Update test/fuzzing/README

TESTING.md

@@ -39,11 +39,7 @@ ninja -C build
 
 ## Test with the Fuzzer
 
-```shell
-CXXFLAGS="-fsanitize=address,fuzzer-no-link" meson fuzzbuild --default-library=static -Dfuzzer_ldflags="-fsanitize=address,fuzzer" -Dexperimental_api=true
-ninja -Cfuzzbuild test/fuzzing/hb-{shape,draw,subset,set}-fuzzer
-fuzzbuild/test/fuzzing/hb-subset-fuzzer test/fuzzing/fonts
-```
+FOr fuzzing, see `test/fuzzing/README.md`.
 
 ## Profiling
 

test/fuzzing/README

@@ -1,21 +0,0 @@
-In order to build the fuzzer one needs to build HarfBuzz and
-harfbuzz/test/fuzzing/hb-fuzzer.cc with:
-  - Using the most recent Clang
-  - With -fsanitize=address (or =undefined, or a combination)
-  - With -fsanitize-coverage=edge[,8bit-counters,trace-cmp]
-  - With various defines that limit worst case exponential behavior.
-    See FUZZING_CPPFLAGS in harfbuzz/src/Makefile.am for the list.
-  - link against libFuzzer
-
-To run the fuzzer one needs to first obtain a test corpus as a directory
-containing interesting fonts.  A good starting point is inside
-harfbuzz/test/shaping/fonts/fonts/.
-Then, run the fuzzer like this:
-   ./hb-fuzzer -max_len=2048 CORPUS_DIR
-Where max_len specifies the maximal length of font files to handle.
-The smaller the faster.
-
-For more details consult the following locations:
-  - http://llvm.org/docs/LibFuzzer.html or
-  - https://github.com/google/libfuzzer-bot/tree/master/harfbuzz
-  - https://github.com/harfbuzz/harfbuzz/issues/139

test/fuzzing/README.md

@@ -0,0 +1,17 @@
+To build the fuzzers with libFuzzer to perform actual fuzzing, build with:
+
+```shell
+CXX=clang++ CXXFLAGS="-fsanitize=address,fuzzer-no-link" meson fuzzbuild --default-library=static -Dfuzzer_ldflags="-fsanitize=address,fuzzer"
+
+ninja -Cfuzzbuild
+```
+
+Then, run the fuzzer like this:
+
+fuzzbuild/test/fuzzing/hb-{shape,draw,subset,set}-fuzzer [-max_len=2048] [CORPUS_DIR]
+
+Where max_len specifies the maximal length of font files to handle.
+The smaller the faster.
+
+For more details consult the following locations:
+  - http://llvm.org/docs/LibFuzzer.html