Switch build date to use the last commit time

This reduces binary changes if the same commit version is re-built

configure.ac

@@ -4,6 +4,8 @@ dnl> Do not add anything above
 
 N2N_VERSION=${PACKAGE_VERSION}
 
+AC_DEFINE([PACKAGE_BUILDDATE], "[m4_esyscmd([scripts/version.sh date | tr -d '\n'])]", [Last change date])
+
 if test "${CC+set}" != set; then
     CC=gcc
 fi

include/n2n.h

@@ -51,8 +51,6 @@
 
 
 
-#define PACKAGE_BUILDDATE (__DATE__ " " __TIME__)
-
 #include <time.h>
 #include <ctype.h>
 #include <stdlib.h>

scripts/hack_fakeautoconf.sh

@@ -18,4 +18,5 @@ EOF
 cat <<EOF >include/config.h
 #define PACKAGE_VERSION "FIXME"
 #define PACKAGE_OSNAME "FIXME"
+#define PACKAGE_BUILDDATE "$(date)"
 EOF

scripts/version.sh

@@ -4,7 +4,7 @@
 #
 
 usage() {
-    echo "Usage: $0 [short|hash]"
+    echo "Usage: $0 [date|short|hash]"
     echo
     echo "Determine the correct version number for the current build"
     exit 0
@@ -32,6 +32,7 @@ if [ -d "$TOPDIR/.git" ]; then
     VER_SHORT="$VER_GIT_SHORT"
     VER_HASH=$(git rev-parse --short HEAD)
     VER=$(git describe --abbrev=7 --dirty)
+    DATE=$(git log -1 --format=%cd)
 else
     # If there is no .git directory in our TOPDIR, we fall back on relying on
     # the VERSION file
@@ -39,9 +40,13 @@ else
     VER_SHORT="$VER_FILE_SHORT"
     VER_HASH="HEAD"
     VER="$VER_FILE_SHORT"
+    DATE=$(date)
 fi
 
 case "$1" in
+    date)
+        echo "$DATE"
+        ;;
     hash)
         echo "$VER_HASH"
         ;;