fix clang flags for clang (>=9.0.0)

Author: salmonx

lessons/04/README.md

@@ -201,9 +201,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
 Compile the fuzzer:
 
 ```bash
-clang++ -g -std=c++11 -fsanitize=address -fsanitize-coverage=trace-pc-guard \
-    second_fuzzer.cc ../../libFuzzer/libFuzzer.a \
-    -o second_fuzzer
+clang++ -g -std=c++11 -fsanitize=address,fuzzer second_fuzzer.cc -o second_fuzzer
 ```
 
 Run the fuzzer:
@@ -252,9 +250,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
 Compile the fuzzer:
 
 ```bash
-clang++ -g -std=c++11 -fsanitize=address -fsanitize-coverage=trace-pc-guard \
-    third_fuzzer.cc ../../libFuzzer/libFuzzer.a \
-    -o third_fuzzer
+clang++ -g -std=c++11 -fsanitize=address,fuzzer third_fuzzer.cc -o third_fuzzer
 ```
 
 Run the fuzzer on the same corpus:
@@ -359,9 +355,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
 Compile the fuzzer:
 
 ```bash
-clang++ -g -std=c++11 -fsanitize=address -fsanitize-coverage=trace-pc-guard \
-    fourth_fuzzer.cc ../../libFuzzer/libFuzzer.a \
-    -o fourth_fuzzer
+clang++ -g -std=c++11 -fsanitize=address,fuzzer fourth_fuzzer.cc -o fourth_fuzzer
 ```
 
 and run on the empty corpus: