harfbuzz/test/fuzzing/README.md

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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