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diff --git a/tools/fuzzing/libfuzzer/Makefile.in b/tools/fuzzing/libfuzzer/Makefile.in
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+++ b/tools/fuzzing/libfuzzer/Makefile.in
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+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+include $(topsrcdir)/config/rules.mk
+
+# According to the LLVM docs, LibFuzzer isn't supposed to be built with any
+# sanitizer flags and in fact, building it with ASan coverage currently causes
+# Clang 3.9+ to crash, so we filter out all sanitizer-related flags here.
+CXXFLAGS := $(filter-out -fsanitize%,$(CXXFLAGS))
+CFLAGS := $(filter-out -fsanitize%,$(CFLAGS))
+LDFLAGS := $(filter-out -fsanitize%,$(LDFLAGS))