Broken binary on 64-bit Windows

[seishun]

I might be doing something wrong, but it seems binding.cc gets built for x64, while the Rust code gets built for x86. This causes linker errors when this crate is used: denoland/deno#3716

Steps:

1. Clone the repo and run cargo build -vv.
2. Open target/debug/librusty_v8.rlib in 7-Zip, extract rusty_v8/binding.obj and one of the Rust .o files, compare their dumpbin /headers outputs.

Expected: same "machine" values.

Actual: Rust object files have 14C machine (x86), binding.obj has 8664 machine (x64).

[piscisaureus]

What does the output of rustup show look like?

[seishun]

Default host: i686-pc-windows-msvc
rustup home:  C:\Users\Nikolai\.rustup

stable-i686-pc-windows-msvc (default)
rustc 1.41.0 (5e1a79984 2020-01-27)

[piscisaureus]

We don't support building Deno for 32-bit x86 targets, and I'm not sure we ever will.
So i'd suggest to install the 64-bit rust toolchain. I'm not really sure how to do this, so I'd suggest:

1. Uninstall rust / rustup.
2. Install rust using rustup-init x64 from https://win.rustup.rs/x86_64

This is what you're after:

D:\deno2>rustup show
Default host: x86_64-pc-windows-msvc
rustup home:  C:\Users\BertBelder\.rustup

installed toolchains
--------------------

stable-x86_64-pc-windows-msvc (default)

active toolchain
----------------

stable-x86_64-pc-windows-msvc (default)

[seishun]

Should that be mentioned in the docs here (and in deno)? Currently, installing Rust from https://www.rust-lang.org/tools/install will get you a 32-bit toolchain by default (although it seems it's going to change, see rust-lang/rustup#2186 and rust-lang/www.rust-lang.org#1004).

[ry]

@seishun yes some comments in the manual would be helpful.