Can't fuzz after updating.

[dpc]

I'm trying to update our toolchains, and honggfuzz couldn't compile due to some C++ nonsense:

  mangle.c:419:6: error: initializer-string for character array is too long, array size is 8 but initializer has size 9 (including the null terminating charact
er); did you mean to use the 'nonstring' attribute? [-Werror,-Wunterminated-string-initialization]
    419 |     {"\x00\x00\x00\x00\x00\x00\x00\x07", 8},
        |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

because "C++ is sooo stable and mature" that stuff in C++ has only 25% chance of compiling after updating toolchain - I'm used to it now. But anyway, that is not the issue I'm reporting - it only caused me to try to update honggfuzz + cargo-fuzz. And now I'm getting:

  = note: some arguments are omitted. use `--verbose` to show all linker arguments
  = note: /nix/store/416ykpc2bksb90sd1ia8cybxb3p83mrd-binutils-2.44/bin/ld: /home/dpc/lab/fedimint/fedimint/hfuzz_target/x86_64-unknown-linux-gnu/release/deps/
librand-9c0b8cf3b9110dc8.rlib(rand-9c0b8cf3b9110dc8.rand.12a78ba78620fe8b-cgu.1.rcgu.o): in function `core::fmt::Write::write_char':
          rand.12a78ba78620fe8b-cgu.1:(.text._ZN4core3fmt5Write10write_char17h3c15b5565e32a64bE[_ZN4core3fmt5Write10write_char17h3c15b5565e32a64bE]+0x121): und
efined reference to `std::io::Write::write_all'
          /nix/store/416ykpc2bksb90sd1ia8cybxb3p83mrd-binutils-2.44/bin/ld: /home/dpc/lab/fedimint/fedimint/hfuzz_target/x86_64-unknown-linux-gnu/release/deps/
librand-9c0b8cf3b9110dc8.rlib(rand-9c0b8cf3b9110dc8.rand.12a78ba78620fe8b-cgu.1.rcgu.o): in function `<std::io::default_write_fmt::Adapter<T> as core::fmt::Wri
te>::write_str':
          rand.12a78ba78620fe8b-cgu.1:(.text._ZN81_$LT$std..io..default_write_fmt..Adapter$LT$T$GT$$u20$as$u20$core..fmt..Write$GT$9write_str17h47f068068812540
eE[_ZN81_$LT$std..io..default_write_fmt..Adapter$LT$T$GT$$u20$as$u20$core..fmt..Write$GT$9write_str17h47f068068812540eE]+0x24): undefined reference to `std::io
::Write::write_all'
          /nix/store/416ykpc2bksb90sd1ia8cybxb3p83mrd-binutils-2.44/bin/ld: /home/dpc/lab/fedimint/fedimint/hfuzz_target/x86_64-unknown-linux-gnu/release/deps/
libiroh_base-61a06741392e63f9.rlib(iroh_base-61a06741392e63f9.iroh_base.f113db48b0af61e8-cgu.12.rcgu.o): in function `<alloc::string::String as core::fmt::Writ
e>::write_char':
          iroh_base.f113db48b0af61e8-cgu.12:(.text._ZN58_$LT$alloc..string..String$u20$as$u20$core..fmt..Write$GT$10write_char17hdcc0152c62e4d6faE[_ZN58_$LT$al
loc..string..String$u20$as$u20$core..fmt..Write$GT$10write_char17hdcc0152c62e4d6faE]+0xb5): undefined reference to `alloc::vec::Vec<T,A>::reserve'
          /nix/store/416ykpc2bksb90sd1ia8cybxb3p83mrd-binutils-2.44/bin/ld: /home/dpc/lab/fedimint/fedimint/hfuzz_target/x86_64-unknown-linux-gnu/release/deps/
libiroh_relay-f6b07a480904a283.so: hidden symbol `_ZN5alloc3vec16Vec$LT$T$C$A$GT$7reserve17h750e5744f5b892dcE' isn't defined
          /nix/store/416ykpc2bksb90sd1ia8cybxb3p83mrd-binutils-2.44/bin/ld: final link failed: bad value
          clang: error: linker command failed with exit code 1 (use -v to see invocation)

and I have no idea what to do about it. I tried multiple clang versions provided by Nix, I tried Rust 1.89 and 1.91. I I tried various honggfuzz versions and either they hit the original C++ compilation issue (IIRC 0.5.55 and 0.5.56) or the new Rust toolchain one (0.5.57 and 0.5.58). I tried to disable LTO in release profile as I've googled some similar issues like that. I would appreciate any ideas how to fix it. Everything else (whole extensive CI and linting, compilation, xcompilation, etc.) seems to be working, but I'm blocked on fuzzing being broken.