netsurf/scandeps

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#!/usr/bin/perl -W
%include = ();
die "Usage: scandeps prefix object_dirs -- sources" if (@ARGV < 4);
$prefix = shift @ARGV;
$prefix = $prefix; # silence warning
@objdirs = ();
while (($z = shift @ARGV) ne "--") {
push @objdirs, $z;
}
# scan all files for relevant #include lines
foreach my $file (@ARGV) {
open FILE, "<$file" or die "Failed to open $file: $!";
while (my $line = <FILE>) {
if ($line =~ m|#include "$prefix/?([^"]+)"|) {
$include{$file}{$1} = 1;
}
}
close FILE;
}
# output dependencies
foreach my $file (@ARGV) {
next unless $file =~ m|([^/]+)[.]c$|;
%deps = ();
search_deps($file);
foreach my $z (@objdirs) {
print "$z/$1.o ";
}
print ": $file ";
foreach my $z (sort keys %deps) { print "$z " }
print "\n";
}
sub search_deps {
my $file = shift;
return unless exists $include{$file};
foreach my $z (keys %{$include{$file}}) {
next if exists $deps{$z};
$deps{$z} = 1;
search_deps($z);
}
}