fix coverage_fuzz_corpora to use the target-coverage dir

if [ -z "${LLVM_PROFILE_FILE:-}" ]; then

    echo "This script is meant to be run inside with_coverage" >&2

    echo "If you're trying to generate a coverage .html file for the fuzzing corpus, run" >&2

    echo "./maint/with_coverage ./maint/coverage_fuzz_corpora" >&2

    exit 1

fi

# set an alternative target directory so it's possible to reuse cached artifacts between coverage 

# runs of coverage and fuzzing.

export CARGO_TARGET_DIR=${CARGO_TARGET_DIR:-target-coverage}

fuzzing_target_dir="target-coverage"

for d in ./crates/*/fuzz; do

    pushd "$(dirname "$d")"

    mkdir -p "$coverage_dir/$crate"

    for fuzzer in $(cargo fuzz list); do

	# disable sanitizer to work in stable. Also make curve25519-dalek compilation much faster

        cargo fuzz coverage "$fuzzer" --sanitizer=none

        cargo fuzz coverage --target-dir "$fuzzing_target_dir" "$fuzzer" --sanitizer=none

        # we copy binary and coverage data where with_coverage expect it to be

        cp "target-coverage/x86_64-unknown-linux-gnu/release/$fuzzer" "$TOPDIR/target/debug/$crate/$fuzzer"

        cp "$fuzzing_target_dir/x86_64-unknown-linux-gnu/release/$fuzzer" "$TOPDIR/target/debug/$crate/$fuzzer"

        mv "fuzz/coverage/$fuzzer/raw" "$coverage_dir/$crate/$fuzzer"

    done

    popd