Remove blob build/check from xtask crate.

Author: wt

cortex-m/asm-toolchain

@@ -4,124 +4,7 @@
 //!
 //! Also see the docs in `asm.rs`.
 
-use std::collections::BTreeMap;
-use std::env::current_dir;
-use std::fs::{self, File};
-use std::path::Path;
-use std::process::{Command, Stdio};
-
-fn toolchain() -> String {
-    fs::read_to_string("cortex-m/asm-toolchain")
-        .unwrap()
-        .trim()
-        .to_string()
-}
-
-fn rustc() -> Command {
-    let mut cmd = Command::new("rustc");
-    cmd.arg(format!("+{}", toolchain()));
-    cmd.arg("--edition=2024");
-    cmd
-}
-
-fn assemble_really(target: &str, cfgs: &[&str], plugin_lto: bool) {
-    let mut cmd = rustc();
-
-    // Set the codegen target.
-    cmd.arg("--target").arg(target);
-    // Set all the `--cfg` directives for the target.
-    cmd.args(cfgs.iter().map(|cfg| format!("--cfg={}", cfg)));
-
-    // We want some level of debuginfo to allow unwinding through the functions.
-    cmd.arg("-g");
-    // We always optimize the assembly shims. There's not really any reason not to.
-    cmd.arg("-O");
-
-    // We use LTO on the archive to ensure the (unused) panic handler is removed, preventing
-    // a linker error when the archives are linked into final crates with two panic handlers.
-    cmd.arg("-Clto=yes");
-
-    // rustc will usually add frame pointers by default to aid with debugging, but that is a high
-    // overhead for the tiny assembly routines.
-    cmd.arg("-Cforce-frame-pointers=no");
-
-    // We don't want any system-specific paths to show up since we ship the result to other users.
-    // Add `--remap-path-prefix $(pwd)=.`.
-    let mut dir = current_dir()
-        .unwrap()
-        .join("cortex-m")
-        .as_os_str()
-        .to_os_string();
-    dir.push("=.");
-    cmd.arg("--remap-path-prefix").arg(dir);
-
-    // We let rustc build a single object file, not a staticlib, since the latter pulls in loads of
-    // code that will never be used (`compiler_builtins` and `core::fmt`, etc.). We build the static
-    // archive by hand after compiling.
-    cmd.arg("--emit=obj");
-
-    if plugin_lto {
-        // Make artifacts compatible with Linker-Plugin LTO (and incompatible with everything else).
-        cmd.arg("-Clinker-plugin-lto");
-    }
-
-    let file_stub = if plugin_lto {
-        format!("{}-lto", target)
-    } else {
-        target.to_string()
-    };
-
-    let obj_file = format!("bin/{}.o", file_stub);
-
-    // Pass output and input file.
-    cmd.arg("-o").arg(&obj_file);
-    cmd.arg("asm/lib.rs");
-    cmd.current_dir("cortex-m");
-
-    println!("{:?}", cmd);
-    let status = cmd.status().unwrap();
-    assert!(status.success());
-
-    let full_obj_file_path = Path::new("cortex-m").join(&obj_file);
-
-    // Archive `target.o` -> `bin/target.a`.
-    let mut builder =
-        ar::Builder::new(File::create(format!("cortex-m/bin/{}.a", file_stub)).unwrap());
-
-    // Use `append`, not `append_path`, to avoid adding any filesystem metadata (modification times,
-    // etc.).
-    let file = fs::read(&full_obj_file_path).unwrap();
-    builder
-        .append(
-            &ar::Header::new(obj_file.as_bytes().to_vec(), file.len() as u64),
-            &*file,
-        )
-        .unwrap();
-
-    fs::remove_file(&full_obj_file_path).unwrap();
-}
-
-fn assemble(target: &str, cfgs: &[&str]) {
-    assemble_really(target, cfgs, false);
-    assemble_really(target, cfgs, true);
-}
-
-// `--target` -> `--cfg` list (mirrors what `build.rs` does).
-static TARGETS: &[(&str, &[&str])] = &[
-    ("thumbv6m-none-eabi", &[]),
-    ("thumbv7m-none-eabi", &["armv7m"]),
-    ("thumbv7em-none-eabi", &["armv7m", "armv7em"]),
-    ("thumbv7em-none-eabihf", &["armv7m", "armv7em", "has_fpu"]),
-    ("thumbv8m.base-none-eabi", &["armv8m", "armv8m_base"]),
-    (
-        "thumbv8m.main-none-eabi",
-        &["armv7m", "armv8m", "armv8m_main"],
-    ),
-    (
-        "thumbv8m.main-none-eabihf",
-        &["armv7m", "armv8m", "armv8m_main", "has_fpu"],
-    ),
-];
+use std::process::Command;
 
 pub fn install_targets(targets: &mut dyn Iterator<Item = &str>, toolchain: Option<&str>) {
     let mut rustup = Command::new("rustup");
@@ -135,90 +18,6 @@ pub fn install_targets(targets: &mut dyn Iterator<Item = &str>, toolchain: Optio
     assert!(status.success(), "rustup command failed: {:?}", rustup);
 }
 
-pub fn assemble_blobs() {
-    let mut cmd = rustc();
-    cmd.arg("-V");
-    cmd.stdout(Stdio::null());
-    let status = cmd.status().unwrap();
-    let toolchain = toolchain();
-
-    if !status.success() {
-        println!(
-            "asm toolchain {} does not seem to be installed. installing it now.",
-            toolchain
-        );
-
-        let mut rustup = Command::new("rustup");
-        let status = rustup.arg("install").arg(&toolchain).status().unwrap();
-        assert!(status.success(), "rustup command failed: {:?}", rustup);
-    }
-
-    install_targets(
-        &mut TARGETS.iter().map(|(target, _)| *target),
-        Some(&*toolchain),
-    );
-
-    for (target, cfgs) in TARGETS {
-        println!("building artifacts for {}", target);
-        assemble(target, cfgs);
-    }
-}
-
-pub fn check_blobs() {
-    // Load each `.a` file in `bin` into memory.
-    let mut files_before = BTreeMap::new();
-    for entry in fs::read_dir("cortex-m/bin").unwrap() {
-        let entry = entry.unwrap();
-        if entry.path().extension().unwrap() == "a" {
-            files_before.insert(
-                entry
-                    .path()
-                    .file_name()
-                    .unwrap()
-                    .to_str()
-                    .unwrap()
-                    .to_string(),
-                fs::read(entry.path()).unwrap(),
-            );
-        }
-    }
-
-    assemble_blobs();
-
-    let mut files_after = BTreeMap::new();
-    for entry in fs::read_dir("cortex-m/bin").unwrap() {
-        let entry = entry.unwrap();
-        if entry.path().extension().unwrap() == "a" {
-            files_after.insert(
-                entry
-                    .path()
-                    .file_name()
-                    .unwrap()
-                    .to_str()
-                    .unwrap()
-                    .to_string(),
-                fs::read(entry.path()).unwrap(),
-            );
-        }
-    }
-
-    // Ensure they contain the same files.
-    let before = files_before.keys().collect::<Vec<_>>();
-    let after = files_after.keys().collect::<Vec<_>>();
-    assert_eq!(before, after);
-
-    for ((file, before), (_, after)) in files_before.iter().zip(files_after.iter()) {
-        if before != after {
-            panic!(
-                "{} is not up-to-date, please run `cargo xtask assemble`",
-                file
-            );
-        }
-    }
-
-    println!("Blobs identical.");
-}
-
 // Check that serde and PartialOrd works with VectActive
 pub fn check_host_side() {
     use cortex_m::peripheral::scb::VectActive;

xtask/src/lib.rs

@@ -1,20 +1,14 @@
 use std::{env, process};
-use xtask::{assemble_blobs, check_blobs, check_host_side};
+use xtask::check_host_side;
 
 fn main() {
     let subcommand = env::args().nth(1);
     match subcommand.as_deref() {
-        Some("assemble") => assemble_blobs(),
-        Some("check-blobs") => check_blobs(),
         Some("check-host-side") => check_host_side(),
         _ => {
             eprintln!("usage: cargo xtask <subcommand>");
             eprintln!();
             eprintln!("subcommands:");
-            eprintln!("    assemble         Reassemble the pre-built artifacts");
-            eprintln!(
-                "    check-blobs      Check that the pre-built artifacts are up-to-date and reproducible"
-            );
             eprintln!(
                 "    check-host-side  Build the crate in a non-Cortex-M host application and check host side usage of certain types"
             );

xtask/src/main.rs

@@ -1,6 +1,6 @@
 use std::process::Command;
 use std::{env, str};
-use xtask::{check_blobs, check_host_side, install_targets};
+use xtask::{check_host_side, install_targets};
 
 /// List of all compilation targets we support.
 ///
@@ -98,9 +98,6 @@ fn main() {
 
     install_targets(&mut ALL_TARGETS.iter().cloned(), None);
 
-    // Check that the ASM blobs are up-to-date.
-    check_blobs();
-
     let output = Command::new("rustc").arg("-V").output().unwrap();
     let is_nightly = str::from_utf8(&output.stdout).unwrap().contains("nightly");
     let is_msrv = str::from_utf8(&output.stdout).unwrap().contains("1.59");