wasmerio/wasmer · error

failed to create v8 cache dir {}: {err}

Error message

failed to create v8 cache dir {}: {err}

What it means

Error "failed to create v8 cache dir {}: {err}" thrown in wasmerio/wasmer.

Source

Thrown at lib/api/build.rs:46

    let out_path = PathBuf::from(&out_dir);
    let crate_root = env::var("CARGO_MANIFEST_DIR").unwrap();
    let v8_header_path = PathBuf::from(&crate_root).join("third-party").join("wee8");
    let cache_dir = out_path
        .join("../../../../")
        .join("wee8-artifacts")
        .join(WEE8_RELEASE_VERSION)
        .join(platform_name);
    let archive_path = cache_dir.join(asset_name);
    let v8_lib_dir = cache_dir.join("lib");
    let v8_lib_path = v8_lib_dir.join(if cfg!(target_os = "windows") {
        "v8.lib"
    } else {
        "libv8.a"
    });

    if !v8_lib_path.exists() {
        fs::create_dir_all(&cache_dir).unwrap_or_else(|err| {
            panic!(
                "failed to create v8 cache dir {}: {err}",
                cache_dir.display()
            )
        });

        if v8_lib_dir.exists() && !v8_lib_path.exists() {
            fs::remove_dir_all(&v8_lib_dir).unwrap_or_else(|err| {
                panic!(
                    "failed to remove incomplete wee8 lib dir {}: {err}",
                    v8_lib_dir.display()
                )
            });
        }

        if !archive_path.exists() {
            use std::io::Write;

            let url = format!(

View on GitHub (pinned to 8c4b9ee9d3)

When it happens

Trigger: Thrown at lib/api/build.rs:46 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of wasmerio/wasmer@8c4b9ee9d3 (2026-09-01). Data as JSON: /api/errors/3aad823155e2f1b3. Report an issue: GitHub.