This package contains binaries for running fuzz testing.

Building the binary requires additional arguments be passed to the Swift compiler:

swift build \
  -Xswiftc -sanitize=fuzzer,address \
  -Xswiftc -parse-as-library

Note also that on macOS the Swift toolchain shipped with Xcode does not currently include fuzzing support and one must use a toolchain from swift.org. Building on macOS therefore requires the above command be run via xcrun:

xcrun --toolchain swift \
  swift build \
    -Xswiftc -sanitize=fuzzer,address \
    -Xswiftc -parse-as-library

The FailCases directory contains fuzzing test input which previously caused failures in gRPC.