Adapt to wasm32v1-none target.

[fnando]

What

Continuing #1988.

This pull requests selects the proper target based on your running rust version.

$ rustup override set 1.82.0
info: override toolchain for '/Users/fnando/Projects/stellar/hello' set to '1.82.0-aarch64-apple-darwin'

$ stellar contract build
❌ error: rust version 1.82.0 cannot be used to build contracts

$ rustup override set 1.83.0
info: override toolchain for '/Users/fnando/Projects/stellar/hello' set to '1.83.0-aarch64-apple-darwin'

$ stellar contract build
❌ error: rust version 1.83.0 cannot be used to build contracts

$ rustup override set 1.81.0
info: override toolchain for '/Users/fnando/Projects/stellar/hello' set to '1.81.0-aarch64-apple-darwin'

$ stellar contract build
ℹ️ CARGO_BUILD_RUSTFLAGS=--remap-path-prefix=/Users/fnando/.cargo/registry/src= cargo rustc --manifest-path=contracts/foo/Cargo.toml --crate-type=cdylib --target=wasm32-unknown-unknown --release
    Finished `release` profile [optimized] target(s) in 0.04s
ℹ️ Build Summary:
  Wasm File: target/wasm32-unknown-unknown/release/foo.wasm
  Wasm Hash: 89123eaa2902ec32e26db0141e2d0247e5e00846489f4d8b17d597a85466e863
  Exported Functions: 2 found
    • _
    • hello
✅ Build Complete
ℹ️ CARGO_BUILD_RUSTFLAGS=--remap-path-prefix=/Users/fnando/.cargo/registry/src= cargo rustc --manifest-path=contracts/hello_world/Cargo.toml --crate-type=cdylib --target=wasm32-unknown-unknown --release
    Finished `release` profile [optimized] target(s) in 0.04s
ℹ️ Build Summary:
  Wasm File: target/wasm32-unknown-unknown/release/hello_world.wasm
  Wasm Hash: 89123eaa2902ec32e26db0141e2d0247e5e00846489f4d8b17d597a85466e863
  Exported Functions: 2 found
    • _
    • hello
✅ Build Complete
ℹ️ CARGO_BUILD_RUSTFLAGS=--remap-path-prefix=/Users/fnando/.cargo/registry/src= cargo rustc --manifest-path=contracts/test/Cargo.toml --crate-type=cdylib --target=wasm32-unknown-unknown --release
    Finished `release` profile [optimized] target(s) in 0.04s
ℹ️ Build Summary:
  Wasm File: target/wasm32-unknown-unknown/release/test.wasm
  Wasm Hash: 89123eaa2902ec32e26db0141e2d0247e5e00846489f4d8b17d597a85466e863
  Exported Functions: 2 found
    • _
    • hello
✅ Build Complete

$ rustup override set 1.86.0
info: override toolchain for '/Users/fnando/Projects/stellar/hello' set to '1.86.0-aarch64-apple-darwin'

$ stellar contract build
ℹ️ CARGO_BUILD_RUSTFLAGS=--remap-path-prefix=/Users/fnando/.cargo/registry/src= cargo rustc --manifest-path=contracts/foo/Cargo.toml --crate-type=cdylib --target=wasm32v1-none --release
    Finished `release` profile [optimized] target(s) in 0.11s
ℹ️ Build Summary:
  Wasm File: target/wasm32v1-none/release/foo.wasm
  Wasm Hash: c358c50c6b37d298a28552ff8a901d73b4eb92647938f0635918c1bef3bf2ff8
  Exported Functions: 2 found
    • _
    • hello
✅ Build Complete
ℹ️ CARGO_BUILD_RUSTFLAGS=--remap-path-prefix=/Users/fnando/.cargo/registry/src= cargo rustc --manifest-path=contracts/hello_world/Cargo.toml --crate-type=cdylib --target=wasm32v1-none --release
    Finished `release` profile [optimized] target(s) in 0.04s
ℹ️ Build Summary:
  Wasm File: target/wasm32v1-none/release/hello_world.wasm
  Wasm Hash: c358c50c6b37d298a28552ff8a901d73b4eb92647938f0635918c1bef3bf2ff8
  Exported Functions: 2 found
    • _
    • hello
✅ Build Complete
ℹ️ CARGO_BUILD_RUSTFLAGS=--remap-path-prefix=/Users/fnando/.cargo/registry/src= cargo rustc --manifest-path=contracts/test/Cargo.toml --crate-type=cdylib --target=wasm32v1-none --release
    Finished `release` profile [optimized] target(s) in 0.04s
ℹ️ Build Summary:
  Wasm File: target/wasm32v1-none/release/test.wasm
  Wasm Hash: c358c50c6b37d298a28552ff8a901d73b4eb92647938f0635918c1bef3bf2ff8
  Exported Functions: 2 found
    • _
    • hello
✅ Build Complete

$ rustup override set 1.84.0
info: override toolchain for '/Users/fnando/Projects/stellar/hello' set to '1.84.0-aarch64-apple-darwin'

$ stellar contract build
ℹ️ CARGO_BUILD_RUSTFLAGS=--remap-path-prefix=/Users/fnando/.cargo/registry/src= cargo rustc --manifest-path=contracts/foo/Cargo.toml --crate-type=cdylib --target=wasm32v1-none --release
   Compiling proc-macro2 v1.0.86
   Compiling unicode-ident v1.0.13
   Compiling serde v1.0.210
   Compiling serde_json v1.0.128
   Compiling itoa v1.0.11
   Compiling ryu v1.0.18
   Compiling memchr v2.7.4
   Compiling strsim v0.11.1
   Compiling ident_case v1.0.1
   Compiling autocfg v1.3.0
   Compiling fnv v1.0.7
   Compiling thiserror v1.0.63
   Compiling typenum v1.17.0
   Compiling base32 v0.4.0
   Compiling version_check v0.9.5
   Compiling semver v1.0.23
   Compiling escape-bytes v0.1.1
   Compiling libc v0.2.158
   Compiling either v1.13.0
   Compiling hashbrown v0.14.5
   Compiling num-traits v0.2.19
   Compiling equivalent v1.0.1
   Compiling generic-array v0.14.7
   Compiling prettyplease v0.2.22
   Compiling cfg-if v1.0.0
   Compiling base64 v0.13.1
   Compiling itertools v0.11.0
   Compiling static_assertions v1.1.0
   Compiling rustc_version v0.4.1
   Compiling ethnum v1.5.0
   Compiling quote v1.0.37
   Compiling indexmap v2.5.0
   Compiling syn v2.0.77
   Compiling cpufeatures v0.2.14
   Compiling num-integer v0.1.46
   Compiling wasmparser v0.116.1
   Compiling num-bigint v0.4.6
   Compiling crypto-common v0.1.6
   Compiling block-buffer v0.10.4
   Compiling digest v0.10.7
   Compiling sha2 v0.10.8
   Compiling darling_core v0.20.10
   Compiling serde_derive v1.0.210
   Compiling thiserror-impl v1.0.63
   Compiling num-derive v0.4.2
   Compiling bytes-lit v0.0.5
   Compiling darling_macro v0.20.10
   Compiling darling v0.20.10
   Compiling serde_with_macros v3.9.0
   Compiling serde_with v3.9.0
   Compiling hex v0.4.3
   Compiling crate-git-revision v0.0.6
   Compiling stellar-strkey v0.0.8
   Compiling stellar-xdr v21.2.0
   Compiling soroban-env-common v21.2.1
   Compiling soroban-sdk-macros v21.7.0
   Compiling soroban-spec v21.7.0
   Compiling soroban-spec-rust v21.7.0
   Compiling soroban-env-macros v21.2.1
   Compiling soroban-env-guest v21.2.1
   Compiling soroban-sdk v21.7.0
   Compiling foo v0.0.0 (/Users/fnando/Projects/stellar/hello/contracts/foo)
    Finished `release` profile [optimized] target(s) in 15.23s
ℹ️ Build Summary:
  Wasm File: target/wasm32v1-none/release/foo.wasm
  Wasm Hash: 760dae254be0d102b10cbe4b2ff38b08b83bd8765c5f8cdc2fedde3d2debbac6
  Exported Functions: 2 found
    • _
    • hello
✅ Build Complete
ℹ️ CARGO_BUILD_RUSTFLAGS=--remap-path-prefix=/Users/fnando/.cargo/registry/src= cargo rustc --manifest-path=contracts/hello_world/Cargo.toml --crate-type=cdylib --target=wasm32v1-none --release
   Compiling hello-world v0.0.0 (/Users/fnando/Projects/stellar/hello/contracts/hello_world)
    Finished `release` profile [optimized] target(s) in 0.16s
ℹ️ Build Summary:
  Wasm File: target/wasm32v1-none/release/hello_world.wasm
  Wasm Hash: 760dae254be0d102b10cbe4b2ff38b08b83bd8765c5f8cdc2fedde3d2debbac6
  Exported Functions: 2 found
    • _
    • hello
✅ Build Complete
ℹ️ CARGO_BUILD_RUSTFLAGS=--remap-path-prefix=/Users/fnando/.cargo/registry/src= cargo rustc --manifest-path=contracts/test/Cargo.toml --crate-type=cdylib --target=wasm32v1-none --release
   Compiling test v0.0.0 (/Users/fnando/Projects/stellar/hello/contracts/test)
    Finished `release` profile [optimized] target(s) in 0.16s
ℹ️ Build Summary:
  Wasm File: target/wasm32v1-none/release/test.wasm
  Wasm Hash: 760dae254be0d102b10cbe4b2ff38b08b83bd8765c5f8cdc2fedde3d2debbac6
  Exported Functions: 2 found
    • _
    • hello
✅ Build Complete

Why

So users can build smart contracts independently of the rust version they're using.

Known limitations

N/A