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README.md

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Some initial states

lscpu 
~ » lscpu

Architecture:            aarch64
  CPU op-mode(s):        32-bit, 64-bit
  Byte Order:            Little Endian
CPU(s):                  4
  On-line CPU(s) list:   0-3
Vendor ID:               ARM
  Model name:            Neoverse-N1
    Model:               1
    Thread(s) per core:  1
    Core(s) per cluster: 4
    Socket(s):           -
    Cluster(s):          1
    Stepping:            r3p1
    BogoMIPS:            50.00
    Flags:               fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm lrcpc dcpop asimddp ssbs
NUMA:                    
  NUMA node(s):          1
  NUMA node0 CPU(s):     0-3
Vulnerabilities:         
  Gather data sampling:  Not affected
  Itlb multihit:         Not affected
  L1tf:                  Not affected
  Mds:                   Not affected
  Meltdown:              Not affected
  Mmio stale data:       Not affected
  Retbleed:              Not affected
  Spec store bypass:     Mitigation; Speculative Store Bypass disabled via prctl
  Spectre v1:            Mitigation; __user pointer sanitization
  Spectre v2:            Mitigation; CSV2, BHB
  Srbds:                 Not affected
  Tsx async abort:       Not affected
rustup 
~ » rustup -V
rustup 1.26.0 (5af9b9484 2023-04-05)
info: This is the version for the rustup toolchain manager, not the rustc compiler.
info: The currently active `rustc` version is `rustc 1.72.0 (5680fa18f 2023-08-23)`
gcc 
~ » gcc -v

Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/aarch64-linux-gnu/11/lto-wrapper
Target: aarch64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 11.4.0-1ubuntu1~22.04' --with-bugurl=file:///usr/share/doc/gcc-11/README.Bugs --enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-11 --program-prefix=aarch64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-libquadmath --disable-libquadmath-support --enable-plugin --enable-default-pie --with-system-zlib --enable-libphobos-checking=release --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --enable-fix-cortex-a53-843419 --disable-werror --enable-checking=release --build=aarch64-linux-gnu --host=aarch64-linux-gnu --target=aarch64-linux-gnu --with-build-config=bootstrap-lto-lean --enable-link-serialization=2
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 11.4.0 (Ubuntu 11.4.0-1ubuntu1~22.04)

Let's build

git clone -b testnet-alpha-0 https://github.com/fleek-network/lightning.git ~/fleek-network/lightning
cd fleek-network/lightning
cargo clean && cargo update
cargo +stable build --release

we see the following

error: linking with `cc` failed: exit status: 1
# ... wall of text
# ... the key error is ↴
= note: /usr/bin/ld: /home/ubuntu/fleek-network/lightning/target/release/deps/libblake3-a927e9b36d695ff0.rlib(blake3-a927e9b36d695ff0.blake3.91a53ea05847a7a5-cgu.0.rcgu.o): in function `blake3_compress_in_place_portable':
          /home/ubuntu/.cargo/registry/src/index.crates.io-6f17d22bba15001f/blake3-1.4.1/src/ffi_neon.rs:45: multiple definition of `blake3_compress_in_place_portable'; /home/ubuntu/fleek-network/lightning/target/release/deps/libfleek_blake3-990c4c0cfb4eaa87.rlib(fleek_blake3-990c4c0cfb4eaa87.fleek_blake3.4f11e9370af31773-cgu.0.rcgu.o):/home/ubuntu/.cargo/registry/src/index.crates.io-6f17d22bba15001f/fleek-blake3-1.4.1/src/ffi_neon.rs:45: first defined here

As a result of the research, after discarding the unrelated variants and testing we find out that gcc 11 does not allow multiple definition (or something like that), ok, let's allow it.

RUSTFLAGS="-Clink-arg=-Wl,--allow-multiple-definition" cargo +stable build --release

Now we get this:

warning: Linking globals named 'blake3_compress_in_place_portable': symbol multiply defined!

error: failed to load bitcode of module "fleek_blake3-990c4c0cfb4eaa87.fleek_blake3.4f11e9370af31773-cgu.0.rcgu.o":

Fixing lto in Cargo.toml (maybe it possible with RUSTFLAGS idk), change lto = true to lto = "thin"

vim Cargo.toml
...
 68 [profile.release]
 ...
 71 # currently enabled, may increase build time, but runtime faster, can set to `"thin"`.
 72 lto = "thin"
 ...

Rebuild it

RUSTFLAGS="-Clink-arg=-Wl,--allow-multiple-definition" cargo +stable build --release 
...
Finished release [optimized + debuginfo] target(s) in 19m 39s
...
lightning-node -V
lightning-node 0.1.0

lightning-node help
Usage: lightning-node [OPTIONS] <COMMAND>

Commands:
  run           Start the node
  keys          Handle keys
  print-config  Print the loaded configuration
  help          Print this message or the help of the given subcommand(s)

Options:
  -c, --config <CONFIG>      Path to the toml configuration file [default: ~/.lightning/config.toml]
      --with-mock-consensus  Determines that we should be using the mock consensus backend
  -v...                      Increases the level of verbosity (the max level is -vvv)
      --log-location         Print code location on console logs
  -h, --help                 Print help
  -V, --version              Print version

Done.

Cross-compilation x86-64 >> aarch64 is also possible but has its own specific aspects.