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diff --git a/src/contrib/asan.h b/src/contrib/asan.h
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+/* Copyright (C) 2015 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+/*
+ * see sanitizer/asan_interface.h in compiler-rt (LLVM)
+ */
+#ifndef __has_feature
+ #define __has_feature(feature) 0
+#endif
+#if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
+ void __asan_poison_memory_region(void const volatile *addr, size_t size);
+ void __asan_unpoison_memory_region(void const volatile *addr, size_t size);
+ #define ASAN_POISON_MEMORY_REGION(addr, size) \
+ __asan_poison_memory_region((addr), (size))
+ #define ASAN_UNPOISON_MEMORY_REGION(addr, size) \
+ __asan_unpoison_memory_region((addr), (size))
+#else
+ #define ASAN_POISON_MEMORY_REGION(addr, size) \
+ ((void)(addr), (void)(size))
+ #define ASAN_UNPOISON_MEMORY_REGION(addr, size) \
+ ((void)(addr), (void)(size))
+#endif