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#!/bin/sh
# Copyright (c) 1998 Sendmail, Inc. All rights reserved.
#
# By using this file, you agree to the terms and conditions set
# forth in the LICENSE file which can be found at the top level of
# the sendmail distribution.
#
#
# @(#)find_m4.sh 8.4 (Berkeley) 5/19/98
#
# Try to find a working M4 program.
# If $M4 is already set, we use it, otherwise we prefer GNU m4.
EX_UNAVAILABLE=69
test="ifdef(\`pushdef', \`',
\`errprint(\`You need a newer version of M4, at least as new as System V or GNU')
include(NoSuchFile)')
define(\`BadNumber', \`10')
ifdef(\`BadNumber', \`', \`errprint(\`This version of m4 is broken')')"
if [ "$M4" ]
then
err=`(echo "$test" | $M4) 2>&1 >/dev/null`
code=$?
else
firstfound=
ifs="$IFS"; IFS="${IFS}:"
for m4 in gm4 gnum4 pdm4 m4
do
for dir in $PATH /usr/5bin /usr/ccs/bin
do
[ -z "$dir" ] && dir=.
if [ -f $dir/$m4 ]
then
err=`(echo "$test" | $dir/$m4) 2>&1 >/dev/null`
ret=$?
if [ $ret -eq 0 -a "X$err" = "X" ]
then
M4=$dir/$m4
code=0
break
else
case "$firstfound:$err" in
:*version\ of*)
firstfound=$dir/$m4
firsterr="$err"
firstcode=$ret
;;
esac
fi
fi
done
[ "$M4" ] && break
done
IFS="$ifs"
if [ ! "$M4" ]
then
if [ "$firstfound" ]
then
M4=$firstfound
err="$firsterr"
code=$firstcode
else
echo "ERROR: Can not locate an M4 program" >&2
exit $EX_UNAVAILABLE
fi
fi
fi
if [ $code -ne 0 ]
then
echo "ERROR: Using M4=$M4: $err" | grep -v NoSuchFile >&2
exit $EX_UNAVAILABLE
elif [ "X$err" != "X" ]
then
echo "WARNING: $err" >&2
fi
echo $M4
exit 0
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