1 files changed, 89 insertions, 0 deletions
diff --git a/devtools/bin/find_m4.sh b/devtools/bin/find_m4.sh
new file mode 100755
index 000000000000..d83073715a7d
--- /dev/null
+++ b/devtools/bin/find_m4.sh
@@ -0,0 +1,89 @@
+#!/bin/sh
+
+# Copyright (c) 1998-2001 Sendmail, Inc. and its suppliers.
+#	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.
+#
+#
+#       $Id: find_m4.sh,v 8.13 2001/01/23 01:47:45 gshapiro Exp $
+#
+
+# Try to find a working M4 program.
+# If $M4 is already set, we use it, otherwise we prefer GNU m4.
+
+EX_UNAVAILABLE=69
+
+test="ifdef(\`pushdef', \`',
+\`errprint(\`You need a newer version of M4, at least as new as System V or GNU')
+include(NoSuchFile)')
+define(\`BadNumber', \`10')
+ifdef(\`BadNumber', \`',
+\`errprint(\`This version of m4 is broken: trailing zero problem')
+include(NoSuchFile)')
+define(\`LongList', \` assert.c debug.c exc.c heap.c match.c rpool.c strdup.c strerror.c strl.c clrerr.c fclose.c feof.c ferror.c fflush.c fget.c fpos.c findfp.c flags.c fopen.c fprintf.c fpurge.c fput.c fread.c fscanf.c fseek.c fvwrite.c fwalk.c fwrite.c get.c makebuf.c put.c refill.c rewind.c rget.c setvbuf.c smstdio.c snprintf.c sscanf.c stdio.c strio.c syslogio.c ungetc.c vasprintf.c vfprintf.c vfscanf.c vprintf.c vsnprintf.c vsprintf.c vsscanf.c wbuf.c wsetup.c stringf.c xtrap.c strto.c test.c path.c strcasecmp.c signal.c clock.c config.c shm.c ')
+define(\`SameList', \`substr(LongList, 0, index(LongList, \`.'))\`'substr(LongList, index(LongList, \`.'))')
+ifelse(len(LongList), len(SameList), \`',
+\`errprint(\`This version of m4 is broken: length problem')
+include(NoSuchFile)')"
+
+if [ "$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