From c5806910918eb9adc3b3a821242cc4bc7647a50f Mon Sep 17 00:00:00 2001
From: Timothy Gu <timothygu99@gmail.com>
Date: Fri, 29 Nov 2013 09:57:30 -0800
Subject: [PATCH] version.sh: add preprocessing guards

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 version.sh | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/version.sh b/version.sh
index c28ffe7557..92edcb9474 100755
--- a/version.sh
+++ b/version.sh
@@ -42,9 +42,17 @@ if [ -z "$2" ]; then
 fi
 
 NEW_REVISION="#define FFMPEG_VERSION \"$version\""
-OLD_REVISION=$(cat "$2" 2> /dev/null)
+OLD_REVISION=$(cat "$2" 2> /dev/null | head -3 | tail -1)
+
+# String used for preprocessor guard
+GUARD=$(echo "$2" | sed 's/\//_/' | sed 's/\./_/' | tr '[:lower:]' '[:upper:]' | sed 's/LIB//')
 
 # Update version header only on revision changes to avoid spurious rebuilds
 if test "$NEW_REVISION" != "$OLD_REVISION"; then
-    echo "$NEW_REVISION" > "$2"
+    cat << EOF > "$2"
+#ifndef $GUARD
+#define $GUARD
+$NEW_REVISION
+#endif /* $GUARD */
+EOF
 fi