1 files changed, 41 insertions, 0 deletions
diff --git a/testing/libfuzzer/libfuzzer_exports_mac.h b/testing/libfuzzer/libfuzzer_exports_mac.h
new file mode 100644
index 00000000..ce34e6a0
--- /dev/null
+++ b/testing/libfuzzer/libfuzzer_exports_mac.h
@@ -0,0 +1,41 @@
+// Copyright 2021 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef TESTING_LIBFUZZER_LIBFUZZER_EXPORTS_MAC_H_
+#define TESTING_LIBFUZZER_LIBFUZZER_EXPORTS_MAC_H_
+
+// On macOS, the linker may strip symbols for functions that are not reachable
+// by the program entrypoint. Several libFuzzer functions are resolved via
+// dlsym at runtime and therefore may be dead-stripped as a result. Including
+// this header in the fuzzer's implementation file will ensure that all the
+// symbols are kept and exported.
+
+#define EXPORT_FUZZER_FUNCTION \
+  __attribute__((used)) __attribute__((visibility("default")))
+
+extern "C" {
+
+EXPORT_FUZZER_FUNCTION int LLVMFuzzerInitialize(int* argc, char*** argv);
+EXPORT_FUZZER_FUNCTION int LLVMFuzzerTestOneInput(const uint8_t* data,
+                                                  size_t size);
+EXPORT_FUZZER_FUNCTION size_t LLVMFuzzerCustomMutator(uint8_t* data,
+                                                      size_t size,
+                                                      size_t max_size,
+                                                      unsigned int seed);
+EXPORT_FUZZER_FUNCTION size_t LLVMFuzzerCustomCrossOver(const uint8_t* data1,
+                                                        size_t size1,
+                                                        const uint8_t* data2,
+                                                        size_t size2,
+                                                        uint8_t* out,
+                                                        size_t max_out_size,
+                                                        unsigned int seed);
+EXPORT_FUZZER_FUNCTION size_t LLVMFuzzerMutate(uint8_t* data,
+                                               size_t size,
+                                               size_t max_size);
+
+}  // extern "C"
+
+#undef EXPORT_FUZZER_FUNCTION
+
+#endif  // TESTING_LIBFUZZER_LIBFUZZER_EXPORTS_MAC_H_