chore: update openvm build nightly version (#2152)

For guest programs with MSRV 1.87+, it is convenient for `cargo openvm
build` to use a newer Rust toolchain. We chose `2025-08-02` since that
is when the last stable Rust 1.90.0 branched from master:
https://releases.rs/docs/1.90.0/

Note that users can always override the toolchain version with env var
`OPENVM_RUST_TOOLCHAIN`.

workflow run:
https://github.com/axiom-crypto/openvm-reth-benchmark/actions/runs/18085897389/job/51456939479

Author: jonathanpwang

.github/workflows/extension-tests.cuda.yml

@@ -122,7 +122,7 @@ jobs:
               # Run integration tests
               if [ -d "extensions/$ext/tests" ]; then
                 pushd extensions/$ext/tests
-                rustup component add rust-src --toolchain nightly-2025-02-14
+                rustup component add rust-src --toolchain nightly-2025-08-02
                 ${{ env.NEXTEST_ENV }} cargo nextest run ${{ env.FEATURE_ARGS }} --profile=heavy --no-tests=pass
                 popd
               fi

.github/workflows/extension-tests.yml

@@ -92,5 +92,5 @@ jobs:
         if: hashFiles(format('extensions/{0}/tests', matrix.extension.path)) != ''
         working-directory: extensions/${{ matrix.extension.path }}/tests
         run: |
-          rustup component add rust-src --toolchain nightly-2025-02-14
+          rustup component add rust-src --toolchain nightly-2025-08-02
           cargo nextest run --cargo-profile=fast --profile=heavy --no-tests=pass

.github/workflows/guest-lib-tests.cuda.yml

@@ -123,7 +123,7 @@ jobs:
           FILTER_OUTPUTS: ${{ toJSON(steps.filter.outputs) }}
         run: |
           COMMON_CHANGED=$(echo $FILTER_OUTPUTS | jq -r .common)
-          rustup component add rust-src --toolchain nightly-2025-02-14
+          rustup component add rust-src --toolchain nightly-2025-08-02
 
           for crate in ${{ matrix.crates.names }}; do
             crate_changed=$(echo $FILTER_OUTPUTS | jq -r .$crate)

.github/workflows/guest-lib-tests.yml

@@ -74,7 +74,7 @@ jobs:
       - name: Run ${{ matrix.crate.name }} guest library tests
         working-directory: guest-libs/${{ matrix.crate.path }}
         run: |
-          rustup component add rust-src --toolchain nightly-2025-02-14
+          rustup component add rust-src --toolchain nightly-2025-08-02
           PAIRING_FEATURE_ARGS=""
           if [[ "${{ matrix.crate.name }}" == "pairing" ]]; then
             PAIRING_FEATURE_ARGS="--features=bn254,bls12_381"

.github/workflows/riscv.yml

@@ -80,7 +80,7 @@ jobs:
       - name: Run RISC-V test vector tests
         working-directory: crates/toolchain/tests
         run: |
-          rustup component add rust-src --toolchain nightly-2025-02-14
+          rustup component add rust-src --toolchain nightly-2025-08-02
           if [[ ${{ matrix.platform.runner }} == *"gpu"* ]]; then
             TEST_NAME=test_rv32im_riscv_vector_prove
           else

CHANGELOG.md

@@ -5,9 +5,11 @@ All notable changes to OpenVM will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project follows a versioning principles documented in [VERSIONING.md](./VERSIONING.md).
 
-## Unreleased
+## v1.4.1 (Unreleased)
 
 ### Changed
+- (Toolchain) Update `cargo openvm build` to use Rust nightly version `nightly-2025-08-02`.
+- (Primitives Library) Fix in `openvm-algebra-complex-macros` to ensure `const` byte arrays have proper memory alignment.
 - (Executor) Modified `VirtualMachine::build_metered_ctx` to take the program (`&VmExe<Val<E::SC>>`) as an argument.
 
 ## v1.4.0 (2025-09-01)

ci/scripts/utils.sh

@@ -104,11 +104,11 @@ install_s5cmd() {
     arch=$(uname -m)
     case $arch in
     arm64|aarch64)
-        rustup component add rust-src --toolchain nightly-2025-02-14-aarch64-unknown-linux-gnu
+        rustup component add rust-src --toolchain nightly-2025-08-02-aarch64-unknown-linux-gnu
         S5CMD_BIN="s5cmd_2.2.2_linux_arm64.deb"
         ;;
     x86_64|amd64)
-        rustup component add rust-src --toolchain nightly-2025-02-14-x86_64-unknown-linux-gnu
+        rustup component add rust-src --toolchain nightly-2025-08-02-x86_64-unknown-linux-gnu
         S5CMD_BIN="s5cmd_2.2.2_linux_amd64.deb"
         ;;
     *)

crates/toolchain/build/src/lib.rs

@@ -22,7 +22,7 @@ mod config;
 /// The rustc compiler [target](https://doc.rust-lang.org/rustc/targets/index.html).
 pub const RUSTC_TARGET: &str = "riscv32im-risc0-zkvm-elf";
 /// The default Rust toolchain name to use if OPENVM_RUST_TOOLCHAIN is not set
-pub const DEFAULT_RUSTUP_TOOLCHAIN_NAME: &str = "nightly-2025-02-14";
+pub const DEFAULT_RUSTUP_TOOLCHAIN_NAME: &str = "nightly-2025-08-02";
 
 /// Get the Rust toolchain name from environment variable or default
 pub fn get_rustup_toolchain_name() -> String {

docs/vocs/docs/pages/book/getting-started/install.mdx

@@ -20,8 +20,8 @@ curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
 . "$HOME/.cargo/env"
 
 # install nightly Rust toolchain for binary builds
-rustup install nightly-2025-02-14
-rustup component add rust-src --toolchain nightly-2025-02-14
+rustup install nightly-2025-08-02
+rustup component add rust-src --toolchain nightly-2025-08-02
 
 # install build tools for Ubuntu
 sudo apt update
@@ -42,8 +42,8 @@ curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
 . "$HOME/.cargo/env"
 
 # install nightly Rust toolchain for binary builds
-rustup install nightly-2025-02-14
-rustup component add rust-src --toolchain nightly-2025-02-14
+rustup install nightly-2025-08-02
+rustup component add rust-src --toolchain nightly-2025-08-02
 
 # install build tools for macOS
 xcode-select --install

docs/vocs/docs/pages/specs/reference/rust-frontend.mdx

@@ -17,7 +17,7 @@ The OpenVM Rust frontend supports the following host and guest target and toolch
 
 - **Host**: We support `aarch64-apple-darwin` and `x86_64-unknown-linux-gnu` with Rust 1.86.0: `rustc 1.86.0 (05f9846f8 2025-03-31)`.
 For reproducible builds, we recommend using the `x86_64-unknown-linux-gnu` platform.
-- **Guest**: `riscv32im-risc0-zkvm-elf` with Rust `nightly-2025-02-14`: `rustc 1.86.0-nightly (a567209da 2025-02-13)`.
+- **Guest**: `riscv32im-risc0-zkvm-elf` with Rust `nightly-2025-08-02`: `rustc 1.90.0-nightly (4b55fe199 2025-08-01)`.
 
 The `riscv32im-risc0-zkvm-elf` guest target incorporates special support for
 zkVMs and has official support by the