2000-05-03 13:27:16 +04:00
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#!/bin/sh
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# Copyright (c) 1998, 1999 Sendmail, Inc. and its suppliers.
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# All rights reserved.
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#
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# By using this file, you agree to the terms and conditions set
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# forth in the LICENSE file which can be found at the top level of
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# the sendmail distribution.
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#
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#
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2000-05-03 14:50:04 +04:00
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# Id: find_m4.sh,v 8.7 1999/02/07 07:25:58 gshapiro Exp
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2000-05-03 13:27:16 +04:00
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#
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# Try to find a working M4 program.
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# If $M4 is already set, we use it, otherwise we prefer GNU m4.
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EX_UNAVAILABLE=69
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test="ifdef(\`pushdef', \`',
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\`errprint(\`You need a newer version of M4, at least as new as System V or GNU')
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include(NoSuchFile)')
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define(\`BadNumber', \`10')
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ifdef(\`BadNumber', \`', \`errprint(\`This version of m4 is broken')')"
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if [ "$M4" ]
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then
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err=`(echo "$test" | $M4) 2>&1 >/dev/null`
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code=$?
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else
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firstfound=
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ifs="$IFS"; IFS="${IFS}:"
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for m4 in gm4 gnum4 pdm4 m4
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do
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for dir in $PATH /usr/5bin /usr/ccs/bin
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do
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[ -z "$dir" ] && dir=.
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if [ -f $dir/$m4 ]
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then
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err=`(echo "$test" | $dir/$m4) 2>&1 >/dev/null`
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ret=$?
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if [ $ret -eq 0 -a "X$err" = "X" ]
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then
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M4=$dir/$m4
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code=0
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break
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else
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case "$firstfound:$err" in
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:*version\ of*)
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firstfound=$dir/$m4
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firsterr="$err"
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firstcode=$ret
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;;
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esac
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fi
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fi
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done
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[ "$M4" ] && break
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done
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IFS="$ifs"
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if [ ! "$M4" ]
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then
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if [ "$firstfound" ]
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then
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M4=$firstfound
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err="$firsterr"
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code=$firstcode
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else
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echo "ERROR: Can not locate an M4 program" >&2
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exit $EX_UNAVAILABLE
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fi
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fi
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fi
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if [ $code -ne 0 ]
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then
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echo "ERROR: Using M4=$M4: $err" | grep -v NoSuchFile >&2
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exit $EX_UNAVAILABLE
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elif [ "X$err" != "X" ]
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then
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echo "WARNING: $err" >&2
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fi
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echo $M4
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exit 0
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