Add --crate-type metadata

With the same semantics as -Zno-trans

Author: Nick Cameron

src/librustc/middle/dependency_format.rs

@@ -114,7 +114,7 @@ fn calculate_type(sess: &session::Session,
 
         // No linkage happens with rlibs, we just needed the metadata (which we
         // got long ago), so don't bother with anything.
-        config::CrateTypeRlib => return Vec::new(),
+        config::CrateTypeRlib | config::CrateTypeMetadata => return Vec::new(),
 
         // Staticlibs and cdylibs must have all static dependencies. If any fail
         // to be found, we generate some nice pretty errors.

src/librustc/middle/reachable.rs

@@ -140,7 +140,7 @@ impl<'a, 'tcx> ReachableContext<'a, 'tcx> {
     fn new(tcx: TyCtxt<'a, 'tcx, 'tcx>) -> ReachableContext<'a, 'tcx> {
         let any_library = tcx.sess.crate_types.borrow().iter().any(|ty| {
             *ty == config::CrateTypeRlib || *ty == config::CrateTypeDylib ||
-            *ty == config::CrateTypeProcMacro
+            *ty == config::CrateTypeProcMacro || *ty == config::CrateTypeMetadata
         });
         ReachableContext {
             tcx: tcx,

src/librustc/middle/weak_lang_items.rs

@@ -75,7 +75,8 @@ fn verify(sess: &Session, items: &lang_items::LanguageItems) {
             config::CrateTypeCdylib |
             config::CrateTypeExecutable |
             config::CrateTypeStaticlib => true,
-            config::CrateTypeRlib => false,
+            config::CrateTypeRlib |
+            config::CrateTypeMetadata => false,
         }
     });
     if !needs_check {

src/librustc/session/config.rs

@@ -78,18 +78,6 @@ pub enum OutputType {
     DepInfo,
 }
 
-#[derive(Clone, Copy, Debug, PartialEq, Eq)]
-pub enum ErrorOutputType {
-    HumanReadable(ColorConfig),
-    Json,
-}
-
-impl Default for ErrorOutputType {
-    fn default() -> ErrorOutputType {
-        ErrorOutputType::HumanReadable(ColorConfig::Auto)
-    }
-}
-
 impl OutputType {
     fn is_compatible_with_codegen_units_and_single_output_file(&self) -> bool {
         match *self {
@@ -125,6 +113,18 @@ impl OutputType {
     }
 }
 
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum ErrorOutputType {
+    HumanReadable(ColorConfig),
+    Json,
+}
+
+impl Default for ErrorOutputType {
+    fn default() -> ErrorOutputType {
+        ErrorOutputType::HumanReadable(ColorConfig::Auto)
+    }
+}
+
 // Use tree-based collections to cheaply get a deterministic Hash implementation.
 // DO NOT switch BTreeMap out for an unsorted container type! That would break
 // dependency tracking for commandline arguments.
@@ -483,6 +483,7 @@ pub enum CrateType {
     CrateTypeStaticlib,
     CrateTypeCdylib,
     CrateTypeProcMacro,
+    CrateTypeMetadata,
 }
 
 #[derive(Clone, Hash)]
@@ -1159,7 +1160,7 @@ pub fn rustc_short_optgroups() -> Vec<RustcOptGroup> {
                              assumed.", "[KIND=]NAME"),
         opt::multi_s("", "crate-type", "Comma separated list of types of crates
                                     for the compiler to emit",
-                   "[bin|lib|rlib|dylib|cdylib|staticlib]"),
+                   "[bin|lib|rlib|dylib|cdylib|staticlib|metadata]"),
         opt::opt_s("", "crate-name", "Specify the name of the crate being built",
                "NAME"),
         opt::multi_s("", "emit", "Comma separated list of types of output for \
@@ -1548,6 +1549,7 @@ pub fn parse_crate_types_from_list(list_list: Vec<String>) -> Result<Vec<CrateTy
                 "cdylib"    => CrateTypeCdylib,
                 "bin"       => CrateTypeExecutable,
                 "proc-macro" => CrateTypeProcMacro,
+                "metadata"  => CrateTypeMetadata,
                 _ => {
                     return Err(format!("unknown crate type: `{}`",
                                        part));
@@ -1632,6 +1634,7 @@ impl fmt::Display for CrateType {
             CrateTypeStaticlib => "staticlib".fmt(f),
             CrateTypeCdylib => "cdylib".fmt(f),
             CrateTypeProcMacro => "proc-macro".fmt(f),
+            CrateTypeMetadata => "rmeta".fmt(f),
         }
     }
 }

src/librustc_driver/driver.rs

@@ -1093,6 +1093,7 @@ pub fn phase_5_run_llvm_passes(sess: &Session,
          "serialize work products",
          move || rustc_incremental::save_work_products(sess));
 
+    println!("finish phase 5: {}", sess.err_count());
     if sess.err_count() > 0 {
         Err(sess.err_count())
     } else {

src/librustc_metadata/creader.rs

@@ -767,7 +767,8 @@ impl<'a> CrateLoader<'a> {
                 config::CrateTypeProcMacro |
                 config::CrateTypeCdylib |
                 config::CrateTypeStaticlib => need_lib_alloc = true,
-                config::CrateTypeRlib => {}
+                config::CrateTypeRlib |
+                config::CrateTypeMetadata => {}
             }
         }
         if !need_lib_alloc && !need_exe_alloc { return }

src/librustc_trans/back/archive.rs

@@ -231,7 +231,7 @@ impl<'a> ArchiveBuilder<'a> {
     }
 
     fn llvm_archive_kind(&self) -> Result<ArchiveKind, &str> {
-        let kind = &self.config.sess.target.target.options.archive_format[..];
+        let kind = &*self.config.sess.target.target.options.archive_format;
         kind.parse().map_err(|_| kind)
     }
 

src/librustc_trans/back/link.rs

@@ -191,6 +191,7 @@ pub fn link_binary(sess: &Session,
     let mut out_filenames = Vec::new();
     for &crate_type in sess.crate_types.borrow().iter() {
         // Ignore executable crates if we have -Z no-trans, as they will error.
+        // TODO do we need to check for CrateTypeMetadata here?
         if sess.opts.debugging_opts.no_trans &&
            crate_type == config::CrateTypeExecutable {
             continue;
@@ -263,6 +264,9 @@ pub fn filename_for_input(sess: &Session,
         config::CrateTypeRlib => {
             outputs.out_directory.join(&format!("lib{}.rlib", libname))
         }
+        config::CrateTypeMetadata => {
+            outputs.out_directory.join(&format!("lib{}.rmeta", libname))
+        }
         config::CrateTypeCdylib |
         config::CrateTypeProcMacro |
         config::CrateTypeDylib => {
@@ -322,6 +326,7 @@ fn link_binary_output(sess: &Session,
                       outputs: &OutputFilenames,
                       crate_name: &str) -> PathBuf {
     let objects = object_filenames(trans, outputs);
+    println!("objects: {:?}", objects);
     let default_filename = filename_for_input(sess, crate_type, crate_name,
                                               outputs);
     let out_filename = outputs.outputs.get(&OutputType::Exe)
@@ -345,7 +350,7 @@ fn link_binary_output(sess: &Session,
     };
 
     match crate_type {
-        config::CrateTypeRlib => {
+        config::CrateTypeRlib | config::CrateTypeMetadata => {
             link_rlib(sess, Some(trans), &objects, &out_filename,
                       tmpdir.path()).build();
         }
@@ -403,6 +408,7 @@ fn link_rlib<'a>(sess: &'a Session,
                  tmpdir: &Path) -> ArchiveBuilder<'a> {
     info!("preparing rlib from {:?} to {:?}", objects, out_filename);
     let mut ab = ArchiveBuilder::new(archive_config(sess, out_filename, None));
+
     for obj in objects {
         ab.add_file(obj);
     }

src/librustc_trans/back/write.rs

@@ -691,10 +691,12 @@ pub fn run_passes(sess: &Session,
     // Whenever an rlib is created, the bitcode is inserted into the
     // archive in order to allow LTO against it.
     let needs_crate_bitcode =
-            sess.crate_types.borrow().contains(&config::CrateTypeRlib) &&
-            sess.opts.output_types.contains_key(&OutputType::Exe);
+            (sess.crate_types.borrow().contains(&config::CrateTypeRlib) &&
+             sess.opts.output_types.contains_key(&OutputType::Exe)) ||
+            sess.crate_types.borrow().contains(&config::CrateTypeMetadata);
     let needs_crate_object =
-            sess.opts.output_types.contains_key(&OutputType::Exe);
+            sess.opts.output_types.contains_key(&OutputType::Exe) ||
+            sess.crate_types.borrow().contains(&config::CrateTypeMetadata);
     if needs_crate_bitcode {
         modules_config.emit_bc = true;
     }

src/librustc_trans/base.rs

@@ -45,7 +45,7 @@ use rustc::ty::adjustment::CustomCoerceUnsized;
 use rustc::dep_graph::{DepNode, WorkProduct};
 use rustc::hir::map as hir_map;
 use rustc::util::common::time;
-use session::config::{self, NoDebugInfo};
+use session::config::{self, NoDebugInfo, OutputType};
 use rustc_incremental::IncrementalHashesMap;
 use session::Session;
 use abi::{self, Abi, FnType};
@@ -1260,7 +1260,8 @@ fn write_metadata(cx: &SharedCrateContext,
             config::CrateTypeStaticlib |
             config::CrateTypeCdylib => MetadataKind::None,
 
-            config::CrateTypeRlib => MetadataKind::Uncompressed,
+            config::CrateTypeRlib |
+            config::CrateTypeMetadata => MetadataKind::Uncompressed,
 
             config::CrateTypeDylib |
             config::CrateTypeProcMacro => MetadataKind::Compressed,
@@ -1600,7 +1601,8 @@ pub fn trans_crate<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
     assert_module_sources::assert_module_sources(tcx, &modules);
 
     // Skip crate items and just output metadata in -Z no-trans mode.
-    if tcx.sess.opts.debugging_opts.no_trans {
+    if tcx.sess.opts.debugging_opts.no_trans ||
+       tcx.sess.crate_types.borrow().iter().all(|ct| ct == &config::CrateTypeMetadata) {
         let linker_info = LinkerInfo::new(&shared_ccx, &[]);
         return CrateTranslation {
             modules: modules,