Do fuzzing test for tinyobjloader

• ParseFromString

• clang with fuzzer support(-fsanitize=fuzzer. at least clang 8.0 should work)

$ sudo apt install clang++-8
$ sudo apt install libfuzzer-8-dev

Optionally, if you didn't set update-alternatives you can set clang++ to point to clang++8

$ sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-8 10
$ sudo update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-8 10

Fuzz target is compiled with the rest of the project when environment variable LIB_FUZZING_ENGINE is defined when running cmake With clang, you can compile with

$ export LIB_FUZZING_ENGINE=-fsanitize=fuzzer
$ mkdir build && cd build
$ cmake .. -DBUILD_SHARED_LIBS=OFF
$ make -j $(nproc)

Increase memory limit. e.g. -rss_limit_mb=2000 cf libfuzzer.info for all options

$ ./fuzz_ParseFromString -rss_limit_mb=2000

See regression_runner/