From 502498c4fc05ae9eaaf3db6014f38d0033085859 Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Wed, 11 Oct 2017 05:26:04 +0200
Subject: contrib: filter compat lines

---
 contrib/kernel-tree/filter-compat-defines.sh | 28 ++++++++++++++++++++++++++++
 src/Makefile                                 |  2 +-
 2 files changed, 29 insertions(+), 1 deletion(-)
 create mode 100755 contrib/kernel-tree/filter-compat-defines.sh

diff --git a/contrib/kernel-tree/filter-compat-defines.sh b/contrib/kernel-tree/filter-compat-defines.sh
new file mode 100755
index 0000000..9d2cc08
--- /dev/null
+++ b/contrib/kernel-tree/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 < "$1"
diff --git a/src/Makefile b/src/Makefile
index 0a9f734..f933eb1 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -68,7 +68,7 @@ coccicheck: clean
 	@$(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
 
-- 
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