make sure that forwards for injected headers are not garbage-collected

qmake-generated version headers don't exist yet at the time syncqt runs,
so the forwarding headers would be deleted - just to be re-created a
moment later, thus changing the timestamp for no good reason.

Change-Id: I1b4c2f05f57c2315adf4b8dd726ea413ede1be5b
Reviewed-by: Joerg Bornemann <joerg.bornemann@nokia.com>

diff --git a/bin/syncqt b/bin/syncqt
index 04d3162..6bcaccc 100755 (executable)
--- a/bin/syncqt
+++ b/bin/syncqt
@@ -597,6 +597,12 @@ sub basePrettify {
     $$arg =~ s,^\Q$out_basedir\E,<outbase>,;
 }
 
+sub cleanPath {
+    my ($arg) = @_;
+    while ($arg =~ s,[^/]+/\.\.(/|$),,) {}
+    return $arg;
+}
+
 sub locateSyncProfile
 {
     my ($directory) = @_;
@@ -876,6 +882,15 @@ foreach my $lib (@modules_to_sync) {
 
     #remove the old files
     if($remove_stale) {
+        my %injections = ();
+        for my $p (keys %inject_headers) {
+            next unless ($p =~ /^\Q$dir\E(\/|$)/);
+            my $sp = $p;
+            $sp =~ s,^\Q$basedir\E/,$out_basedir/,;
+            for my $n (@{$inject_headers{$p}}) {
+                $injections{$sp."/".$n} = 1;
+            }
+        }
         my @subdirs = ("$out_basedir/include/$lib");
         foreach my $subdir (@subdirs) {
             if (opendir DIR, $subdir) {
@@ -894,7 +909,7 @@ foreach my $lib (@modules_to_sync) {
                                     if($line =~ /^\#include \"([^\"]*)\"$/) {
                                         my $include = $1;
                                         $include = $subdir . "/" . $include unless(substr($include, 0, 1) eq "/");
-                                        $remove_file = 1 unless(-e $include);
+                                        $remove_file = 1 unless(-e $include or defined $injections{cleanPath($include)});
                                     } else {
                                         $remove_file = 0;
                                         last;