Building `0.0.125` on `i686-linux-android` fails

[ok300]

Building version 0.0.125 on 32 bit fails with

attempt to compute 184_usize - 192_usize, which would overflow

cargo ndk -t i686-linux-android build --release
...

error[E0080]: evaluation of constant value failed
   --> /home/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/lightning-0.0.125/src/routing/scoring.rs:807:46
    |
807 | const _LIQUIDITY_MAP_SIZING_CHECK_2: usize = ::core::mem::size_of::<(u64, ChannelLiquidity)>() - 192;
    |                                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ attempt to compute `184_usize - 192_usize`, which would overflow

For more information about this error, try `rustc --explain E0080`.
error: could not compile `lightning` (lib) due to 1 previous error

Maybe the 32 bit usize affects the ChannelLiquidity size calculation in _LIQUIDITY_MAP_SIZING_CHECK_2?

rust-lightning/lightning/src/routing/scoring.rs

Line 805 in 8da30df

const _LIQUIDITY_MAP_SIZING_CHECK_2: usize = ::core::mem::size_of::<(u64, ChannelLiquidity)>() - 192;

This worked fine with the previous version we used, 0.0.118.

Is this a bug, or was support for 32 bit dropped in the meantime? Thanks.

[TheBlueMatt]

Oh interesting, we do release builds on android which built fine. What version of rustc are you using?

[TheBlueMatt]

Oh, I see your struct is smaller, yea, that maybe makes sense on some 32-bit platforms on newer rustc. Will fix anyway.

[TheBlueMatt]

Should be fixed by #3422, at least.

[gcomte]

I still have this issue when trying to build 0.1.x for i686-linux-android.