contrib/sendmail-8.14/devtools/bin/find_m4.sh

   1 #!/bin/sh
   2
   3 # Copyright (c) 1998-2001 Sendmail, Inc. and its suppliers.
   4 #       All rights reserved.
   5 #
   6 # By using this file, you agree to the terms and conditions set
   7 # forth in the LICENSE file which can be found at the top level of
   8 # the sendmail distribution.
   9 #
  10 #
  11 #       $Id: find_m4.sh,v 8.13 2001/01/23 01:47:45 gshapiro Exp $
  12 #
  13
  14 # Try to find a working M4 program.
  15 # If $M4 is already set, we use it, otherwise we prefer GNU m4.
  16
  17 EX_UNAVAILABLE=69
  18
  19 test="ifdef(\`pushdef', \`',
  20 \`errprint(\`You need a newer version of M4, at least as new as System V or GNU')
  21 include(NoSuchFile)')
  22 define(\`BadNumber', \`10')
  23 ifdef(\`BadNumber', \`',
  24 \`errprint(\`This version of m4 is broken: trailing zero problem')
  25 include(NoSuchFile)')
  26 define(\`LongList', \` assert.c debug.c exc.c heap.c match.c rpool.c strdup.c strerror.c strl.c clrerr.c fclose.c feof.c ferror.c fflush.c fget.c fpos.c findfp.c flags.c fopen.c fprintf.c fpurge.c fput.c fread.c fscanf.c fseek.c fvwrite.c fwalk.c fwrite.c get.c makebuf.c put.c refill.c rewind.c rget.c setvbuf.c smstdio.c snprintf.c sscanf.c stdio.c strio.c syslogio.c ungetc.c vasprintf.c vfprintf.c vfscanf.c vprintf.c vsnprintf.c vsprintf.c vsscanf.c wbuf.c wsetup.c stringf.c xtrap.c strto.c test.c path.c strcasecmp.c signal.c clock.c config.c shm.c ')
  27 define(\`SameList', \`substr(LongList, 0, index(LongList, \`.'))\`'substr(LongList, index(LongList, \`.'))')
  28 ifelse(len(LongList), len(SameList), \`',
  29 \`errprint(\`This version of m4 is broken: length problem')
  30 include(NoSuchFile)')"
  31
  32 if [ "$M4" ]
  33 then
  34         err="`(echo "$test" | $M4) 2>&1 >/dev/null`"
  35         code=$?
  36 else
  37         firstfound=
  38         ifs="$IFS"; IFS="${IFS}:"
  39         for m4 in gm4 gnum4 pdm4 m4
  40         do
  41                 for dir in $PATH /usr/5bin /usr/ccs/bin
  42                 do
  43                         [ -z "$dir" ] && dir=.
  44                         if [ -f $dir/$m4 ]
  45                         then
  46                                 err="`(echo "$test" | $dir/$m4) 2>&1 >/dev/null`"
  47                                 ret=$?
  48                                 if [ $ret -eq 0 -a "X$err" = "X" ]
  49                                 then
  50                                         M4=$dir/$m4
  51                                         code=0
  52                                         break
  53                                 else
  54                                         case "$firstfound:$err" in
  55                                           :*version\ of*)
  56                                                 firstfound=$dir/$m4
  57                                                 firsterr="$err"
  58                                                 firstcode=$ret
  59                                                 ;;
  60                                         esac
  61                                 fi
  62                         fi
  63                 done
  64                 [ "$M4" ] && break
  65         done
  66         IFS="$ifs"
  67         if [ ! "$M4" ]
  68         then
  69                 if [ "$firstfound" ]
  70                 then
  71                         M4=$firstfound
  72                         err="$firsterr"
  73                         code=$firstcode
  74                 else
  75                         echo "ERROR: Can not locate an M4 program" >&2
  76                         exit $EX_UNAVAILABLE
  77                 fi
  78         fi
  79 fi
  80 if [ $code -ne 0 ]
  81 then
  82         echo "ERROR: Using M4=$M4: $err" | grep -v NoSuchFile >&2
  83         exit $EX_UNAVAILABLE
  84 elif [ "X$err" != "X" ]
  85 then
  86         echo "WARNING: $err" >&2
  87 fi
  88 echo $M4
  89 exit 0