Makefile.media were rewritten even when not required.

From: Mauro Carvalho Chehab <mchehab@infradead.org>

make 3.81 were suffering some endless loop that might be caused
by Makefile.media rewrites. After this patch, make_makefile will
only write Makefile.media if needed.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 24 insertions, 2 deletions

diff --git a/v4l/scripts/make_makefile.pl b/v4l/scripts/make_makefile.pl
index 238c5082f..bcfb3764f 100755
--- a/v4l/scripts/make_makefile.pl
+++ b/v4l/scripts/make_makefile.pl
@@ -109,7 +109,7 @@ sub open_makefile($) {
 	close $in;
 }
 
-open OUT,">Makefile.media";
+open OUT,">Makefile.media.new";
 open_makefile ("../linux/drivers/media/Makefile");
 
 # Creating Install rule
@@ -156,7 +156,29 @@ while ( my ($key, $value) = each(%depend) ) {
 }
 close OUT;
 
-if (open OUT,".myconfig") {
+if (open IN,"Makefile.media") {
+	close IN;
+	my $changed=0;
+	if (open IN,"diff Makefile.media Makefile.media.new|") {
+		while (<IN>) {
+			if ($_ ne "") {
+				$changed=1;
+			}
+		}
+		close IN;
+		if ($changed) {
+			printf("One or more linux Makefiles had changed. Makefile.media rewrited.\n");
+			system ("mv Makefile.media.new Makefile.media");
+		} else {
+			system ("rm Makefile.media.new");
+		}
+	}
+} else {
+	printf("Creating Makefile.media.\n");
+	system "mv Makefile.media.new Makefile.media";
+}
+
+if (open IN,".myconfig") {
 	close IN;
 } else {
 	system "make allmodconfig";