diff --git a/compiler/rustc_codegen_ssa/src/back/link.rs b/compiler/rustc_codegen_ssa/src/back/link.rs index b59d73a9aae09..7d41108724175 100644 --- a/compiler/rustc_codegen_ssa/src/back/link.rs +++ b/compiler/rustc_codegen_ssa/src/back/link.rs @@ -294,7 +294,7 @@ fn link_rlib<'a>( let (metadata, metadata_position) = create_wrapper_file( sess, ".rmeta".to_string(), - codegen_results.metadata.raw_data(), + codegen_results.metadata.stub_or_full(), ); let metadata = emit_wrapper_file(sess, &metadata, tmpdir, METADATA_FILENAME); match metadata_position { diff --git a/compiler/rustc_codegen_ssa/src/back/metadata.rs b/compiler/rustc_codegen_ssa/src/back/metadata.rs index 68b453ff42425..ac9ac9bbb31f6 100644 --- a/compiler/rustc_codegen_ssa/src/back/metadata.rs +++ b/compiler/rustc_codegen_ssa/src/back/metadata.rs @@ -540,8 +540,8 @@ pub fn create_compressed_metadata_file( symbol_name: &str, ) -> Vec { let mut packed_metadata = rustc_metadata::METADATA_HEADER.to_vec(); - packed_metadata.write_all(&(metadata.raw_data().len() as u64).to_le_bytes()).unwrap(); - packed_metadata.extend(metadata.raw_data()); + packed_metadata.write_all(&(metadata.stub_or_full().len() as u64).to_le_bytes()).unwrap(); + packed_metadata.extend(metadata.stub_or_full()); let Some(mut file) = create_object_file(sess) else { if sess.target.is_like_wasm { diff --git a/compiler/rustc_interface/src/tests.rs b/compiler/rustc_interface/src/tests.rs index b44be1710edf7..4592e01443880 100644 --- a/compiler/rustc_interface/src/tests.rs +++ b/compiler/rustc_interface/src/tests.rs @@ -787,6 +787,7 @@ fn test_unstable_options_tracking_hash() { tracked!(direct_access_external_data, Some(true)); tracked!(dual_proc_macros, true); tracked!(dwarf_version, Some(5)); + tracked!(embed_metadata, false); tracked!(embed_source, true); tracked!(emit_thin_lto, false); tracked!(emscripten_wasm_eh, true); diff --git a/compiler/rustc_metadata/messages.ftl b/compiler/rustc_metadata/messages.ftl index 9adbcabcf4506..d997ba198aca8 100644 --- a/compiler/rustc_metadata/messages.ftl +++ b/compiler/rustc_metadata/messages.ftl @@ -97,6 +97,10 @@ metadata_found_staticlib = found staticlib `{$crate_name}` instead of rlib or dylib{$add_info} .help = please recompile that crate using --crate-type lib +metadata_full_metadata_not_found = + only metadata stub found for `{$flavor}` dependency `{$crate_name}` + please provide path to the corresponding .rmeta file with full metadata + metadata_global_alloc_required = no global memory allocator found but one is required; link to std or add `#[global_allocator]` to a static item that implements the GlobalAlloc trait diff --git a/compiler/rustc_metadata/src/errors.rs b/compiler/rustc_metadata/src/errors.rs index 0c54628598c48..c45daeda85dbc 100644 --- a/compiler/rustc_metadata/src/errors.rs +++ b/compiler/rustc_metadata/src/errors.rs @@ -525,6 +525,15 @@ impl Diagnostic<'_, G> for MultipleCandidates { } } +#[derive(Diagnostic)] +#[diag(metadata_full_metadata_not_found)] +pub(crate) struct FullMetadataNotFound { + #[primary_span] + pub span: Span, + pub flavor: CrateFlavor, + pub crate_name: Symbol, +} + #[derive(Diagnostic)] #[diag(metadata_symbol_conflicts_current, code = E0519)] pub struct SymbolConflictsCurrent { diff --git a/compiler/rustc_metadata/src/fs.rs b/compiler/rustc_metadata/src/fs.rs index 4450d050c8e1f..c4e1e0f1d1a99 100644 --- a/compiler/rustc_metadata/src/fs.rs +++ b/compiler/rustc_metadata/src/fs.rs @@ -3,7 +3,7 @@ use std::{fs, io}; use rustc_data_structures::temp_dir::MaybeTempDir; use rustc_middle::ty::TyCtxt; -use rustc_session::config::{OutFileName, OutputType}; +use rustc_session::config::{CrateType, OutFileName, OutputType}; use rustc_session::output::filename_for_metadata; use rustc_session::{MetadataKind, Session}; use tempfile::Builder as TempFileBuilder; @@ -50,7 +50,14 @@ pub fn encode_and_write_metadata(tcx: TyCtxt<'_>) -> (EncodedMetadata, bool) { .tempdir_in(out_filename.parent().unwrap_or_else(|| Path::new(""))) .unwrap_or_else(|err| tcx.dcx().emit_fatal(FailedCreateTempdir { err })); let metadata_tmpdir = MaybeTempDir::new(metadata_tmpdir, tcx.sess.opts.cg.save_temps); - let metadata_filename = metadata_tmpdir.as_ref().join(METADATA_FILENAME); + let metadata_filename = metadata_tmpdir.as_ref().join("full.rmeta"); + let metadata_stub_filename = if !tcx.sess.opts.unstable_opts.embed_metadata + && !tcx.crate_types().contains(&CrateType::ProcMacro) + { + Some(metadata_tmpdir.as_ref().join("stub.rmeta")) + } else { + None + }; // Always create a file at `metadata_filename`, even if we have nothing to write to it. // This simplifies the creation of the output `out_filename` when requested. @@ -60,9 +67,15 @@ pub fn encode_and_write_metadata(tcx: TyCtxt<'_>) -> (EncodedMetadata, bool) { std::fs::File::create(&metadata_filename).unwrap_or_else(|err| { tcx.dcx().emit_fatal(FailedCreateFile { filename: &metadata_filename, err }); }); + if let Some(metadata_stub_filename) = &metadata_stub_filename { + std::fs::File::create(metadata_stub_filename).unwrap_or_else(|err| { + tcx.dcx() + .emit_fatal(FailedCreateFile { filename: &metadata_stub_filename, err }); + }); + } } MetadataKind::Uncompressed | MetadataKind::Compressed => { - encode_metadata(tcx, &metadata_filename); + encode_metadata(tcx, &metadata_filename, metadata_stub_filename.as_deref()) } }; @@ -100,9 +113,10 @@ pub fn encode_and_write_metadata(tcx: TyCtxt<'_>) -> (EncodedMetadata, bool) { // Load metadata back to memory: codegen may need to include it in object files. let metadata = - EncodedMetadata::from_path(metadata_filename, metadata_tmpdir).unwrap_or_else(|err| { - tcx.dcx().emit_fatal(FailedCreateEncodedMetadata { err }); - }); + EncodedMetadata::from_path(metadata_filename, metadata_stub_filename, metadata_tmpdir) + .unwrap_or_else(|err| { + tcx.dcx().emit_fatal(FailedCreateEncodedMetadata { err }); + }); let need_metadata_module = metadata_kind == MetadataKind::Compressed; diff --git a/compiler/rustc_metadata/src/locator.rs b/compiler/rustc_metadata/src/locator.rs index d5dd5059aacc6..112954eca0dfe 100644 --- a/compiler/rustc_metadata/src/locator.rs +++ b/compiler/rustc_metadata/src/locator.rs @@ -654,7 +654,24 @@ impl<'a> CrateLocator<'a> { continue; } } - *slot = Some((hash, metadata, lib.clone())); + + // We error eagerly here. If we're locating a rlib, then in theory the full metadata + // could still be in a (later resolved) dylib. In practice, if the rlib and dylib + // were produced in a way where one has full metadata and the other hasn't, it would + // mean that they were compiled using different compiler flags and probably also have + // a different SVH value. + if metadata.get_header().is_stub { + // `is_stub` should never be true for .rmeta files. + assert_ne!(flavor, CrateFlavor::Rmeta); + + // Because rmeta files are resolved before rlib/dylib files, if this is a stub and + // we haven't found a slot already, it means that the full metadata is missing. + if slot.is_none() { + return Err(CrateError::FullMetadataNotFound(self.crate_name, flavor)); + } + } else { + *slot = Some((hash, metadata, lib.clone())); + } ret = Some((lib, kind)); } @@ -728,37 +745,25 @@ impl<'a> CrateLocator<'a> { let Some(file) = loc_orig.file_name().and_then(|s| s.to_str()) else { return Err(CrateError::ExternLocationNotFile(self.crate_name, loc_orig.clone())); }; - // FnMut cannot return reference to captured value, so references - // must be taken outside the closure. - let rlibs = &mut rlibs; - let rmetas = &mut rmetas; - let dylibs = &mut dylibs; - let type_via_filename = (|| { - if file.starts_with("lib") { - if file.ends_with(".rlib") { - return Some(rlibs); - } - if file.ends_with(".rmeta") { - return Some(rmetas); - } - } - let dll_prefix = self.target.dll_prefix.as_ref(); - let dll_suffix = self.target.dll_suffix.as_ref(); - if file.starts_with(dll_prefix) && file.ends_with(dll_suffix) { - return Some(dylibs); - } - None - })(); - match type_via_filename { - Some(type_via_filename) => { - type_via_filename.insert(loc_canon.clone(), PathKind::ExternFlag); + if file.starts_with("lib") { + if file.ends_with(".rlib") { + rlibs.insert(loc_canon.clone(), PathKind::ExternFlag); + continue; } - None => { - self.crate_rejections - .via_filename - .push(CrateMismatch { path: loc_orig.clone(), got: String::new() }); + if file.ends_with(".rmeta") { + rmetas.insert(loc_canon.clone(), PathKind::ExternFlag); + continue; } } + let dll_prefix = self.target.dll_prefix.as_ref(); + let dll_suffix = self.target.dll_suffix.as_ref(); + if file.starts_with(dll_prefix) && file.ends_with(dll_suffix) { + dylibs.insert(loc_canon.clone(), PathKind::ExternFlag); + continue; + } + self.crate_rejections + .via_filename + .push(CrateMismatch { path: loc_orig.clone(), got: String::new() }); } // Extract the dylib/rlib/rmeta triple. @@ -928,6 +933,7 @@ pub(crate) enum CrateError { ExternLocationNotExist(Symbol, PathBuf), ExternLocationNotFile(Symbol, PathBuf), MultipleCandidates(Symbol, CrateFlavor, Vec), + FullMetadataNotFound(Symbol, CrateFlavor), SymbolConflictsCurrent(Symbol), StableCrateIdCollision(Symbol, Symbol), DlOpen(String, String), @@ -978,6 +984,9 @@ impl CrateError { CrateError::MultipleCandidates(crate_name, flavor, candidates) => { dcx.emit_err(errors::MultipleCandidates { span, crate_name, flavor, candidates }); } + CrateError::FullMetadataNotFound(crate_name, flavor) => { + dcx.emit_err(errors::FullMetadataNotFound { span, crate_name, flavor }); + } CrateError::SymbolConflictsCurrent(root_name) => { dcx.emit_err(errors::SymbolConflictsCurrent { span, crate_name: root_name }); } diff --git a/compiler/rustc_metadata/src/rmeta/encoder.rs b/compiler/rustc_metadata/src/rmeta/encoder.rs index 7ab3d432bdf81..386d3d3156a1c 100644 --- a/compiler/rustc_metadata/src/rmeta/encoder.rs +++ b/compiler/rustc_metadata/src/rmeta/encoder.rs @@ -701,6 +701,7 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> { triple: tcx.sess.opts.target_triple.clone(), hash: tcx.crate_hash(LOCAL_CRATE), is_proc_macro_crate: proc_macro_data.is_some(), + is_stub: false, }, extra_filename: tcx.sess.opts.cg.extra_filename.clone(), stable_crate_id: tcx.def_path_hash(LOCAL_CRATE.as_def_id()).stable_crate_id(), @@ -2231,8 +2232,12 @@ fn prefetch_mir(tcx: TyCtxt<'_>) { // generated regardless of trailing bytes that end up in it. pub struct EncodedMetadata { - // The declaration order matters because `mmap` should be dropped before `_temp_dir`. - mmap: Option, + // The declaration order matters because `full_metadata` should be dropped + // before `_temp_dir`. + full_metadata: Option, + // This is an optional stub metadata containing only the crate header. + // The header should be very small, so we load it directly into memory. + stub_metadata: Option>, // We need to carry MaybeTempDir to avoid deleting the temporary // directory while accessing the Mmap. _temp_dir: Option, @@ -2240,33 +2245,50 @@ pub struct EncodedMetadata { impl EncodedMetadata { #[inline] - pub fn from_path(path: PathBuf, temp_dir: Option) -> std::io::Result { + pub fn from_path( + path: PathBuf, + stub_path: Option, + temp_dir: Option, + ) -> std::io::Result { let file = std::fs::File::open(&path)?; let file_metadata = file.metadata()?; if file_metadata.len() == 0 { - return Ok(Self { mmap: None, _temp_dir: None }); + return Ok(Self { full_metadata: None, stub_metadata: None, _temp_dir: None }); } - let mmap = unsafe { Some(Mmap::map(file)?) }; - Ok(Self { mmap, _temp_dir: temp_dir }) + let full_mmap = unsafe { Some(Mmap::map(file)?) }; + + let stub = + if let Some(stub_path) = stub_path { Some(std::fs::read(stub_path)?) } else { None }; + + Ok(Self { full_metadata: full_mmap, stub_metadata: stub, _temp_dir: temp_dir }) + } + + #[inline] + pub fn full(&self) -> &[u8] { + &self.full_metadata.as_deref().unwrap_or_default() } #[inline] - pub fn raw_data(&self) -> &[u8] { - self.mmap.as_deref().unwrap_or_default() + pub fn stub_or_full(&self) -> &[u8] { + self.stub_metadata.as_deref().unwrap_or(self.full()) } } impl Encodable for EncodedMetadata { fn encode(&self, s: &mut S) { - let slice = self.raw_data(); + self.stub_metadata.encode(s); + + let slice = self.full(); slice.encode(s) } } impl Decodable for EncodedMetadata { fn decode(d: &mut D) -> Self { + let stub = >>::decode(d); + let len = d.read_usize(); - let mmap = if len > 0 { + let full_metadata = if len > 0 { let mut mmap = MmapMut::map_anon(len).unwrap(); mmap.copy_from_slice(d.read_raw_bytes(len)); Some(mmap.make_read_only().unwrap()) @@ -2274,11 +2296,11 @@ impl Decodable for EncodedMetadata { None }; - Self { mmap, _temp_dir: None } + Self { full_metadata, stub_metadata: stub, _temp_dir: None } } } -pub fn encode_metadata(tcx: TyCtxt<'_>, path: &Path) { +pub fn encode_metadata(tcx: TyCtxt<'_>, path: &Path, ref_path: Option<&Path>) { let _prof_timer = tcx.prof.verbose_generic_activity("generate_crate_metadata"); // Since encoding metadata is not in a query, and nothing is cached, @@ -2292,6 +2314,42 @@ pub fn encode_metadata(tcx: TyCtxt<'_>, path: &Path) { join(|| prefetch_mir(tcx), || tcx.exported_symbols(LOCAL_CRATE)); } + with_encode_metadata_header(tcx, path, |ecx| { + // Encode all the entries and extra information in the crate, + // culminating in the `CrateRoot` which points to all of it. + let root = ecx.encode_crate_root(); + + // Flush buffer to ensure backing file has the correct size. + ecx.opaque.flush(); + // Record metadata size for self-profiling + tcx.prof.artifact_size( + "crate_metadata", + "crate_metadata", + ecx.opaque.file().metadata().unwrap().len(), + ); + + root.position.get() + }); + + if let Some(ref_path) = ref_path { + with_encode_metadata_header(tcx, ref_path, |ecx| { + let header: LazyValue = ecx.lazy(CrateHeader { + name: tcx.crate_name(LOCAL_CRATE), + triple: tcx.sess.opts.target_triple.clone(), + hash: tcx.crate_hash(LOCAL_CRATE), + is_proc_macro_crate: false, + is_stub: true, + }); + header.position.get() + }); + } +} + +fn with_encode_metadata_header( + tcx: TyCtxt<'_>, + path: &Path, + f: impl FnOnce(&mut EncodeContext<'_, '_>) -> usize, +) { let mut encoder = opaque::FileEncoder::new(path) .unwrap_or_else(|err| tcx.dcx().emit_fatal(FailCreateFileEncoder { err })); encoder.emit_raw_bytes(METADATA_HEADER); @@ -2326,9 +2384,7 @@ pub fn encode_metadata(tcx: TyCtxt<'_>, path: &Path) { // Encode the rustc version string in a predictable location. rustc_version(tcx.sess.cfg_version).encode(&mut ecx); - // Encode all the entries and extra information in the crate, - // culminating in the `CrateRoot` which points to all of it. - let root = ecx.encode_crate_root(); + let root_position = f(&mut ecx); // Make sure we report any errors from writing to the file. // If we forget this, compilation can succeed with an incomplete rmeta file, @@ -2338,12 +2394,9 @@ pub fn encode_metadata(tcx: TyCtxt<'_>, path: &Path) { } let file = ecx.opaque.file(); - if let Err(err) = encode_root_position(file, root.position.get()) { + if let Err(err) = encode_root_position(file, root_position) { tcx.dcx().emit_fatal(FailWriteFile { path: ecx.opaque.path(), err }); } - - // Record metadata size for self-profiling - tcx.prof.artifact_size("crate_metadata", "crate_metadata", file.metadata().unwrap().len()); } fn encode_root_position(mut file: &File, pos: usize) -> Result<(), std::io::Error> { diff --git a/compiler/rustc_metadata/src/rmeta/mod.rs b/compiler/rustc_metadata/src/rmeta/mod.rs index dc453b1e747ca..f4cf338ffb5d4 100644 --- a/compiler/rustc_metadata/src/rmeta/mod.rs +++ b/compiler/rustc_metadata/src/rmeta/mod.rs @@ -56,7 +56,7 @@ pub(crate) fn rustc_version(cfg_version: &'static str) -> String { /// Metadata encoding version. /// N.B., increment this if you change the format of metadata such that /// the rustc version can't be found to compare with `rustc_version()`. -const METADATA_VERSION: u8 = 9; +const METADATA_VERSION: u8 = 10; /// Metadata header which includes `METADATA_VERSION`. /// @@ -221,6 +221,12 @@ pub(crate) struct CrateHeader { /// This is separate from [`ProcMacroData`] to avoid having to update [`METADATA_VERSION`] every /// time ProcMacroData changes. pub(crate) is_proc_macro_crate: bool, + /// Whether this crate metadata section is just a stub. + /// Stubs do not contain the full metadata (it will be typically stored + /// in a separate rmeta file). + /// + /// This is used inside rlibs and dylibs when using `-Zembed-metadata=no`. + pub(crate) is_stub: bool, } /// Serialized `.rmeta` data for a crate. diff --git a/compiler/rustc_session/src/options.rs b/compiler/rustc_session/src/options.rs index 4cc666b3e37d2..cd5e2c4173e7b 100644 --- a/compiler/rustc_session/src/options.rs +++ b/compiler/rustc_session/src/options.rs @@ -2175,6 +2175,8 @@ options! { them only if an error has not been emitted"), ehcont_guard: bool = (false, parse_bool, [TRACKED], "generate Windows EHCont Guard tables"), + embed_metadata: bool = (true, parse_bool, [TRACKED], + "embed metadata in rlibs and dylibs (default: yes)"), embed_source: bool = (false, parse_bool, [TRACKED], "embed source text in DWARF debug sections (default: no)"), emit_stack_sizes: bool = (false, parse_bool, [UNTRACKED], diff --git a/src/doc/unstable-book/src/compiler-flags/embed-metadata.md b/src/doc/unstable-book/src/compiler-flags/embed-metadata.md new file mode 100644 index 0000000000000..a2a790ee76af3 --- /dev/null +++ b/src/doc/unstable-book/src/compiler-flags/embed-metadata.md @@ -0,0 +1,3 @@ +## `embed-metadata` + +This option instructs `rustc` to include the full metadata in `rlib` and `dylib` crate types. The default value is `yes` (enabled). If disabled (`no`), only stub metadata will be stored in these files, to reduce their size on disk. When using `-Zembed-metadata=no`, you will probably want to use `--emit=metadata` to produce the full metadata into a separate `.rmeta` file. diff --git a/src/tools/rust-analyzer/crates/proc-macro-srv/src/dylib/version.rs b/src/tools/rust-analyzer/crates/proc-macro-srv/src/dylib/version.rs index 4e28aaced9b0a..7668f419040cf 100644 --- a/src/tools/rust-analyzer/crates/proc-macro-srv/src/dylib/version.rs +++ b/src/tools/rust-analyzer/crates/proc-macro-srv/src/dylib/version.rs @@ -110,7 +110,7 @@ pub fn read_version(obj: &object::File<'_>) -> io::Result { )); } let version = u32::from_be_bytes([dot_rustc[4], dot_rustc[5], dot_rustc[6], dot_rustc[7]]); - // Last supported version is: + // Last breaking version change is: // https://github.com/rust-lang/rust/commit/b94cfefc860715fb2adf72a6955423d384c69318 let (mut metadata_portion, bytes_before_version) = match version { 8 => { @@ -118,7 +118,7 @@ pub fn read_version(obj: &object::File<'_>) -> io::Result { let data_len = u32::from_be_bytes(len_bytes.try_into().unwrap()) as usize; (&dot_rustc[12..data_len + 12], 13) } - 9 => { + 9 | 10 => { let len_bytes = &dot_rustc[8..16]; let data_len = u64::from_le_bytes(len_bytes.try_into().unwrap()) as usize; (&dot_rustc[16..data_len + 12], 17) diff --git a/tests/run-make/embed-metadata/dep1.rs b/tests/run-make/embed-metadata/dep1.rs new file mode 100644 index 0000000000000..be70c3933e098 --- /dev/null +++ b/tests/run-make/embed-metadata/dep1.rs @@ -0,0 +1 @@ +pub fn func_dep1() {} diff --git a/tests/run-make/embed-metadata/foo.rs b/tests/run-make/embed-metadata/foo.rs new file mode 100644 index 0000000000000..0cc9cede86082 --- /dev/null +++ b/tests/run-make/embed-metadata/foo.rs @@ -0,0 +1,5 @@ +extern crate dep1; + +fn main() { + dep1::func_dep1(); +} diff --git a/tests/run-make/embed-metadata/rmake.rs b/tests/run-make/embed-metadata/rmake.rs new file mode 100644 index 0000000000000..acefb18648440 --- /dev/null +++ b/tests/run-make/embed-metadata/rmake.rs @@ -0,0 +1,86 @@ +// Tests the -Zembed-metadata compiler flag. +// Tracking issue: https://github.com/rust-lang/rust/issues/139165 + +use run_make_support::rfs::{create_dir, remove_file, rename}; +use run_make_support::{Rustc, dynamic_lib_name, path, run_in_tmpdir, rust_lib_name, rustc}; + +#[derive(Debug, Copy, Clone)] +enum LibraryKind { + Rlib, + Dylib, +} + +impl LibraryKind { + fn crate_type(&self) -> &str { + match self { + LibraryKind::Rlib => "rlib", + LibraryKind::Dylib => "dylib", + } + } + + fn add_extern(&self, rustc: &mut Rustc, dep_name: &str, dep_path: &str) { + let dep_path = match self { + LibraryKind::Dylib => format!("{dep_path}/{}", dynamic_lib_name(dep_name)), + LibraryKind::Rlib => format!("{dep_path}/{}", rust_lib_name(dep_name)), + }; + rustc.extern_(dep_name, dep_path); + } +} + +fn main() { + // The compiler takes different paths based on if --extern is passed or not, so we test all + // combinations (`rlib`/`dylib` x `--extern`/`no --extern`). + for kind in [LibraryKind::Rlib, LibraryKind::Dylib] { + eprintln!("Testing library kind {kind:?}"); + lookup_rmeta_in_lib_dir(kind); + lookup_rmeta_through_extern(kind); + lookup_rmeta_missing(kind); + } +} + +// Lookup .rmeta file in the same directory as a rlib/dylib with stub metadata. +fn lookup_rmeta_in_lib_dir(kind: LibraryKind) { + run_in_tmpdir(|| { + build_dep_rustc(kind).run(); + rustc().input("foo.rs").run(); + }); +} + +// Lookup .rmeta file when specifying the dependency using --extern. +fn lookup_rmeta_through_extern(kind: LibraryKind) { + run_in_tmpdir(|| { + // Generate libdep1.rlib and libdep1.rmeta in deps + create_dir("deps"); + build_dep_rustc(kind).out_dir("deps").run(); + + let mut rustc = rustc(); + kind.add_extern(&mut rustc, "dep1", "deps"); + rustc.extern_("dep1", path("deps").join("libdep1.rmeta")); + rustc.input("foo.rs").run(); + }); +} + +// Check the error message when the .rmeta file is missing. +fn lookup_rmeta_missing(kind: LibraryKind) { + run_in_tmpdir(|| { + create_dir("deps"); + build_dep_rustc(kind).out_dir("deps").run(); + + let mut rustc = rustc(); + kind.add_extern(&mut rustc, "dep1", "deps"); + rustc.input("foo.rs").run_fail().assert_stderr_contains("only metadata stub found"); + }); +} + +fn build_dep_rustc(kind: LibraryKind) -> Rustc { + let mut dep_rustc = rustc(); + dep_rustc + .arg("-Zembed-metadata=no") + .crate_type(kind.crate_type()) + .input("dep1.rs") + .emit("metadata,link"); + if matches!(kind, LibraryKind::Dylib) { + dep_rustc.arg("-Cprefer-dynamic"); + } + dep_rustc +}