Automatically update date in man pages to configure.ac last modification date

configure.ac

@@ -9,6 +9,10 @@ AC_CONFIG_HEADERS([src/config.h])
 AC_CONFIG_MACRO_DIR([m4])
 AC_USE_SYSTEM_EXTENSIONS([_GNU_SOURCE])
 
+# Automatically update release date based on configure.ac date
+release_date=`doc/mdate-sh configure.ac`
+AC_SUBST([RELEASE_DATE], $release_date)
+
 # Check SSE, SSE2 and SSE3 support
 AX_EXT
 CFLAGS="$CFLAGS $SIMD_FLAGS"

man/kdig.1.in

-.TH "kdig" "1" "April 2013" "CZ.NIC Labs" "Knot DNS, version @VERSION@"
+.TH "kdig" "1" "@RELEASE_DATE@" "CZ.NIC Labs" "Knot DNS, version @VERSION@"
 .SH NAME
 .TP 5
 .B kdig

man/khost.1.in

-.TH "khost" "1" "April 2013" "CZ.NIC Labs" "Knot DNS, version @VERSION@"
+.TH "khost" "1" "@RELEASE_DATE@" "CZ.NIC Labs" "Knot DNS, version @VERSION@"
 .SH NAME
 .TP 6
 .B khost

man/knot.conf.5.in

-.TH "knot.conf" "5" "September 2012" "CZ.NIC Labs" "Knot DNS, version @VERSION@"
+.TH "knot.conf" "5" "@RELEASE_DATE@" "CZ.NIC Labs" "Knot DNS, version @VERSION@"
 .SH "NAME"
 .LP
 .B knot.conf

man/knotc.8.in

-.TH knotc "8" "September 2012" "CZ.NIC Labs" "Knot DNS, version @VERSION@"
+.TH knotc "8" "@RELEASE_DATE@" "CZ.NIC Labs" "Knot DNS, version @VERSION@"
 .SH NAME
 .B knotc
 \- Knot DNS control utility

man/knotd.8.in

-.TH "knotd" "8" "September 2012" "CZ.NIC Labs" "Knot DNS, version @VERSION@"
+.TH "knotd" "8" "@RELEASE_DATE@" "CZ.NIC Labs" "Knot DNS, version @VERSION@"
 .SH NAME
 .B knotd
 \- Knot DNS daemon

man/knsupdate.1.in

-.TH "knsupdate" "1" "April 2013" "CZ.NIC Labs" "Knot DNS, version @VERSION@"
+.TH "knsupdate" "1" "@RELEASE_DATE@" "CZ.NIC Labs" "Knot DNS, version @VERSION@"
 .SH NAME
 .TP 10
 .B knsupdate