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#!/usr/bin/env perl |
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# ***** BEGIN LICENSE BLOCK ***** |
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# Version: MPL 1.1/GPL 2.0/LGPL 2.1 |
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# |
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# The contents of this file are subject to the Mozilla Public License Version |
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# 1.1 (the "License"); you may not use this file except in compliance with |
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# the License. You may obtain a copy of the License at |
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# http://www.mozilla.org/MPL/ |
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# |
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# Software distributed under the License is distributed on an "AS IS" basis, |
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# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License |
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# for the specific language governing rights and limitations under the |
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# License. |
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# |
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# The Original Code is this file as it was released upon March 8, 1999. |
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# |
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# The Initial Developer of the Original Code is |
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# Netscape Communications Corporation. |
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# Portions created by the Initial Developer are Copyright (C) 1999 |
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# the Initial Developer. All Rights Reserved. |
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# |
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# Contributor(s): |
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# |
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# Alternatively, the contents of this file may be used under the terms of |
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# either of the GNU General Public License Version 2 or later (the "GPL"), |
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# or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), |
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# in which case the provisions of the GPL or the LGPL are applicable instead |
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# of those above. If you wish to allow use of your version of this file only |
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# under the terms of either the GPL or the LGPL, and not to allow others to |
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# use your version of this file under the terms of the MPL, indicate your |
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# decision by deleting the provisions above and replace them with the notice |
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# and other provisions required by the GPL or the LGPL. If you do not delete |
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# the provisions above, a recipient may use your version of this file under |
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# the terms of any one of the MPL, the GPL or the LGPL. |
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# |
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# ***** END LICENSE BLOCK ***** |
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|
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# mddepend.pl - Reads in dependencies generated my -MD flag. Prints list |
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# of objects that need to be rebuilt. These can then be added to the |
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# PHONY target. Using this script copes with the problem of header |
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# files that have been removed from the build. |
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# |
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# Usage: |
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# mddepend.pl <output_file> <dependency_files...> |
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# |
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# Send comments, improvements, bugs to Steve Lamm (slamm@netscape.com). |
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|
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use strict; |
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|
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use constant DEBUG => 0; |
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|
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my $outfile = shift @ARGV; |
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my $silent = $ENV{MAKEFLAGS} =~ /^\w*s|\s-s/; |
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|
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my $line = ''; |
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my %alldeps; |
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# Parse dependency files |
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while (<>) { |
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s/\r?\n$//; # Handle both unix and DOS line endings |
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$line .= $_; |
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if ($line =~ /\\$/) { |
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chop $line; |
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next; |
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} |
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|
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my ($obj,$rest) = split /\s*:\s+/, $line, 2; |
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$line = ''; |
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next if !$obj || !$rest; |
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|
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my @deps = split /\s+/, $rest; |
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push @{$alldeps{$obj}}, @deps; |
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if (DEBUG >= 2) { |
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foreach my $dep (@deps) { print "add $obj $dep\n"; } |
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} |
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} |
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|
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# Test dependencies |
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my %modtimes; # cache |
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my @objs; # force rebuild on these |
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OBJ_LOOP: foreach my $obj (keys %alldeps) { |
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my $mtime = (stat $obj)[9] or next; |
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|
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my %not_in_cache; |
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my $deps = $alldeps{$obj}; |
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foreach my $dep_file (@{$deps}) { |
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my $dep_mtime = $modtimes{$dep_file}; |
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if (not defined $dep_mtime) { |
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print "Skipping $dep_file for $obj, will stat() later\n" if DEBUG >= 2; |
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$not_in_cache{$dep_file} = 1; |
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next; |
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} |
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|
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print "Found $dep_file in cache\n" if DEBUG >= 2; |
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|
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if ($dep_mtime > $mtime) { |
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print "$dep_file($dep_mtime) newer than $obj($mtime)\n" if DEBUG; |
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} |
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elsif ($dep_mtime == -1) { |
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print "Couldn't stat $dep_file for $obj\n" if DEBUG; |
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} |
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else { |
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print "$dep_file($dep_mtime) older than $obj($mtime)\n" if DEBUG >= 2; |
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next; |
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} |
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|
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push @objs, $obj; # dependency is missing or newer |
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next OBJ_LOOP; # skip checking the rest of the dependencies |
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} |
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|
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foreach my $dep_file (keys %not_in_cache) { |
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print "STAT $dep_file for $obj\n" if DEBUG >= 2; |
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my $dep_mtime = $modtimes{$dep_file} = (stat $dep_file)[9] || -1; |
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|
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if ($dep_mtime > $mtime) { |
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print "$dep_file($dep_mtime) newer than $obj($mtime)\n" if DEBUG; |
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} |
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elsif ($dep_mtime == -1) { |
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print "Couldn't stat $dep_file for $obj\n" if DEBUG; |
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} |
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else { |
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print "$dep_file($dep_mtime) older than $obj($mtime)\n" if DEBUG >= 2; |
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next; |
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} |
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|
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push @objs, $obj; # dependency is missing or newer |
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next OBJ_LOOP; # skip checking the rest of the dependencies |
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} |
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|
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# If we get here it means nothing needs to be done for $obj |
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} |
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|
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# Output objects to rebuild (if needed). |
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if (@objs) { |
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my $old_output; |
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my $new_output = "@objs: FORCE\n"; |
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|
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# Read in the current dependencies file. |
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open(OLD, "<$outfile") |
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and $old_output = <OLD>; |
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close(OLD); |
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|
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# Only write out the dependencies if they are different. |
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if ($new_output ne $old_output) { |
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open(OUT, ">$outfile") and print OUT "$new_output"; |
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print "Updating dependencies file, $outfile\n" unless $silent; |
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if (DEBUG) { |
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print "new: $new_output\n"; |
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print "was: $old_output\n" if $old_output ne ''; |
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} |
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} |
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} elsif (-s $outfile) { |
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# Remove the old dependencies because all objects are up to date. |
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print "Removing old dependencies file, $outfile\n" unless $silent; |
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|
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if (DEBUG) { |
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my $old_output; |
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open(OLD, "<$outfile") |
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and $old_output = <OLD>; |
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close(OLD); |
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print "was: $old_output\n"; |
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} |
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|
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unlink $outfile; |
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} |
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