Fix LLD thread flags in bootstrap on Windows

src/bootstrap/src/core/build_steps/dist.rs

@@ -1319,7 +1319,7 @@ impl Step for CodegenBackend {
                 return None;
             }
 
-            if self.compiler.host.contains("windows") {
+            if self.compiler.host.is_windows() {
                 builder.info(
                     "dist currently disabled for windows by rustc_codegen_cranelift. skipping",
                 );
@@ -1658,7 +1658,7 @@ impl Step for Extended {
             builder.run(&mut cmd);
         }
 
-        if target.contains("windows") {
+        if target.is_windows() {
             let exe = tmp.join("exe");
             let _ = fs::remove_dir_all(&exe);
 

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

@@ -283,7 +283,7 @@ impl Step for Llvm {
         };
 
         builder.update_submodule(&Path::new("src").join("llvm-project"));
-        if builder.llvm_link_shared() && target.contains("windows") {
+        if builder.llvm_link_shared() && target.is_windows() {
             panic!("shared linking to LLVM is not currently supported on {}", target.triple);
         }
 
@@ -361,7 +361,7 @@ impl Step for Llvm {
         // Disable zstd to avoid a dependency on libzstd.so.
         cfg.define("LLVM_ENABLE_ZSTD", "OFF");
 
-        if !target.contains("windows") {
+        if !target.is_windows() {
             cfg.define("LLVM_ENABLE_ZLIB", "ON");
         } else {
             cfg.define("LLVM_ENABLE_ZLIB", "OFF");
@@ -607,7 +607,7 @@ fn configure_cmake(
             cfg.define("CMAKE_SYSTEM_NAME", "DragonFly");
         } else if target.contains("freebsd") {
             cfg.define("CMAKE_SYSTEM_NAME", "FreeBSD");
-        } else if target.contains("windows") {
+        } else if target.is_windows() {
             cfg.define("CMAKE_SYSTEM_NAME", "Windows");
         } else if target.contains("haiku") {
             cfg.define("CMAKE_SYSTEM_NAME", "Haiku");
@@ -772,7 +772,7 @@ fn configure_cmake(
         && !target.contains("netbsd")
         && !target.contains("solaris")
     {
-        if target.contains("apple") || target.contains("windows") {
+        if target.contains("apple") || target.is_windows() {
             ldflags.push_all("-static-libstdc++");
         } else {
             ldflags.push_all("-Wl,-Bsymbolic -static-libstdc++");
@@ -1295,7 +1295,7 @@ impl Step for Libunwind {
                 cfg.define("__LIBUNWIND_IS_NATIVE_ONLY", None);
                 cfg.define("NDEBUG", None);
             }
-            if self.target.contains("windows") {
+            if self.target.is_windows() {
                 cfg.define("_LIBUNWIND_HIDE_SYMBOLS", "1");
                 cfg.define("_LIBUNWIND_IS_NATIVE_ONLY", "1");
             }

src/bootstrap/src/core/builder.rs

@@ -1653,10 +1653,7 @@ impl<'a> Builder<'a> {
                 // flesh out rpath support more fully in the future.
                 rustflags.arg("-Zosx-rpath-install-name");
                 Some(format!("-Wl,-rpath,@loader_path/../{libdir}"))
-            } else if !target.contains("windows")
-                && !target.contains("aix")
-                && !target.contains("xous")
-            {
+            } else if !target.is_windows() && !target.contains("aix") && !target.contains("xous") {
                 rustflags.arg("-Clink-args=-Wl,-z,origin");
                 Some(format!("-Wl,-rpath,$ORIGIN/../{libdir}"))
             } else {
@@ -1729,8 +1726,7 @@ impl<'a> Builder<'a> {
         let split_debuginfo_is_stable = target.contains("linux")
             || target.contains("apple")
             || (target.is_msvc() && self.config.rust_split_debuginfo == SplitDebuginfo::Packed)
-            || (target.contains("windows")
-                && self.config.rust_split_debuginfo == SplitDebuginfo::Off);
+            || (target.is_windows() && self.config.rust_split_debuginfo == SplitDebuginfo::Off);
 
         if !split_debuginfo_is_stable {
             rustflags.arg("-Zunstable-options");

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

@@ -421,10 +421,10 @@ impl std::str::FromStr for SplitDebuginfo {
 impl SplitDebuginfo {
     /// Returns the default `-Csplit-debuginfo` value for the current target. See the comment for
     /// `rust.split-debuginfo` in `config.example.toml`.
-    fn default_for_platform(target: &str) -> Self {
+    fn default_for_platform(target: TargetSelection) -> Self {
         if target.contains("apple") {
             SplitDebuginfo::Unpacked
-        } else if target.contains("windows") {
+        } else if target.is_windows() {
             SplitDebuginfo::Packed
         } else {
             SplitDebuginfo::Off
@@ -527,6 +527,10 @@ impl TargetSelection {
     pub fn is_msvc(&self) -> bool {
         self.contains("msvc")
     }
+
+    pub fn is_windows(&self) -> bool {
+        self.contains("windows")
+    }
 }
 
 impl fmt::Display for TargetSelection {
@@ -1595,7 +1599,7 @@ impl Config {
                 .as_deref()
                 .map(SplitDebuginfo::from_str)
                 .map(|v| v.expect("invalid value for rust.split_debuginfo"))
-                .unwrap_or(SplitDebuginfo::default_for_platform(&config.build.triple));
+                .unwrap_or(SplitDebuginfo::default_for_platform(config.build));
             optimize = optimize_toml;
             omit_git_hash = omit_git_hash_toml;
             config.rust_new_symbol_mangling = new_symbol_mangling;

src/bootstrap/src/utils/helpers.rs

@@ -49,7 +49,7 @@ pub use t;
 /// Given an executable called `name`, return the filename for the
 /// executable for a particular target.
 pub fn exe(name: &str, target: TargetSelection) -> String {
-    if target.contains("windows") {
+    if target.is_windows() {
         format!("{name}.exe")
     } else if target.contains("uefi") {
         format!("{name}.efi")
@@ -72,7 +72,7 @@ pub fn is_debug_info(name: &str) -> bool {
 /// Returns the corresponding relative library directory that the compiler's
 /// dylibs will be found in.
 pub fn libdir(target: TargetSelection) -> &'static str {
-    if target.contains("windows") { "bin" } else { "lib" }
+    if target.is_windows() { "bin" } else { "lib" }
 }
 
 /// Adds a list of lookup paths to `cmd`'s dynamic library lookup path.
@@ -191,7 +191,7 @@ pub fn target_supports_cranelift_backend(target: TargetSelection) -> bool {
             || target.contains("aarch64")
             || target.contains("s390x")
             || target.contains("riscv64gc")
-    } else if target.contains("darwin") || target.contains("windows") {
+    } else if target.contains("darwin") || target.is_windows() {
         target.contains("x86_64")
     } else {
         false
@@ -519,7 +519,7 @@ pub fn linker_flags(
         if matches!(lld_threads, LldThreads::No) {
             args.push(format!(
                 "-Clink-arg=-Wl,{}",
-                lld_flag_no_threads(builder.config.lld_mode, target.is_msvc())
+                lld_flag_no_threads(builder.config.lld_mode, target.is_windows())
             ));
         }
     }