Auto merge of rust-lang#118836 - matthiaskrgr:rollup-0chcgi1, r=matthiaskrgr

Rollup of 6 pull requests

Successful merges:

 - rust-lang#118647 (dump bootstrap shims)
 - rust-lang#118708 (tests: add sanity-check assembly test for every target)
 - rust-lang#118818 (llvm-wrapper: adapt for LLVM API change)
 - rust-lang#118826 (Edit target doc template to remove email)
 - rust-lang#118827 (Update table for linker-plugin-lto docs)
 - rust-lang#118835 (Fix again `rustc_codegen_gcc` tests)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

compiler/rustc_codegen_gcc/example/mini_core.rs

@@ -4,7 +4,7 @@
     thread_local
 )]
 #![no_core]
-#![allow(dead_code, internal_features)]
+#![allow(dead_code, internal_features, ambiguous_wide_pointer_comparisons)]
 
 #[no_mangle]
 unsafe extern "C" fn _Unwind_Resume() {

compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp

@@ -841,7 +841,11 @@ LLVMRustOptimize(
         // cargo run tests in multhreading mode by default
         // so use atomics for coverage counters
         Options.Atomic = true;
+#if LLVM_VERSION_GE(18, 0)
+        MPM.addPass(InstrProfilingLoweringPass(Options, false));
+#else
         MPM.addPass(InstrProfiling(Options, false));
+#endif
       }
     );
   }

src/bootstrap/src/bin/main.rs

@@ -10,8 +10,9 @@ use std::io::Write;
 #[cfg(all(any(unix, windows), not(target_os = "solaris")))]
 use std::process;
 use std::{
-    env, fs,
-    io::{self, IsTerminal},
+    env,
+    fs::{self, OpenOptions},
+    io::{self, BufRead, BufReader, IsTerminal},
 };
 
 use bootstrap::{
@@ -79,6 +80,9 @@ fn main() {
     }
 
     let pre_commit = config.src.join(".git").join("hooks").join("pre-commit");
+    let dump_bootstrap_shims = config.dump_bootstrap_shims;
+    let out_dir = config.out.clone();
+
     Build::new(config).build();
 
     if suggest_setup {
@@ -107,6 +111,29 @@ fn main() {
     if suggest_setup || changelog_suggestion.is_some() {
         println!("NOTE: this message was printed twice to make it more likely to be seen");
     }
+
+    if dump_bootstrap_shims {
+        let dump_dir = out_dir.join("bootstrap-shims-dump");
+        assert!(dump_dir.exists());
+
+        for entry in walkdir::WalkDir::new(&dump_dir) {
+            let entry = t!(entry);
+
+            if !entry.file_type().is_file() {
+                continue;
+            }
+
+            let file = t!(fs::File::open(&entry.path()));
+
+            // To ensure deterministic results we must sort the dump lines.
+            // This is necessary because the order of rustc invocations different
+            // almost all the time.
+            let mut lines: Vec<String> = t!(BufReader::new(&file).lines().collect());
+            lines.sort_by_key(|t| t.to_lowercase());
+            let mut file = t!(OpenOptions::new().write(true).truncate(true).open(&entry.path()));
+            t!(file.write_all(lines.join("\n").as_bytes()));
+        }
+    }
 }
 
 fn check_version(config: &Config) -> Option<String> {

src/bootstrap/src/bin/rustc.rs

@@ -32,9 +32,7 @@ fn main() {
     let args = env::args_os().skip(1).collect::<Vec<_>>();
     let arg = |name| args.windows(2).find(|args| args[0] == name).and_then(|args| args[1].to_str());
 
-    // We don't use the stage in this shim, but let's parse it to make sure that we're invoked
-    // by bootstrap, or that we provide a helpful error message if not.
-    bin_helpers::parse_rustc_stage();
+    let stage = bin_helpers::parse_rustc_stage();
     let verbose = bin_helpers::parse_rustc_verbose();
 
     // Detect whether or not we're a build script depending on whether --target
@@ -214,6 +212,8 @@ fn main() {
         }
     }
 
+    bin_helpers::maybe_dump(format!("stage{stage}-rustc"), &cmd);
+
     let start = Instant::now();
     let (child, status) = {
         let errmsg = format!("\nFailed to run:\n{cmd:?}\n-------------");

src/bootstrap/src/bin/rustdoc.rs

@@ -62,6 +62,8 @@ fn main() {
     cmd.arg("-Zunstable-options");
     cmd.arg("--check-cfg=cfg(bootstrap)");
 
+    bin_helpers::maybe_dump(format!("stage{stage}-rustdoc"), &cmd);
+
     if verbose > 1 {
         eprintln!(
             "rustdoc command: {:?}={:?} {:?}",

src/bootstrap/src/core/build_steps/clean.rs

@@ -146,6 +146,7 @@ fn clean_default(build: &Build) {
     rm_rf(&build.out.join("tmp"));
     rm_rf(&build.out.join("dist"));
     rm_rf(&build.out.join("bootstrap").join(".last-warned-change-id"));
+    rm_rf(&build.out.join("bootstrap-shims-dump"));
     rm_rf(&build.out.join("rustfmt.stamp"));
 
     for host in &build.hosts {

src/bootstrap/src/core/builder.rs

@@ -18,12 +18,12 @@ use crate::core::build_steps::tool::{self, SourceType};
 use crate::core::build_steps::{check, clean, compile, dist, doc, install, run, setup, test};
 use crate::core::config::flags::{Color, Subcommand};
 use crate::core::config::{DryRun, SplitDebuginfo, TargetSelection};
+use crate::prepare_behaviour_dump_dir;
 use crate::utils::cache::{Cache, Interned, INTERNER};
 use crate::utils::helpers::{self, add_dylib_path, add_link_lib_path, exe, linker_args};
 use crate::utils::helpers::{libdir, linker_flags, output, t, LldThreads};
-use crate::Crate;
 use crate::EXTRA_CHECK_CFGS;
-use crate::{Build, CLang, DocTests, GitRepo, Mode};
+use crate::{Build, CLang, Crate, DocTests, GitRepo, Mode};
 
 pub use crate::Compiler;
 
@@ -1788,6 +1788,16 @@ impl<'a> Builder<'a> {
 
         // Enable usage of unstable features
         cargo.env("RUSTC_BOOTSTRAP", "1");
+
+        if self.config.dump_bootstrap_shims {
+            prepare_behaviour_dump_dir(&self.build);
+
+            cargo
+                .env("DUMP_BOOTSTRAP_SHIMS", self.build.out.join("bootstrap-shims-dump"))
+                .env("BUILD_OUT", &self.build.out)
+                .env("CARGO_HOME", t!(home::cargo_home()));
+        };
+
         self.add_rust_test_threads(&mut cargo);
 
         // Almost all of the crates that we compile as part of the bootstrap may

src/bootstrap/src/core/config/config.rs

@@ -193,6 +193,7 @@ pub struct Config {
     pub cmd: Subcommand,
     pub incremental: bool,
     pub dry_run: DryRun,
+    pub dump_bootstrap_shims: bool,
     /// Arguments appearing after `--` to be forwarded to tools,
     /// e.g. `--fix-broken` or test arguments.
     pub free_args: Vec<String>,
@@ -1210,6 +1211,7 @@ impl Config {
         config.cmd = flags.cmd;
         config.incremental = flags.incremental;
         config.dry_run = if flags.dry_run { DryRun::UserSelected } else { DryRun::Disabled };
+        config.dump_bootstrap_shims = flags.dump_bootstrap_shims;
         config.keep_stage = flags.keep_stage;
         config.keep_stage_std = flags.keep_stage_std;
         config.color = flags.color;

src/bootstrap/src/core/config/flags.rs

@@ -85,6 +85,9 @@ pub struct Flags {
     #[arg(global(true), long)]
     /// dry run; don't build anything
     pub dry_run: bool,
+    /// Indicates whether to dump the work done from bootstrap shims
+    #[arg(global(true), long)]
+    pub dump_bootstrap_shims: bool,
     #[arg(global(true), value_hint = clap::ValueHint::Other, long, value_name = "N")]
     /// stage to build (indicates compiler to use/test, e.g., stage 0 uses the
     /// bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)

src/bootstrap/src/lib.rs

@@ -1871,3 +1871,22 @@ pub fn generate_smart_stamp_hash(dir: &Path, additional_input: &str) -> String {
 
     hex::encode(hasher.finalize().as_slice())
 }
+
+/// Ensures that the behavior dump directory is properly initialized.
+pub fn prepare_behaviour_dump_dir(build: &Build) {
+    static INITIALIZED: OnceLock<bool> = OnceLock::new();
+
+    let dump_path = build.out.join("bootstrap-shims-dump");
+
+    let initialized = INITIALIZED.get().unwrap_or_else(|| &false);
+    if !initialized {
+        // clear old dumps
+        if dump_path.exists() {
+            t!(fs::remove_dir_all(&dump_path));
+        }
+
+        t!(fs::create_dir_all(&dump_path));
+
+        t!(INITIALIZED.set(true));
+    }
+}