Windows-gnullvm self-contained

compiler/rustc_codegen_cranelift/src/toolchain.rs

@@ -4,10 +4,12 @@ use std::path::PathBuf;
 
 use rustc_codegen_ssa::back::link::linker_and_flavor;
 use rustc_session::Session;
+use rustc_target::spec::LinkSelfContainedComponents;
 
 /// Tries to infer the path of a binary for the target toolchain from the linker name.
 pub(crate) fn get_toolchain_binary(sess: &Session, tool: &str) -> PathBuf {
-    let (mut linker, _linker_flavor) = linker_and_flavor(sess);
+    let (mut linker, _linker_flavor) =
+        linker_and_flavor(sess, &LinkSelfContainedComponents::empty());
     let linker_file_name =
         linker.file_name().unwrap().to_str().expect("linker filename should be valid UTF-8");
 

compiler/rustc_codegen_ssa/src/back/link.rs

@@ -685,8 +685,8 @@ fn link_natively(
     codegen_backend: &'static str,
 ) {
     info!("preparing {:?} to {:?}", crate_type, out_filename);
-    let (linker_path, flavor) = linker_and_flavor(sess);
-    let self_contained_components = self_contained_components(sess, crate_type, &linker_path);
+    let self_contained_components = self_contained_components(sess, crate_type);
+    let (linker_path, flavor) = linker_and_flavor(sess, &self_contained_components);
 
     // On AIX, we ship all libraries as .a big_af archive
     // the expected format is lib<name>.a(libname.so) for the actual
@@ -1318,7 +1318,10 @@ pub fn ignored_for_lto(sess: &Session, info: &CrateInfo, cnum: CrateNum) -> bool
 }
 
 /// This functions tries to determine the appropriate linker (and corresponding LinkerFlavor) to use
-pub fn linker_and_flavor(sess: &Session) -> (PathBuf, LinkerFlavor) {
+pub fn linker_and_flavor(
+    sess: &Session,
+    self_contained_components: &LinkSelfContainedComponents,
+) -> (PathBuf, LinkerFlavor) {
     fn infer_from(
         sess: &Session,
         linker: Option<PathBuf>,
@@ -1415,6 +1418,18 @@ pub fn linker_and_flavor(sess: &Session) -> (PathBuf, LinkerFlavor) {
         return ret;
     }
 
+    // When using a supported target in self-contained linker mode, we want to use rust-lld directly.
+    let self_contained_target = sess.target.os == Os::Windows
+        && sess.target.env == Env::Gnu
+        && sess.target.abi == Abi::Llvm
+        && self_contained_components.is_linker_enabled();
+    if self_contained_target
+        && let Some(ret) =
+            infer_from(sess, None, Some(LinkerFlavor::Gnu(Cc::No, Lld::Yes)), features)
+    {
+        return ret;
+    }
+
     if let Some(ret) = infer_from(
         sess,
         sess.target.linker.as_deref().map(PathBuf::from),
@@ -1761,20 +1776,34 @@ fn link_output_kind(sess: &Session, crate_type: CrateType) -> LinkOutputKind {
     }
 }
 
-// Returns true if linker is located within sysroot
-fn detect_self_contained_mingw(sess: &Session, linker: &Path) -> bool {
-    // Assume `-C linker=rust-lld` as self-contained mode
-    if linker == Path::new("rust-lld") {
-        return true;
+/// Returns true if linker is shipped by Rust.
+// There are currently two different solutions for self-contained mode with mingw-w64:
+// using rust-lld directly (`-gnullvm`) or using shipped cc to call the linker (`-gnu`).
+// Eventually, `-gnu` toolchains might be moved to calling the linker directly.
+fn detect_self_contained_mingw(sess: &Session) -> bool {
+    // Passing custom linker means non-self-contained mode.
+    if sess.opts.cg.linker.is_some() {
+        // Unless running on `-windows-gnu-llvm` and using `-C linker=rust-lld`.
+        if sess.target.abi == Abi::Llvm {
+            return sess
+                .opts
+                .cg
+                .linker
+                .as_ref()
+                .is_some_and(|linker| linker == Path::new("rust-lld"));
+        }
+
+        return false;
     }
-    let linker_with_extension = if cfg!(windows) && linker.extension().is_none() {
+
+    let linker_with_extension = if let Some(linker) = sess.target.linker.as_deref().map(Path::new) {
         linker.with_extension("exe")
     } else {
-        linker.to_path_buf()
+        return false;
     };
     for dir in env::split_paths(&env::var_os("PATH").unwrap_or_default()) {
         let full_path = dir.join(&linker_with_extension);
-        // If linker comes from sysroot assume self-contained mode
+        // If linker doesn't come from sysroot assume non-self-contained mode
         if full_path.is_file() && !full_path.starts_with(sess.opts.sysroot.path()) {
             return false;
         }
@@ -1785,11 +1814,7 @@ fn detect_self_contained_mingw(sess: &Session, linker: &Path) -> bool {
 /// Various toolchain components used during linking are used from rustc distribution
 /// instead of being found somewhere on the host system.
 /// We only provide such support for a very limited number of targets.
-fn self_contained_components(
-    sess: &Session,
-    crate_type: CrateType,
-    linker: &Path,
-) -> LinkSelfContainedComponents {
+fn self_contained_components(sess: &Session, crate_type: CrateType) -> LinkSelfContainedComponents {
     // Turn the backwards compatible bool values for `self_contained` into fully inferred
     // `LinkSelfContainedComponents`.
     let self_contained =
@@ -1818,7 +1843,7 @@ fn self_contained_components(
                 LinkSelfContainedDefault::InferredForMingw => {
                     sess.host == sess.target
                         && sess.target.abi != Abi::Uwp
-                        && detect_self_contained_mingw(sess, linker)
+                        && detect_self_contained_mingw(sess)
                 }
             }
         };

compiler/rustc_target/src/spec/base/windows_gnullvm.rs

@@ -1,8 +1,9 @@
 use std::borrow::Cow;
 
+use crate::spec::crt_objects::pre_mingw_self_contained;
 use crate::spec::{
-    Abi, BinaryFormat, Cc, DebuginfoKind, Env, LinkerFlavor, Lld, Os, SplitDebuginfo,
-    TargetOptions, cvs,
+    Abi, BinaryFormat, Cc, DebuginfoKind, Env, LinkSelfContainedDefault, LinkerFlavor, Lld, Os,
+    SplitDebuginfo, TargetOptions, add_link_args, cvs,
 };
 
 pub(crate) fn opts() -> TargetOptions {
@@ -15,10 +16,11 @@ pub(crate) fn opts() -> TargetOptions {
         &["-nolibc", "--unwindlib=none"],
     );
     // Order of `late_link_args*` does not matter with LLD.
-    let late_link_args = TargetOptions::link_args(
-        LinkerFlavor::Gnu(Cc::Yes, Lld::No),
-        &["-lmingw32", "-lmingwex", "-lmsvcrt", "-lkernel32", "-luser32"],
-    );
+    let mingw_libs = &["-lmingw32", "-lmingwex", "-lmsvcrt", "-lkernel32", "-luser32"];
+
+    let mut late_link_args =
+        TargetOptions::link_args(LinkerFlavor::Gnu(Cc::No, Lld::No), mingw_libs);
+    add_link_args(&mut late_link_args, LinkerFlavor::Gnu(Cc::Yes, Lld::No), mingw_libs);
 
     TargetOptions {
         os: Os::Windows,
@@ -36,6 +38,8 @@ pub(crate) fn opts() -> TargetOptions {
         binary_format: BinaryFormat::Coff,
         allows_weak_linkage: false,
         pre_link_args,
+        pre_link_objects_self_contained: pre_mingw_self_contained(),
+        link_self_contained: LinkSelfContainedDefault::InferredForMingw,
         late_link_args,
         abi_return_struct_as_int: true,
         emit_debug_gdb_scripts: false,

compiler/rustc_target/src/spec/targets/x86_64_pc_windows_gnullvm.rs

@@ -6,6 +6,7 @@ pub(crate) fn target() -> Target {
     base.features = "+cx16,+sse3,+sahf".into();
     base.plt_by_default = false;
     base.add_pre_link_args(LinkerFlavor::Gnu(Cc::Yes, Lld::No), &["-m64"]);
+    base.add_pre_link_args(LinkerFlavor::Gnu(Cc::No, Lld::No), &["-m", "i386pep"]);
     base.max_atomic_width = Some(128);
     base.linker = Some("x86_64-w64-mingw32-clang".into());
 

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

@@ -448,7 +448,7 @@ fn copy_self_contained_objects(
                 DependencyType::TargetSelfContained,
             );
         }
-    } else if target.is_windows_gnu() {
+    } else if target.is_windows_gnu() || target.is_windows_gnullvm() {
         for obj in ["crt2.o", "dllcrt2.o"].iter() {
             let src = compiler_file(builder, &builder.cc(target), target, CLang::C, obj);
             let dst = libdir_self_contained.join(obj);

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

@@ -344,6 +344,44 @@ fn runtime_dll_dist(rust_root: &Path, target: TargetSelection, builder: &Builder
     }
 }
 
+fn make_win_llvm_dist(plat_root: &Path, target: TargetSelection, builder: &Builder<'_>) {
+    if builder.config.dry_run() {
+        return;
+    }
+
+    let (_, lib_path) = get_cc_search_dirs(target, builder);
+
+    // Libraries necessary to link the windows-gnullvm toolchains.
+    // System libraries will be preferred if they are available (see #67429).
+    let target_libs = [
+        // MinGW libs
+        "libunwind.a",
+        "libunwind.dll.a",
+        "libmingw32.a",
+        "libmingwex.a",
+        "libmsvcrt.a",
+        // Windows import libs, remove them once std transitions to raw-dylib
+        "libkernel32.a",
+        "libuser32.a",
+        "libntdll.a",
+        "libuserenv.a",
+        "libws2_32.a",
+        "libdbghelp.a",
+    ];
+
+    //Find mingw artifacts we want to bundle
+    let target_libs = find_files(&target_libs, &lib_path);
+
+    //Copy platform libs to platform-specific lib directory
+    let plat_target_lib_self_contained_dir =
+        plat_root.join("lib/rustlib").join(target).join("lib/self-contained");
+    fs::create_dir_all(&plat_target_lib_self_contained_dir)
+        .expect("creating plat_target_lib_self_contained_dir failed");
+    for src in target_libs {
+        builder.copy_link_to_folder(&src, &plat_target_lib_self_contained_dir);
+    }
+}
+
 fn get_cc_search_dirs(
     target: TargetSelection,
     builder: &Builder<'_>,
@@ -394,14 +432,20 @@ impl Step for Mingw {
 
     fn run(self, builder: &Builder<'_>) -> Option<GeneratedTarball> {
         let target = self.target;
-        if !target.ends_with("pc-windows-gnu") || !builder.config.dist_include_mingw_linker {
+        if !target.contains("pc-windows-gnu") || !builder.config.dist_include_mingw_linker {
             return None;
         }
 
         let mut tarball = Tarball::new(builder, "rust-mingw", &target.triple);
         tarball.set_product_name("Rust MinGW");
 
-        make_win_dist(tarball.image_dir(), target, builder);
+        if target.ends_with("pc-windows-gnu") {
+            make_win_dist(tarball.image_dir(), target, builder);
+        } else if target.ends_with("pc-windows-gnullvm") {
+            make_win_llvm_dist(tarball.image_dir(), target, builder);
+        } else {
+            unreachable!();
+        }
 
         Some(tarball.generate())
     }

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

@@ -86,6 +86,10 @@ impl TargetSelection {
         self.ends_with("windows-gnu")
     }
 
+    pub fn is_windows_gnullvm(&self) -> bool {
+        self.ends_with("windows-gnullvm")
+    }
+
     pub fn is_cygwin(&self) -> bool {
         self.is_windows() &&
         // ref. https://cygwin.com/pipermail/cygwin/2022-February/250802.html

src/tools/build-manifest/src/main.rs

@@ -476,7 +476,7 @@ impl Builder {
                 }
                 // so is rust-mingw if it's available for the target
                 PkgType::RustMingw => {
-                    if host.ends_with("pc-windows-gnu") {
+                    if host.contains("pc-windows-gnu") {
                         components.push(host_component(pkg));
                     }
                 }