gecko-dev/config/mddepend.pl

110 lines
3.0 KiB
Perl

#!/usr/bin/env perl
# The contents of this file are subject to the Netscape Public License
# Version 1.0 (the "License"); you may not use this file except in
# compliance with the License. You may obtain a copy of the License at
# http://www.mozilla.org/NPL/
#
# Software distributed under the License is distributed on an "AS IS"
# basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
# License for the specific language governing rights and limitations
# under the License.
#
# The Original Code is this file as it was released upon March 8, 1999.
#
# The Initial Developer of the Original Code is Netscape Communications
# Corporation. Portions created by Netscape are Copyright (C) 1999
# Netscape Communications Corporation. All Rights Reserved.
# mddepend.pl - Reads in dependencies generated my -MD flag. Prints list
# of objects that need to be rebuilt. These can then be added to the
# PHONY target. Using this script copes with the problem of header
# files that have been removed from the build.
#
# Usage:
# mddepend.pl <output_file> <dependency_files...>
#
# Send comments, improvements, bugs to Steve Lamm (slamm@netscape.com).
$outfile = shift @ARGV;
@alldeps=();
# Parse dependency files
while ($line = <>) {
chomp $line;
($obj,$rest) = split /:\s+/, $line, 2;
next if $obj eq '';
if ($line =~ /\\$/) {
chop $rest;
$hasSlash = 1;
} else {
$hasSlash = 0;
}
$deps = [ $obj, split /\s+/, $rest ];
while ($hasSlash and $line = <>) {
chomp $line;
if ($line =~ /\\$/) {
chop $line;
} else {
$hasSlash = 0;
}
$line =~ s/^\s+//;
push @{$deps}, split /\s+/, $line;
}
push @alldeps, $deps;
}
# Test dependencies
foreach $deps (@alldeps) {
$obj = shift @{$deps};
$mtime = (stat $obj)[9] or next;
foreach $dep_file (@{$deps}) {
if (not defined($dep_mtime = $modtimes{$dep_file})) {
$dep_mtime = (stat $dep_file)[9];
$modtimes{$dep_file} = $dep_mtime;
}
if ($dep_mtime ne '' and $dep_mtime > $mtime) {
print "$obj($mtime) older than $dep_file($dep_mtime)\n" if $debug;
push @objs, $obj;
# Object will be marked for rebuild. No need to check other dependencies.
last;
}
}
}
# Output objects to rebuild (if needed).
if (@objs) {
$new_output = "@objs: FORCE\n";
# Read in the current dependencies file.
open(OLD, "<$outfile")
and $old_output = <OLD>;
close(OLD);
# Only write out the dependencies if they are different.
if ($new_output ne $old_output) {
open(OUT, ">$outfile") and print OUT "$new_output";
print "Updating dependencies file, $outfile\n";
if ($debug) {
print "new: $new_output\n";
print "was: $old_output\n" if $old_output ne '';
}
}
} elsif (-s $outfile) {
# Remove the old dependencies because all objects are up to date.
print "Removing old dependencies file, $outfile\n";
if ($debug) {
open(OLD, "<$outfile")
and $old_output = <OLD>;
close(OLD);
print "was: $old_output\n";
}
unlink $outfile;
}