Update the cc crate for rustc_llvm

Cargo.lock

@@ -544,10 +544,11 @@ version = "0.1.0"
 
 [[package]]
 name = "cc"
-version = "1.2.16"
+version = "1.2.50"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "be714c154be609ec7f5dad223a33bf1482fff90472de28f7362806e6d4832b8c"
+checksum = "9f50d563227a1c37cc0a263f64eca3334388c01c5e4c4861a9def205c614383c"
 dependencies = [
+ "find-msvc-tools",
  "jobserver",
  "libc",
  "shlex",

compiler/rustc_llvm/Cargo.toml

@@ -11,7 +11,7 @@ libc = "0.2.73"
 [build-dependencies]
 # tidy-alphabetical-start
 # `cc` updates often break things, so we pin it here.
-cc = "=1.2.16"
+cc = "=1.2.50"
 shlex = "1.3.0"
 # tidy-alphabetical-end
 

src/bootstrap/src/core/build_steps/compile.rs

@@ -1907,7 +1907,7 @@ pub fn compiler_file(
         return PathBuf::new();
     }
     let mut cmd = command(compiler);
-    cmd.args(builder.cc_handled_clags(target, c));
+    cmd.args(builder.cc_handled_cflags(target, c));
     cmd.args(builder.cc_unhandled_cflags(target, GitRepo::Rustc, c));
     cmd.arg(format!("-print-file-name={file}"));
     let out = cmd.run_capture_stdout(builder).stdout();

src/bootstrap/src/core/build_steps/llvm.rs

@@ -800,7 +800,7 @@ fn configure_cmake(
     // Needs `suppressed_compiler_flag_prefixes` to be gone, and hence
     // https://github.com/llvm/llvm-project/issues/88780 to be fixed.
     for flag in builder
-        .cc_handled_clags(target, CLang::C)
+        .cc_handled_cflags(target, CLang::C)
         .into_iter()
         .chain(builder.cc_unhandled_cflags(target, GitRepo::Llvm, CLang::C))
         .filter(|flag| !suppressed_compiler_flag_prefixes.iter().any(|p| flag.starts_with(p)))
@@ -821,7 +821,7 @@ fn configure_cmake(
     cfg.define("CMAKE_C_FLAGS", cflags);
     let mut cxxflags = ccflags.cxxflags.clone();
     for flag in builder
-        .cc_handled_clags(target, CLang::Cxx)
+        .cc_handled_cflags(target, CLang::Cxx)
         .into_iter()
         .chain(builder.cc_unhandled_cflags(target, GitRepo::Llvm, CLang::Cxx))
         .filter(|flag| {

src/bootstrap/src/core/build_steps/test.rs

@@ -2428,9 +2428,9 @@ Please disable assertions with `rust.debug-assertions = false`.
         // Only pass correct values for these flags for the `run-make` suite as it
         // requires that a C++ compiler was configured which isn't always the case.
         if !builder.config.dry_run() && mode == CompiletestMode::RunMake {
-            let mut cflags = builder.cc_handled_clags(target, CLang::C);
+            let mut cflags = builder.cc_handled_cflags(target, CLang::C);
             cflags.extend(builder.cc_unhandled_cflags(target, GitRepo::Rustc, CLang::C));
-            let mut cxxflags = builder.cc_handled_clags(target, CLang::Cxx);
+            let mut cxxflags = builder.cc_handled_cflags(target, CLang::Cxx);
             cxxflags.extend(builder.cc_unhandled_cflags(target, GitRepo::Rustc, CLang::Cxx));
             cmd.arg("--cc")
                 .arg(builder.cc(target))

src/bootstrap/src/lib.rs

@@ -1276,7 +1276,7 @@ impl Build {
 
     /// Returns C flags that `cc-rs` thinks should be enabled for the
     /// specified target by default.
-    fn cc_handled_clags(&self, target: TargetSelection, c: CLang) -> Vec<String> {
+    fn cc_handled_cflags(&self, target: TargetSelection, c: CLang) -> Vec<String> {
         if self.config.dry_run() {
             return Vec::new();
         }

src/bootstrap/src/utils/cc_detect.rs

@@ -25,7 +25,7 @@ use std::collections::HashSet;
 use std::iter;
 use std::path::{Path, PathBuf};
 
-use crate::core::config::TargetSelection;
+use crate::core::config::{RustcLto, TargetSelection};
 use crate::utils::exec::{BootstrapCommand, command};
 use crate::{Build, CLang, GitRepo};
 
@@ -53,6 +53,15 @@ fn new_cc_build(build: &Build, target: TargetSelection) -> cc::Build {
             }
         }
     }
+    match build.config.rust_lto {
+        RustcLto::Off | RustcLto::ThinLocal => {}
+        RustcLto::Thin => {
+            cfg.flag_if_supported("-flto=thin");
+        }
+        RustcLto::Fat => {
+            cfg.flag_if_supported("-flto=full");
+        }
+    }
     cfg
 }
 
@@ -113,7 +122,7 @@ pub fn fill_target_compiler(build: &mut Build, target: TargetSelection) {
     };
 
     build.cc.insert(target, compiler.clone());
-    let mut cflags = build.cc_handled_clags(target, CLang::C);
+    let mut cflags = build.cc_handled_cflags(target, CLang::C);
     cflags.extend(build.cc_unhandled_cflags(target, GitRepo::Rustc, CLang::C));
 
     // If we use llvm-libunwind, we will need a C++ compiler as well for all targets
@@ -140,7 +149,7 @@ pub fn fill_target_compiler(build: &mut Build, target: TargetSelection) {
     build.do_if_verbose(|| println!("CC_{} = {:?}", target.triple, build.cc(target)));
     build.do_if_verbose(|| println!("CFLAGS_{} = {cflags:?}", target.triple));
     if let Ok(cxx) = build.cxx(target) {
-        let mut cxxflags = build.cc_handled_clags(target, CLang::Cxx);
+        let mut cxxflags = build.cc_handled_cflags(target, CLang::Cxx);
         cxxflags.extend(build.cc_unhandled_cflags(target, GitRepo::Rustc, CLang::Cxx));
         build.do_if_verbose(|| println!("CXX_{} = {cxx:?}", target.triple));
         build.do_if_verbose(|| println!("CXXFLAGS_{} = {cxxflags:?}", target.triple));