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110 lines
3.0 KiB
Perl
110 lines
3.0 KiB
Perl
#!/usr/bin/env perl
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# The contents of this file are subject to the Netscape Public License
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# Version 1.0 (the "License"); you may not use this file except in
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# compliance with the License. You may obtain a copy of the License at
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# http://www.mozilla.org/NPL/
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#
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# Software distributed under the License is distributed on an "AS IS"
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# basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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# License for the specific language governing rights and limitations
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# under the 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 Netscape Communications
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# Corporation. Portions created by Netscape are Copyright (C) 1999
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# Netscape Communications Corporation. All Rights Reserved.
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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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$outfile = shift @ARGV;
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@alldeps=();
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# Parse dependency files
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while ($line = <>) {
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chomp $line;
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($obj,$rest) = split /:\s+/, $line, 2;
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next if $obj eq '';
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if ($line =~ /\\$/) {
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chop $rest;
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$hasSlash = 1;
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} else {
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$hasSlash = 0;
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}
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$deps = [ $obj, split /\s+/, $rest ];
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while ($hasSlash and $line = <>) {
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chomp $line;
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if ($line =~ /\\$/) {
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chop $line;
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} else {
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$hasSlash = 0;
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}
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$line =~ s/^\s+//;
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push @{$deps}, split /\s+/, $line;
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}
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push @alldeps, $deps;
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}
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# Test dependencies
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foreach $deps (@alldeps) {
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$obj = shift @{$deps};
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$mtime = (stat $obj)[9] or next;
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foreach $dep_file (@{$deps}) {
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if (not defined($dep_mtime = $modtimes{$dep_file})) {
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$dep_mtime = (stat $dep_file)[9];
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$modtimes{$dep_file} = $dep_mtime;
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}
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if ($dep_mtime ne '' and $dep_mtime > $mtime) {
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print "$obj($mtime) older than $dep_file($dep_mtime)\n" if $debug;
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push @objs, $obj;
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# Object will be marked for rebuild. No need to check other dependencies.
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last;
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}
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}
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}
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# Output objects to rebuild (if needed).
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if (@objs) {
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$new_output = "@objs: FORCE\n";
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# Read in the current dependencies file.
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open(OLD, "<$outfile")
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and $old_output = <OLD>;
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close(OLD);
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# Only write out the dependencies if they are different.
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if ($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, $outfile\n";
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if ($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, $outfile\n";
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if ($debug) {
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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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unlink $outfile;
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}
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