contrib: filter compat lines

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

kernel-tree-scripts/filter-compat-defines.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+silent=0
+level=0
+ifs=( )
+
+while IFS= read -r line; do
+	if [[ $line =~ ^[[:space:]]*(#if.*) ]]; then
+		ifs[level++]=0
+		if [[ ${BASH_REMATCH[1]} == "#ifndef COMPAT_CANNOT_"* ]]; then
+			ifs[level-1]=-1
+			continue
+		elif [[ ${BASH_REMATCH[1]} == "#ifdef COMPAT_CANNOT_"* ]]; then
+			ifs[level-1]=1
+			((++silent))
+			continue
+		fi
+	elif [[ $line =~ ^[[:space:]]*#else && ${ifs[level-1]} -ne 0 ]]; then
+		((ifs[level-1]*=-1))
+		((silent+=ifs[level-1]))
+		continue
+	elif [[ $line =~ ^[[:space:]]*#endif ]]; then
+		((--level))
+		[[ ${ifs[level]} -eq 1 ]] && ((--silent))
+		[[ ${ifs[level]} -ne 0 ]] && continue
+	fi
+	[[ $silent -eq 0 ]] && printf '%s\n' "$line"
+done < "$1"

src/Makefile

@@ -68,7 +68,7 @@ coccicheck: clean
 	@$(MAKE) -C $(KERNELDIR) M=$(PWD) CONFIG_WIREGUARD_DEBUG=y coccicheck MODE=report
 
 cloc: clean
-	cloc $(wildcard *.c) $(wildcard *.h)
+	@cloc --skip-uniqueness --by-file --extract-with="$$(readlink -f ../contrib/kernel-tree/filter-compat-defines.sh) >FILE< > \$$(basename >FILE<)" $(wildcard *.c) $(wildcard *.h)
 
 -include tests/debug.mk