Fresh clone build/test failures: missing `libcrypto_wrappers.a` and log tests fail

[vladfdp]

The following is slop ⚠️:

Summary

After cloning the repo without modifications, zig build and zig build test-unit fail. Two issues appear:

1. zig build fails because lib/voltaire/target/release/libcrypto_wrappers.a is missing.
2. zig build test-unit fails because the log tests emit err output, which the test runner treats as an error.

Both failures occur on a clean checkout.

Environment

• OS: macOS (darwin 25.2.0)
• Zig: 0.15.1
• Shell: zsh

Repro Steps

1. git clone <repo>
2. zig build
3. zig build test-unit

Observed Errors

1) Missing crypto wrappers library

error: /Users/.../lib/voltaire/target/release/libcrypto_wrappers.a: file not found

The build invokes cargo in lib/voltaire, but the output ends up in the workspace root target/ rather than lib/voltaire/target/, so Zig’s expected path doesn’t exist.

2) Unit tests fail on logging

zig build test-unit shows:

error: 'log.test.log functions compile and execute without error' logged errors
[default] (err): [EVM2] test error message: error

The tests in src/log.zig call err(), and the test harness treats any error log as a test failure.

Proposed Fixes

A) Ensure cargo outputs to lib/voltaire/target/

In lib/voltaire/lib/build.zig, set CARGO_TARGET_DIR=target before invoking cargo so libcrypto_wrappers.a lands where Zig expects.

Suggested change:

cargo_build.setEnvironmentVariable("CARGO_TARGET_DIR", "target");

B) Avoid treating err() as test failure

In src/log.zig, route err() to std.log.warn when running tests (builtin.is_test) so the tests don’t fail on expected output.

Suggested approach:

• If builtin.is_test, call std.log.warn(...) instead of std.log.err(...).
• Keep normal behavior in non-test builds.

Notes

• Adding lib/voltaire to the workspace members also resolves a cargo workspace warning.
• If you prefer not to alter logging behavior in tests, another option is to update the log tests to avoid calling err().