X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/243be465d6c1b031baf15124d51437c58dcfa5aa..refs/heads/tcpdump-4.99:/autogen.sh

diff --git a/autogen.sh b/autogen.sh
index b3c321b0..2ff00d3e 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -1,6 +1,7 @@
 #!/bin/sh -e
 
 : "${AUTORECONF:=autoreconf}"
+: "${BUILD_YEAR2038:=no}"
 
 AUTORECONFVERSION=`$AUTORECONF --version 2>&1 | grep "^autoreconf" | sed 's/.*) *//'`
 
@@ -8,7 +9,7 @@ maj=`echo "$AUTORECONFVERSION" | cut -d. -f1`
 min=`echo "$AUTORECONFVERSION" | cut -d. -f2`
 # The minimum required version of autoconf is currently 2.69.
 if [ "$maj" = "" ] || [ "$min" = "" ] || \
-   [ "$maj" -lt 2 ] || [ "$maj" -eq 2 -a "$min" -lt 69 ]; then
+   [ "$maj" -lt 2 ] || { [ "$maj" -eq 2 ] && [ "$min" -lt 69 ]; }; then
 	cat >&2 <<-EOF
 	Please install the 'autoconf' package version 2.69 or later.
 	If version 2.69 or later is already installed and there is no
@@ -21,5 +22,27 @@ if [ "$maj" = "" ] || [ "$min" = "" ] || \
 	exit 1
 fi
 
+# On Linux, if Autoconf version >= 2.72 and GNU C Library version >= 2.34,
+# s/AC_SYS_LARGEFILE/AC_SYS_YEAR2038_RECOMMENDED/ to ensure time_t
+# is Y2038-safe.
+if [ "$BUILD_YEAR2038" = yes ] && [ "`uname -s`" = Linux ]; then
+	if [ "$maj" -gt 2 ] || { [ "$maj" -eq 2 ] && [ "$min" -ge 72 ]; }; then
+		GLIBC_VERSION=`ldd --version|head -1|grep GLIBC|sed 's/.* //'`
+		maj_glibc=`echo "$GLIBC_VERSION" | cut -d. -f1`
+		min_glibc=`echo "$GLIBC_VERSION" | cut -d. -f2`
+		echo "GNU C Library identification: $GLIBC_VERSION"
+		if [ "$maj_glibc" -gt 2 ] || { [ "$maj_glibc" -eq 2 ] && \
+		   [ "$min_glibc" -ge 34 ]; }; then
+			CONFIGURE_AC_NEW="configure.ac.new$$"
+			sed 's/^# \(AC_SYS_YEAR2038_RECOMMENDED\)/\1/' \
+				<configure.ac >"$CONFIGURE_AC_NEW"
+			cmp -s configure.ac "$CONFIGURE_AC_NEW" || \
+			cat "$CONFIGURE_AC_NEW" >configure.ac
+			rm -f "$CONFIGURE_AC_NEW"
+			echo 'Setup to ensure time_t is Y2038-safe.'
+		fi
+	fi
+fi
+
 echo "$AUTORECONF identification: $AUTORECONFVERSION"
 "$AUTORECONF" -f