I don't think we need to concern ourselves with cross awk compatibility here.
Despite the misleading comment, /usr/bin/awk supports toupper.
Index: makesyscalls.sh
===================================================================
RCS file: /home/cvs/src/sys/kern/makesyscalls.sh,v
retrieving revision 1.15
diff -u -p -r1.15 makesyscalls.sh
--- makesyscalls.sh 9 Dec 2021 00:26:10 -0000 1.15
+++ makesyscalls.sh 1 May 2022 04:45:49 -0000
@@ -70,28 +70,6 @@ sysent="sysent.switch"
trap "rm $sysdcl $sysprotos $sysent" 0
-# Awk program (must support nawk extensions)
-# Use "awk" at Berkeley, "nawk" or "gawk" elsewhere.
-awk=${AWK:-awk}
-
-# Does this awk have a "toupper" function? (i.e. is it GNU awk)
-isgawk=`$awk 'BEGIN { print toupper("true"); exit; }' 2>/dev/null`
-
-# If this awk does not define "toupper" then define our own.
-if [ "$isgawk" = TRUE ] ; then
- # GNU awk provides it.
- toupper=
-else
- # Provide our own toupper()
- toupper='
-function toupper(str) {
- _toupper_cmd = "echo "str" |tr a-z A-Z"
- _toupper_cmd | getline _toupper_str;
- close(_toupper_cmd);
- return _toupper_str;
-}'
-fi
-
# before handing it off to awk, make a few adjustments:
# (1) insert spaces around {, }, (, ), *, and commas.
# (2) get rid of any and all dollar signs (so that rcs id use safe)
@@ -111,8 +89,7 @@ s/\$//g
2,${
/^#/!s/\([{}()*,]\)/ \1 /g
}
-' < $2 | $awk "
-$toupper
+' < $2 | awk "
BEGIN {
# to allow nested #if/#else/#endif sets
savedepth = 0
