Build rtstartup for none sysroot too

Even mini_core needs it

Author: bjorn3

build_system/build_sysroot.rs

@@ -129,7 +129,8 @@ fn build_sysroot_for_triple(
     sysroot_kind: SysrootKind,
 ) -> SysrootTarget {
     match sysroot_kind {
-        SysrootKind::None => SysrootTarget { triple: compiler.triple, libs: vec![] },
+        SysrootKind::None => build_rtstartup(dirs, &compiler)
+            .unwrap_or(SysrootTarget { triple: compiler.triple, libs: vec![] }),
         SysrootKind::Llvm => build_llvm_sysroot_for_triple(compiler),
         SysrootKind::Clif => {
             build_clif_sysroot_for_triple(dirs, channel, compiler, &cg_clif_dylib_path)
@@ -198,31 +199,10 @@ fn build_clif_sysroot_for_triple(
 
     let mut target_libs = SysrootTarget { triple: compiler.triple.clone(), libs: vec![] };
 
-    if compiler.triple.ends_with("windows-gnu") {
-        eprintln!("[BUILD] rtstartup for {}", compiler.triple);
-
-        RTSTARTUP_SYSROOT.ensure_fresh(dirs);
-
-        let rtstartup_src = SYSROOT_SRC.to_path(dirs).join("library").join("rtstartup");
-        let mut rtstartup_target_libs =
-            SysrootTarget { triple: compiler.triple.clone(), libs: vec![] };
-
-        for file in ["rsbegin", "rsend"] {
-            let obj = RTSTARTUP_SYSROOT.to_path(dirs).join(format!("{file}.o"));
-            let mut build_rtstartup_cmd = Command::new(&compiler.rustc);
-            build_rtstartup_cmd
-                .arg("--target")
-                .arg(&compiler.triple)
-                .arg("--emit=obj")
-                .arg("-o")
-                .arg(&obj)
-                .arg(rtstartup_src.join(format!("{file}.rs")));
-            spawn_and_wait(build_rtstartup_cmd);
-            rtstartup_target_libs.libs.push(obj.clone());
-            target_libs.libs.push(obj);
-        }
-
+    if let Some(rtstartup_target_libs) = build_rtstartup(dirs, &compiler) {
         rtstartup_target_libs.install_into_sysroot(&RTSTARTUP_SYSROOT.to_path(dirs));
+
+        target_libs.libs.extend(rtstartup_target_libs.libs);
     }
 
     let build_dir = STANDARD_LIBRARY.target_dir(dirs).join(&compiler.triple).join(channel);
@@ -266,3 +246,30 @@ fn build_clif_sysroot_for_triple(
 
     target_libs
 }
+
+fn build_rtstartup(dirs: &Dirs, compiler: &Compiler) -> Option<SysrootTarget> {
+    if !compiler.triple.ends_with("windows-gnu") {
+        return None;
+    }
+
+    RTSTARTUP_SYSROOT.ensure_fresh(dirs);
+
+    let rtstartup_src = SYSROOT_SRC.to_path(dirs).join("library").join("rtstartup");
+    let mut target_libs = SysrootTarget { triple: compiler.triple.clone(), libs: vec![] };
+
+    for file in ["rsbegin", "rsend"] {
+        let obj = RTSTARTUP_SYSROOT.to_path(dirs).join(format!("{file}.o"));
+        let mut build_rtstartup_cmd = Command::new(&compiler.rustc);
+        build_rtstartup_cmd
+            .arg("--target")
+            .arg(&compiler.triple)
+            .arg("--emit=obj")
+            .arg("-o")
+            .arg(&obj)
+            .arg(rtstartup_src.join(format!("{file}.rs")));
+        spawn_and_wait(build_rtstartup_cmd);
+        target_libs.libs.push(obj.clone());
+    }
+
+    Some(target_libs)
+}