diff options
Diffstat (limited to 'compiler/rustc_codegen_ssa/src/back/link.rs')
| -rw-r--r-- | compiler/rustc_codegen_ssa/src/back/link.rs | 181 |
1 files changed, 102 insertions, 79 deletions
diff --git a/compiler/rustc_codegen_ssa/src/back/link.rs b/compiler/rustc_codegen_ssa/src/back/link.rs index edde1537b81..8ca7103ed48 100644 --- a/compiler/rustc_codegen_ssa/src/back/link.rs +++ b/compiler/rustc_codegen_ssa/src/back/link.rs @@ -11,7 +11,7 @@ use rustc_metadata::find_native_static_library; use rustc_metadata::fs::{emit_wrapper_file, METADATA_FILENAME}; use rustc_middle::middle::dependency_format::Linkage; use rustc_middle::middle::exported_symbols::SymbolExportKind; -use rustc_session::config::{self, CFGuard, CrateType, DebugInfo, LdImpl, Lto, Strip}; +use rustc_session::config::{self, CFGuard, CrateType, DebugInfo, LdImpl, Strip}; use rustc_session::config::{OutputFilenames, OutputType, PrintRequest, SplitDwarfKind}; use rustc_session::cstore::DllImport; use rustc_session::output::{check_file_is_writeable, invalid_output_for_target, out_filename}; @@ -208,16 +208,16 @@ pub fn link_binary<'a>( Ok(()) } +// Crate type is not passed when calculating the dylibs to include for LTO. In that case all +// crate types must use the same dependency formats. pub fn each_linked_rlib( - sess: &Session, info: &CrateInfo, + crate_type: Option<CrateType>, f: &mut dyn FnMut(CrateNum, &Path), ) -> Result<(), errors::LinkRlibError> { let crates = info.used_crates.iter(); - let mut fmts = None; - let lto_active = matches!(sess.lto(), Lto::Fat | Lto::Thin); - if lto_active { + let fmts = if crate_type.is_none() { for combination in info.dependency_formats.iter().combinations(2) { let (ty1, list1) = &combination[0]; let (ty2, list2) = &combination[1]; @@ -230,27 +230,23 @@ pub fn each_linked_rlib( }); } } - } - - for (ty, list) in info.dependency_formats.iter() { - match ty { - CrateType::Executable - | CrateType::Staticlib - | CrateType::Cdylib - | CrateType::ProcMacro => { - fmts = Some(list); - break; - } - CrateType::Dylib if lto_active => { - fmts = Some(list); - break; - } - _ => {} + if info.dependency_formats.is_empty() { + return Err(errors::LinkRlibError::MissingFormat); } - } - let Some(fmts) = fmts else { - return Err(errors::LinkRlibError::MissingFormat); + &info.dependency_formats[0].1 + } else { + let fmts = info + .dependency_formats + .iter() + .find_map(|&(ty, ref list)| if Some(ty) == crate_type { Some(list) } else { None }); + + let Some(fmts) = fmts else { + return Err(errors::LinkRlibError::MissingFormat); + }; + + fmts }; + for &cnum in crates { match fmts.get(cnum.as_usize() - 1) { Some(&Linkage::NotLinked | &Linkage::Dynamic | &Linkage::IncludedFromDylib) => continue, @@ -516,64 +512,71 @@ fn link_staticlib<'a>( )?; let mut all_native_libs = vec![]; - let res = each_linked_rlib(sess, &codegen_results.crate_info, &mut |cnum, path| { - let name = codegen_results.crate_info.crate_name[&cnum]; - let native_libs = &codegen_results.crate_info.native_libraries[&cnum]; - - // Here when we include the rlib into our staticlib we need to make a - // decision whether to include the extra object files along the way. - // These extra object files come from statically included native - // libraries, but they may be cfg'd away with #[link(cfg(..))]. - // - // This unstable feature, though, only needs liblibc to work. The only - // use case there is where musl is statically included in liblibc.rlib, - // so if we don't want the included version we just need to skip it. As - // a result the logic here is that if *any* linked library is cfg'd away - // we just skip all object files. - // - // Clearly this is not sufficient for a general purpose feature, and - // we'd want to read from the library's metadata to determine which - // object files come from where and selectively skip them. - let skip_object_files = native_libs.iter().any(|lib| { - matches!(lib.kind, NativeLibKind::Static { bundle: None | Some(true), .. }) - && !relevant_lib(sess, lib) - }); + let res = each_linked_rlib( + &codegen_results.crate_info, + Some(CrateType::Staticlib), + &mut |cnum, path| { + let name = codegen_results.crate_info.crate_name[&cnum]; + let native_libs = &codegen_results.crate_info.native_libraries[&cnum]; + + // Here when we include the rlib into our staticlib we need to make a + // decision whether to include the extra object files along the way. + // These extra object files come from statically included native + // libraries, but they may be cfg'd away with #[link(cfg(..))]. + // + // This unstable feature, though, only needs liblibc to work. The only + // use case there is where musl is statically included in liblibc.rlib, + // so if we don't want the included version we just need to skip it. As + // a result the logic here is that if *any* linked library is cfg'd away + // we just skip all object files. + // + // Clearly this is not sufficient for a general purpose feature, and + // we'd want to read from the library's metadata to determine which + // object files come from where and selectively skip them. + let skip_object_files = native_libs.iter().any(|lib| { + matches!(lib.kind, NativeLibKind::Static { bundle: None | Some(true), .. }) + && !relevant_lib(sess, lib) + }); - let lto = are_upstream_rust_objects_already_included(sess) - && !ignored_for_lto(sess, &codegen_results.crate_info, cnum); + let lto = are_upstream_rust_objects_already_included(sess) + && !ignored_for_lto(sess, &codegen_results.crate_info, cnum); - // Ignoring obj file starting with the crate name - // as simple comparison is not enough - there - // might be also an extra name suffix - let obj_start = name.as_str().to_owned(); + // Ignoring obj file starting with the crate name + // as simple comparison is not enough - there + // might be also an extra name suffix + let obj_start = name.as_str().to_owned(); - ab.add_archive( - path, - Box::new(move |fname: &str| { - // Ignore metadata files, no matter the name. - if fname == METADATA_FILENAME { - return true; - } + ab.add_archive( + path, + Box::new(move |fname: &str| { + // Ignore metadata files, no matter the name. + if fname == METADATA_FILENAME { + return true; + } - // Don't include Rust objects if LTO is enabled - if lto && looks_like_rust_object_file(fname) { - return true; - } + // Don't include Rust objects if LTO is enabled + if lto && looks_like_rust_object_file(fname) { + return true; + } - // Otherwise if this is *not* a rust object and we're skipping - // objects then skip this file - if skip_object_files && (!fname.starts_with(&obj_start) || !fname.ends_with(".o")) { - return true; - } + // Otherwise if this is *not* a rust object and we're skipping + // objects then skip this file + if skip_object_files + && (!fname.starts_with(&obj_start) || !fname.ends_with(".o")) + { + return true; + } - // ok, don't skip this - false - }), - ) - .unwrap(); + // ok, don't skip this + false + }), + ) + .unwrap(); - all_native_libs.extend(codegen_results.crate_info.native_libraries[&cnum].iter().cloned()); - }); + all_native_libs + .extend(codegen_results.crate_info.native_libraries[&cnum].iter().cloned()); + }, + ); if let Err(e) = res { sess.emit_fatal(e); } @@ -1354,7 +1357,8 @@ fn print_native_static_libs(sess: &Session, all_native_libs: &[NativeLib]) { if !lib_args.is_empty() { sess.emit_note(errors::StaticLibraryNativeArtifacts); // Prefix for greppability - sess.emit_note(errors::NativeStaticLibs { arguments: lib_args.join(" ") }); + // Note: This must not be translated as tools are allowed to depend on this exact string. + sess.note_without_error(&format!("native-static-libs: {}", &lib_args.join(" "))); } } @@ -2612,7 +2616,7 @@ fn add_static_crate<'a>( sess.target.no_builtins || !codegen_results.crate_info.is_no_builtins.contains(&cnum); let mut archive = archive_builder_builder.new_archive_builder(sess); - if let Err(e) = archive.add_archive( + if let Err(error) = archive.add_archive( cratepath, Box::new(move |f| { if f == METADATA_FILENAME { @@ -2652,7 +2656,7 @@ fn add_static_crate<'a>( false }), ) { - sess.fatal(&format!("failed to build archive from rlib: {}", e)); + sess.emit_fatal(errors::RlibArchiveBuildFailure { error }); } if archive.build(&dst) { link_upstream(&dst); @@ -2822,11 +2826,30 @@ fn add_gcc_ld_path(cmd: &mut dyn Linker, sess: &Session, flavor: LinkerFlavor) { // Implement the "linker flavor" part of -Zgcc-ld // by asking cc to use some kind of lld. cmd.arg("-fuse-ld=lld"); + if !flavor.is_gnu() { // Tell clang to use a non-default LLD flavor. // Gcc doesn't understand the target option, but we currently assume // that gcc is not used for Apple and Wasm targets (#97402). - cmd.arg(format!("--target={}", sess.target.llvm_target)); + // + // Note that we don't want to do that by default on macOS: e.g. passing a + // 10.7 target to LLVM works, but not to recent versions of clang/macOS, as + // shown in issue #101653 and the discussion in PR #101792. + // + // It could be required in some cases of cross-compiling with + // `-Zgcc-ld=lld`, but this is generally unspecified, and we don't know + // which specific versions of clang, macOS SDK, host and target OS + // combinations impact us here. + // + // So we do a simple first-approximation until we know more of what the + // Apple targets require (and which would be handled prior to hitting this + // `-Zgcc-ld=lld` codepath anyway), but the expectation is that until then + // this should be manually passed if needed. We specify the target when + // targeting a different linker flavor on macOS, and that's also always + // the case when targeting WASM. + if sess.target.linker_flavor != sess.host.linker_flavor { + cmd.arg(format!("--target={}", sess.target.llvm_target)); + } } } } |