jak-project/third-party/fmt/test/fuzzing/README.md
Tyler Wilding 60db0e5ef9
deps: update fmt to latest version (#3403)
This updates `fmt` to the latest version and moves to just being a copy
of their repo to make updating easier (no editing their cmake / figuring
out which files to minimally include).

The motivation for this is now that we switched to C++ 20, there were a
ton of deprecated function usages that is going away in future compiler
versions. This gets rid of all those warnings.
2024-03-05 22:11:52 -05:00

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# Running the fuzzers locally
There is a [helper script](build.sh) to build the fuzzers, which has only been
tested on Debian and Ubuntu linux so far. There should be no problems fuzzing on
Windows (using clang>=8) or on Mac, but the script will probably not work out of
the box.
Something along
```sh
mkdir build
cd build
export CXX=clang++
export CXXFLAGS="-fsanitize=fuzzer-no-link -DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION= -g"
cmake .. -DFMT_SAFE_DURATION_CAST=On -DFMT_FUZZ=On -DFMT_FUZZ_LINKMAIN=Off -DFMT_FUZZ_LDFLAGS="-fsanitize=fuzzer"
cmake --build .
```
should work to build the fuzzers for all platforms which clang supports.
Execute a fuzzer with for instance
```sh
cd build
export UBSAN_OPTIONS=halt_on_error=1
mkdir out_chrono
bin/fuzzer_chrono_duration out_chrono
```