chore: add vendor dependencies for kauma build

vendor/anyhow/build.rs

@@ -0,0 +1,192 @@
+use std::env;
+use std::ffi::OsString;
+use std::iter;
+use std::path::Path;
+use std::process::{self, Command, Stdio};
+use std::str;
+
+#[cfg(all(feature = "backtrace", not(feature = "std")))]
+compile_error! {
+    "`backtrace` feature without `std` feature is not supported"
+}
+
+fn main() {
+    let mut error_generic_member_access = false;
+    if cfg!(feature = "std") {
+        println!("cargo:rerun-if-changed=build/probe.rs");
+
+        let consider_rustc_bootstrap;
+        if compile_probe(false) {
+            // This is a nightly or dev compiler, so it supports unstable
+            // features regardless of RUSTC_BOOTSTRAP. No need to rerun build
+            // script if RUSTC_BOOTSTRAP is changed.
+            error_generic_member_access = true;
+            consider_rustc_bootstrap = false;
+        } else if let Some(rustc_bootstrap) = env::var_os("RUSTC_BOOTSTRAP") {
+            if compile_probe(true) {
+                // This is a stable or beta compiler for which the user has set
+                // RUSTC_BOOTSTRAP to turn on unstable features. Rerun build
+                // script if they change it.
+                error_generic_member_access = true;
+                consider_rustc_bootstrap = true;
+            } else if rustc_bootstrap == "1" {
+                // This compiler does not support the generic member access API
+                // in the form that anyhow expects. No need to pay attention to
+                // RUSTC_BOOTSTRAP.
+                error_generic_member_access = false;
+                consider_rustc_bootstrap = false;
+            } else {
+                // This is a stable or beta compiler for which RUSTC_BOOTSTRAP
+                // is set to restrict the use of unstable features by this
+                // crate.
+                error_generic_member_access = false;
+                consider_rustc_bootstrap = true;
+            }
+        } else {
+            // Without RUSTC_BOOTSTRAP, this compiler does not support the
+            // generic member access API in the form that anyhow expects, but
+            // try again if the user turns on unstable features.
+            error_generic_member_access = false;
+            consider_rustc_bootstrap = true;
+        }
+
+        if error_generic_member_access {
+            println!("cargo:rustc-cfg=std_backtrace");
+            println!("cargo:rustc-cfg=error_generic_member_access");
+        }
+
+        if consider_rustc_bootstrap {
+            println!("cargo:rerun-if-env-changed=RUSTC_BOOTSTRAP");
+        }
+    }
+
+    let rustc = match rustc_minor_version() {
+        Some(rustc) => rustc,
+        None => return,
+    };
+
+    if rustc >= 80 {
+        println!("cargo:rustc-check-cfg=cfg(anyhow_nightly_testing)");
+        println!("cargo:rustc-check-cfg=cfg(anyhow_no_core_error)");
+        println!("cargo:rustc-check-cfg=cfg(anyhow_no_core_unwind_safe)");
+        println!("cargo:rustc-check-cfg=cfg(anyhow_no_fmt_arguments_as_str)");
+        println!("cargo:rustc-check-cfg=cfg(anyhow_no_ptr_addr_of)");
+        println!("cargo:rustc-check-cfg=cfg(anyhow_no_unsafe_op_in_unsafe_fn_lint)");
+        println!("cargo:rustc-check-cfg=cfg(error_generic_member_access)");
+        println!("cargo:rustc-check-cfg=cfg(std_backtrace)");
+    }
+
+    if rustc < 51 {
+        // core::ptr::addr_of
+        // https://blog.rust-lang.org/2021/03/25/Rust-1.51.0.html#stabilized-apis
+        println!("cargo:rustc-cfg=anyhow_no_ptr_addr_of");
+    }
+
+    if rustc < 52 {
+        // core::fmt::Arguments::as_str
+        // https://blog.rust-lang.org/2021/05/06/Rust-1.52.0.html#stabilized-apis
+        println!("cargo:rustc-cfg=anyhow_no_fmt_arguments_as_str");
+
+        // #![deny(unsafe_op_in_unsafe_fn)]
+        // https://github.com/rust-lang/rust/issues/71668
+        println!("cargo:rustc-cfg=anyhow_no_unsafe_op_in_unsafe_fn_lint");
+    }
+
+    if rustc < 56 {
+        // core::panic::{UnwindSafe, RefUnwindSafe}
+        // https://blog.rust-lang.org/2021/10/21/Rust-1.56.0.html#stabilized-apis
+        println!("cargo:rustc-cfg=anyhow_no_core_unwind_safe");
+    }
+
+    if !error_generic_member_access && cfg!(feature = "std") && rustc >= 65 {
+        // std::backtrace::Backtrace
+        // https://blog.rust-lang.org/2022/11/03/Rust-1.65.0.html#stabilized-apis
+        println!("cargo:rustc-cfg=std_backtrace");
+    }
+
+    if rustc < 81 {
+        // core::error::Error
+        // https://blog.rust-lang.org/2024/09/05/Rust-1.81.0.html#coreerrorerror
+        println!("cargo:rustc-cfg=anyhow_no_core_error");
+    }
+}
+
+fn compile_probe(rustc_bootstrap: bool) -> bool {
+    if env::var_os("RUSTC_STAGE").is_some() {
+        // We are running inside rustc bootstrap. This is a highly non-standard
+        // environment with issues such as:
+        //
+        //     https://github.com/rust-lang/cargo/issues/11138
+        //     https://github.com/rust-lang/rust/issues/114839
+        //
+        // Let's just not use nightly features here.
+        return false;
+    }
+
+    let rustc = cargo_env_var("RUSTC");
+    let out_dir = cargo_env_var("OUT_DIR");
+    let probefile = Path::new("build").join("probe.rs");
+
+    let rustc_wrapper = env::var_os("RUSTC_WRAPPER").filter(|wrapper| !wrapper.is_empty());
+    let rustc_workspace_wrapper =
+        env::var_os("RUSTC_WORKSPACE_WRAPPER").filter(|wrapper| !wrapper.is_empty());
+    let mut rustc = rustc_wrapper
+        .into_iter()
+        .chain(rustc_workspace_wrapper)
+        .chain(iter::once(rustc));
+    let mut cmd = Command::new(rustc.next().unwrap());
+    cmd.args(rustc);
+
+    if !rustc_bootstrap {
+        cmd.env_remove("RUSTC_BOOTSTRAP");
+    }
+
+    cmd.stderr(Stdio::null())
+        .arg("--edition=2018")
+        .arg("--crate-name=anyhow")
+        .arg("--crate-type=lib")
+        .arg("--emit=dep-info,metadata")
+        .arg("--cap-lints=allow")
+        .arg("--out-dir")
+        .arg(out_dir)
+        .arg(probefile);
+
+    if let Some(target) = env::var_os("TARGET") {
+        cmd.arg("--target").arg(target);
+    }
+
+    // If Cargo wants to set RUSTFLAGS, use that.
+    if let Ok(rustflags) = env::var("CARGO_ENCODED_RUSTFLAGS") {
+        if !rustflags.is_empty() {
+            for arg in rustflags.split('\x1f') {
+                cmd.arg(arg);
+            }
+        }
+    }
+
+    match cmd.status() {
+        Ok(status) => status.success(),
+        Err(_) => false,
+    }
+}
+
+fn rustc_minor_version() -> Option<u32> {
+    let rustc = cargo_env_var("RUSTC");
+    let output = Command::new(rustc).arg("--version").output().ok()?;
+    let version = str::from_utf8(&output.stdout).ok()?;
+    let mut pieces = version.split('.');
+    if pieces.next() != Some("rustc 1") {
+        return None;
+    }
+    pieces.next()?.parse().ok()
+}
+
+fn cargo_env_var(key: &str) -> OsString {
+    env::var_os(key).unwrap_or_else(|| {
+        eprintln!(
+            "Environment variable ${} is not set during execution of build script",
+            key,
+        );
+        process::exit(1);
+    })
+}