The Tcpdump Group git mirrors - tcpdump/blob - autogen.sh

   1 #!/bin/sh -e
   2
   3 : "${AUTORECONF:=autoreconf}"
   4 : "${BUILD_YEAR2038:=no}"
   5
   6 AUTORECONFVERSION=`$AUTORECONF --version 2>&1 | grep "^autoreconf" | sed 's/.*) *//'`
   7
   8 maj=`echo "$AUTORECONFVERSION" | cut -d. -f1`
   9 min=`echo "$AUTORECONFVERSION" | cut -d. -f2`
  10 # The minimum required version of autoconf is currently 2.69.
  11 if [ "$maj" = "" ] || [ "$min" = "" ] || \
  12    [ "$maj" -lt 2 ] || { [ "$maj" -eq 2 ] && [ "$min" -lt 69 ]; }; then
  13         cat >&2 <<-EOF
  14         Please install the 'autoconf' package version 2.69 or later.
  15         If version 2.69 or later is already installed and there is no
  16         autoconf default, it may be necessary to set the AUTORECONF
  17         environment variable to enable the one to use, like:
  18         AUTORECONF=autoreconf-2.69 ./autogen.sh
  19         or
  20         AUTORECONF=autoreconf-2.71 ./autogen.sh
  21         EOF
  22         exit 1
  23 fi
  24
  25 echo "$AUTORECONF identification: $AUTORECONFVERSION"
  26
  27 # On Linux, if Autoconf version >= 2.72 and GNU C Library version >= 2.34,
  28 # s/AC_SYS_LARGEFILE/AC_SYS_YEAR2038_RECOMMENDED/ to ensure time_t
  29 # is Y2038-safe.
  30 if [ "$BUILD_YEAR2038" = yes ] && [ "`uname -s`" = Linux ]; then
  31         if [ "$maj" -gt 2 ] || { [ "$maj" -eq 2 ] && [ "$min" -ge 72 ]; }; then
  32                 GLIBC_VERSION=`ldd --version|head -1|grep GLIBC|sed 's/.* //'`
  33                 maj_glibc=`echo "$GLIBC_VERSION" | cut -d. -f1`
  34                 min_glibc=`echo "$GLIBC_VERSION" | cut -d. -f2`
  35                 echo "GNU C Library identification: $GLIBC_VERSION"
  36                 if [ "$maj_glibc" -gt 2 ] || { [ "$maj_glibc" -eq 2 ] && \
  37                    [ "$min_glibc" -ge 34 ]; }; then
  38                         CONFIGURE_AC_NEW="configure.ac.new$$"
  39                         sed 's/^# \(AC_SYS_YEAR2038_RECOMMENDED\)/\1/' \
  40                                 <configure.ac >"$CONFIGURE_AC_NEW"
  41                         cmp -s configure.ac "$CONFIGURE_AC_NEW" || \
  42                         cat "$CONFIGURE_AC_NEW" >configure.ac
  43                         rm -f "$CONFIGURE_AC_NEW"
  44                         echo 'Setup to ensure time_t is Y2038-safe.'
  45                 fi
  46         fi
  47 fi
  48
  49 # configure.ac is an Autoconf 2.69 file, but it works as expected even with
  50 # Autoconf 2.72.  However, in Autoconf versions 2.70 and later obsolete
  51 # construct warnings are enabled by default, which adds varying (depending on
  52 # the branch) amount of noise to the build matrix output, so provide a means
  53 # to silence that.
  54 env ${AUTOCONF_WARNINGS:+WARNINGS="$AUTOCONF_WARNINGS"} "$AUTORECONF" -f
  55
  56 # Autoconf 2.71 adds a blank line after the final "exit 0" on Linux, but not
  57 # on OpenBSD.  Remove this difference to make it easier to compare the result
  58 # of "make releasetar" across different platforms.  From sed one-liners:
  59 # "delete all trailing blank lines at end of file (works on all seds)".  Don't
  60 # use mktemp(1) because AIX does not have it.
  61 CONFIGURE_NEW="configure.new$$"
  62 sed -e :a -e '/^\n*$/{$d;N;ba' -e '}' <configure >"$CONFIGURE_NEW"
  63 cmp -s configure "$CONFIGURE_NEW" || cat "$CONFIGURE_NEW" >configure
  64 rm -f "$CONFIGURE_NEW"