gnullvm: link libunwind statically by default

compiler/rustc_codegen_ssa/src/back/linker.rs

@@ -536,7 +536,7 @@ impl<'a> Linker for GccLinker<'a> {
             LinkOutputKind::StaticNoPicExe => {
                 // `-static` works for both gcc wrapper and ld.
                 self.link_or_cc_arg("-static");
-                if !self.is_ld && self.is_gnu {
+                if !self.is_ld && self.is_gnu && !self.sess.target.is_like_windows {
                     self.cc_arg("-no-pie");
                 }
             }

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

@@ -13,13 +13,14 @@ pub(crate) fn opts() -> TargetOptions {
     // but LLVM maintainers rejected it: https://reviews.llvm.org/D51440
     let pre_link_args = TargetOptions::link_args(
         LinkerFlavor::Gnu(Cc::Yes, Lld::No),
-        &["-nolibc", "--unwindlib=none"],
+        &["-nolibc", "--unwindlib=libunwind", "-static-libgcc"],
     );
     // Order of `late_link_args*` does not matter with LLD.
     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::No, Lld::No), &["-l:libunwind.a"]);
     add_link_args(&mut late_link_args, LinkerFlavor::Gnu(Cc::Yes, Lld::No), mingw_libs);
 
     TargetOptions {
@@ -46,8 +47,6 @@ pub(crate) fn opts() -> TargetOptions {
         eh_frame_header: false,
         no_default_libraries: false,
         has_thread_local: true,
-        crt_static_allows_dylibs: true,
-        crt_static_respected: true,
         debuginfo_kind: DebuginfoKind::Dwarf,
         // FIXME(davidtwco): Support Split DWARF on Windows GNU - may require LLVM changes to
         // output DWO, despite using DWARF, doesn't use ELF..

library/unwind/src/lib.rs

@@ -214,8 +214,3 @@ cfg_select! {
 #[cfg(target_os = "hurd")]
 #[link(name = "gcc_s")]
 unsafe extern "C" {}
-
-#[cfg(all(target_os = "windows", target_env = "gnu", target_abi = "llvm"))]
-#[link(name = "unwind", kind = "static", modifiers = "-bundle", cfg(target_feature = "crt-static"))]
-#[link(name = "unwind", cfg(not(target_feature = "crt-static")))]
-unsafe extern "C" {}

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

@@ -357,6 +357,7 @@ fn copy_third_party_objects(
     }
 
     if target == "x86_64-fortanix-unknown-sgx"
+        || target.ends_with("windows-gnullvm")
         || builder.config.llvm_libunwind(target) == LlvmLibunwind::InTree
             && (target.contains("linux")
                 || target.contains("fuchsia")

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

@@ -1751,6 +1751,7 @@ impl CommandLineStep for Libunwind {
             cfg.define("_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS", None);
             cfg.define("_LIBUNWIND_IS_NATIVE_ONLY", "1");
             cfg.include(root.join("include"));
+            cfg.include(root.join("src"));
             cfg.cargo_metadata(false);
             cfg.out_dir(&out_dir);