Fix everything

compiler/rustc_codegen_cranelift/build_system/tests.rs

@@ -475,6 +475,7 @@ impl<'a> TestRunner<'a> {
         cmd.arg("-Zunstable-options");
         cmd.arg("--check-cfg=cfg(no_unstable_features)");
         cmd.arg("--check-cfg=cfg(jit)");
+        cmd.arg("--emit=metadata,link");
         cmd.args(args);
         cmd
     }

compiler/rustc_metadata/src/rmeta/encoder.rs

@@ -1,4 +1,4 @@
-use crate::errors::{FailCreateFileEncoder, FailWriteFile};
+use crate::errors::{FailCreateFileEncoder, FailWriteFile, FailedCreateFile};
 use crate::rmeta::*;
 
 use rustc_ast::Attribute;
@@ -2274,6 +2274,10 @@ pub fn encode_metadata(tcx: TyCtxt<'_>, path: &Path, ref_path: &Path) {
             });
             header.position.get()
         });
+    } else {
+        std::fs::File::create(&ref_path).unwrap_or_else(|err| {
+            tcx.dcx().emit_fatal(FailedCreateFile { filename: &ref_path, err });
+        });
     }
 }
 

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

@@ -1989,7 +1989,12 @@ pub fn run_cargo(
             let file_stem = parts.next().unwrap().to_owned();
             let extension = parts.next().unwrap().to_owned();
 
-            toplevel.push((file_stem, extension, expected_len));
+            if extension == "so" || extension == "dylib" {
+                // FIXME workaround for the fact that cargo doesn't understand `-Zsplit-metadata`
+                toplevel.push((file_stem.clone(), "rmeta".to_owned(), None));
+            }
+
+            toplevel.push((file_stem, extension, Some(expected_len)));
         }
     });
 
@@ -2010,7 +2015,7 @@ pub fn run_cargo(
         .collect::<Vec<_>>();
     for (prefix, extension, expected_len) in toplevel {
         let candidates = contents.iter().filter(|&(_, filename, meta)| {
-            meta.len() == expected_len
+            expected_len.map_or(true, |expected_len| meta.len() == expected_len)
                 && filename
                     .strip_prefix(&prefix[..])
                     .map(|s| s.starts_with('-') && s.ends_with(&extension[..]))
@@ -2021,6 +2026,7 @@ pub fn run_cargo(
         });
         let path_to_add = match max {
             Some(triple) => triple.0.to_str().unwrap(),
+            None if extension == "rmeta" => continue, // cfg(not(bootstrap)) remove this once -Zsplit-metadata is passed for all stages
             None => panic!("no output generated for {prefix:?} {extension:?}"),
         };
         if is_dylib(path_to_add) {

tests/ui/duplicate_entry_error.rs

@@ -1,4 +1,4 @@
-//@ normalize-stderr-test "loaded from .*libstd-.*.rlib" -> "loaded from SYSROOT/libstd-*.rlib"
+//@ normalize-stderr-test "loaded from .*libstd-.*.rmeta" -> "loaded from SYSROOT/libstd-*.rmeta"
 // note-pattern: first defined in crate `std`.
 
 // Test for issue #31788 and E0152
@@ -9,7 +9,7 @@ use std::panic::PanicInfo;
 
 #[lang = "panic_impl"]
 fn panic_impl(info: &PanicInfo) -> ! {
-//~^ ERROR: found duplicate lang item `panic_impl`
+    //~^ ERROR: found duplicate lang item `panic_impl`
     loop {}
 }
 

tests/ui/duplicate_entry_error.stderr

@@ -8,7 +8,7 @@ LL | | }
    | |_^
    |
    = note: the lang item is first defined in crate `std` (which `duplicate_entry_error` depends on)
-   = note: first definition in `std` loaded from SYSROOT/libstd-*.rlib
+   = note: first definition in `std` loaded from SYSROOT/libstd-*.rmeta
    = note: second definition in the local crate (`duplicate_entry_error`)
 
 error: aborting due to 1 previous error

tests/ui/error-codes/E0152.rs

@@ -1,8 +1,7 @@
-//@ normalize-stderr-test "loaded from .*liballoc-.*.rlib" -> "loaded from SYSROOT/liballoc-*.rlib"
+//@ normalize-stderr-test "loaded from .*liballoc-.*.rmeta" -> "loaded from SYSROOT/liballoc-*.rmeta"
 #![feature(lang_items)]
 
 #[lang = "owned_box"]
 struct Foo<T>(T); //~ ERROR E0152
 
-fn main() {
-}
+fn main() {}

tests/ui/error-codes/E0152.stderr

@@ -5,7 +5,7 @@ LL | struct Foo<T>(T);
    | ^^^^^^^^^^^^^^^^^
    |
    = note: the lang item is first defined in crate `alloc` (which `std` depends on)
-   = note: first definition in `alloc` loaded from SYSROOT/liballoc-*.rlib
+   = note: first definition in `alloc` loaded from SYSROOT/liballoc-*.rmeta
    = note: second definition in the local crate (`E0152`)
 
 error: aborting due to 1 previous error

tests/ui/lang-items/duplicate.rs

@@ -1,4 +1,4 @@
-//@ normalize-stderr-test "loaded from .*libcore-.*.rlib" -> "loaded from SYSROOT/libcore-*.rlib"
+//@ normalize-stderr-test "loaded from .*libcore-.*.rmeta" -> "loaded from SYSROOT/libcore-*.rmeta"
 #![feature(lang_items)]
 
 #[lang = "sized"]

tests/ui/lang-items/duplicate.stderr

@@ -5,7 +5,7 @@ LL | trait Sized {}
    | ^^^^^^^^^^^^^^
    |
    = note: the lang item is first defined in crate `core` (which `std` depends on)
-   = note: first definition in `core` loaded from SYSROOT/libcore-*.rlib
+   = note: first definition in `core` loaded from SYSROOT/libcore-*.rmeta
    = note: second definition in the local crate (`duplicate`)
 
 error: aborting due to 1 previous error

tests/ui/panic-handler/panic-handler-std.rs

@@ -1,4 +1,4 @@
-//@ normalize-stderr-test "loaded from .*libstd-.*.rlib" -> "loaded from SYSROOT/libstd-*.rlib"
+//@ normalize-stderr-test "loaded from .*libstd-.*.rmeta" -> "loaded from SYSROOT/libstd-*.rmeta"
 //@ error-pattern: found duplicate lang item `panic_impl`
 
 

tests/ui/panic-handler/panic-handler-std.stderr

@@ -7,7 +7,7 @@ LL | | }
    | |_^
    |
    = note: the lang item is first defined in crate `std` (which `panic_handler_std` depends on)
-   = note: first definition in `std` loaded from SYSROOT/libstd-*.rlib
+   = note: first definition in `std` loaded from SYSROOT/libstd-*.rmeta
    = note: second definition in the local crate (`panic_handler_std`)
 
 error: aborting due to 1 previous error