( $line eq $barrier ) {
 109             last;               # Stop reading input at barrier line
 110         }
 111         print OUT $line;
 112     }
 113     close(IN);
 114
 115     my $dfile, $ofile, $str, $sl, $len;
 116     my @deps, $dep;
 117
 118     print OUT $barrier;
 119
 120     foreach $dfile ( sort(keys(%deps)) ) {
 121         if ( $dfile =~ /\.[Cc]$/ ) {
 122             $ofile = $dfile; $ofile =~ s/\.[Cc]$//;
 123             $str = convert_file($ofile,$sep).$obj.':';
 124             $len = length($str);
 125             print OUT $str;
 126             foreach $dep ($dfile, alldeps($dfile)) {
 127                 $str = convert_file($dep,$sep);
 128                 $sl = length($str)+1;
 129                 if ( $len+$sl > $maxline-2 ) {
 130                     print OUT " \\\n ", $str;
 131                     $len = $sl;
 132                 } else {
 133                     print OUT ' ', $str;
 134                     $len += $sl;
 135                 }
 136             }
 137             print OUT "\n";
 138         }
 139     }
 140     close(OUT);
 141
 142     (unlink($file) && rename($tmp, $file))
 143         or die "$0: Failed to change $tmp -> $file\n";
 144 }
 145
 146 #
 147 # Main program
 148 #
 149
 150 %deps = ();
 151 @files = ();
 152 @mkfiles = ();
 153 $mkmode = 0;
 154
 155 while ( defined($arg = shift(@ARGV)) ) {
 156     if ( $arg eq '-m' ) {
 157         $arg = shift(@ARGV);
 158         push(@mkfiles, $arg);
 159     } elsif ( $arg eq '-M' ) {
 160         $mkmode = 1;            # Futher filenames are output Makefile names
 161     } elsif ( $arg eq '--' && $mkmode ) {
 162         $mkmode = 0;
 163     } elsif ( $arg =~ /^-/ ) {
 164         die "Unknown option: $arg\n";
 165     } else {
 166         if ( $mkmode ) {
 167             push(@mkfiles, $arg);
 168         } else {
 169             push(@files, $arg);
 170         }
 171     }
 172 }
 173
 174 foreach $dir ( @files ) {
 175     opendir(DIR, $dir) or die "$0: Cannot open directory: $dir";
 176
 177     while ( $file = readdir(DIR) ) {
 178         $path = ($dir eq File::Spec->curdir())
 179             ? $file : File::Spec->catfile($dir,$file);
 180         if ( $file =~ /\.[Cc]$/ ) {
 181             scandeps($path);
 182         }
 183     }
 184     closedir(DIR);
 185 }
 186
 187 foreach $mkfile ( @mkfiles ) {
 188     insert_deps($mkfile);
 189 }