Fix --document-private-items for multiple targets.

src/bin/cargo/command_prelude.rs

@@ -315,6 +315,7 @@ pub trait ArgMatchesExt {
             ),
             target_rustdoc_args: None,
             target_rustc_args: None,
+            local_rustdoc_args: None,
             export_dir: None,
         };
         Ok(opts)

src/bin/cargo/commands/doc.rs

@@ -51,7 +51,7 @@ pub fn exec(config: &mut Config, args: &ArgMatches) -> CliResult {
         deps: !args.is_present("no-deps"),
     };
     let mut compile_opts = args.compile_options(config, mode)?;
-    compile_opts.target_rustdoc_args = if args.is_present("document-private-items") {
+    compile_opts.local_rustdoc_args = if args.is_present("document-private-items") {
         Some(vec!["--document-private-items".to_string()])
     } else {
         None

src/cargo/core/compiler/build_context/mod.rs

@@ -24,12 +24,8 @@ pub struct BuildContext<'a, 'cfg: 'a> {
     pub resolve: &'a Resolve,
     pub profiles: &'a Profiles,
     pub build_config: &'a BuildConfig,
-    /// This is a workaround to carry the extra compiler args for either
-    /// `rustc` or `rustdoc` given on the command-line for the commands `cargo
-    /// rustc` and `cargo rustdoc`.  These commands only support one target,
-    /// but we don't want the args passed to any dependencies, so we include
-    /// the `Unit` corresponding to the top-level target.
-    pub extra_compiler_args: Option<(Unit<'a>, Vec<String>)>,
+    /// Extra compiler args for either `rustc` or `rustdoc`.
+    pub extra_compiler_args: HashMap<Unit<'a>, Vec<String>>,
     pub packages: &'a PackageSet<'cfg>,
 
     /// Information about the compiler
@@ -51,7 +47,7 @@ impl<'a, 'cfg> BuildContext<'a, 'cfg> {
         config: &'cfg Config,
         build_config: &'a BuildConfig,
         profiles: &'a Profiles,
-        extra_compiler_args: Option<(Unit<'a>, Vec<String>)>,
+        extra_compiler_args: HashMap<Unit<'a>, Vec<String>>,
     ) -> CargoResult<BuildContext<'a, 'cfg>> {
         let incremental_env = match env::var("CARGO_INCREMENTAL") {
             Ok(v) => Some(v == "1"),
@@ -200,12 +196,7 @@ impl<'a, 'cfg> BuildContext<'a, 'cfg> {
     }
 
     pub fn extra_args_for(&self, unit: &Unit<'a>) -> Option<&Vec<String>> {
-        if let Some((ref args_unit, ref args)) = self.extra_compiler_args {
-            if args_unit == unit {
-                return Some(args);
-            }
-        }
-        None
+        self.extra_compiler_args.get(unit)
     }
 
     /// Return the list of filenames read by cargo to generate the BuildContext

src/cargo/ops/cargo_clean.rs

@@ -1,3 +1,4 @@
+use std::collections::HashMap;
 use std::fs;
 use std::path::Path;
 
@@ -97,7 +98,7 @@ pub fn clean(ws: &Workspace, opts: &CleanOptions) -> CargoResult<()> {
         opts.config,
         &build_config,
         profiles,
-        None,
+        HashMap::new(),
     )?;
     let mut cx = Context::new(config, &bcx)?;
     cx.prepare_units(None, &units)?;

src/cargo/ops/cargo_compile.rs

@@ -53,11 +53,13 @@ pub struct CompileOptions<'a> {
     /// Filter to apply to the root package to select which targets will be
     /// built.
     pub filter: CompileFilter,
-    /// Extra arguments to be passed to rustdoc (for main crate and dependencies)
+    /// Extra arguments to be passed to rustdoc (single target only)
     pub target_rustdoc_args: Option<Vec<String>>,
     /// The specified target will be compiled with all the available arguments,
     /// note that this only accounts for the *final* invocation of rustc
     pub target_rustc_args: Option<Vec<String>>,
+    /// Extra arguments passed to all selected targets for rustdoc.
+    pub local_rustdoc_args: Option<Vec<String>>,
     /// The directory to copy final artifacts to. Note that even if `out_dir` is
     /// set, a copy of artifacts still could be found a `target/(debug\release)`
     /// as usual.
@@ -80,6 +82,7 @@ impl<'a> CompileOptions<'a> {
             },
             target_rustdoc_args: None,
             target_rustc_args: None,
+            local_rustdoc_args: None,
             export_dir: None,
         })
     }
@@ -219,6 +222,7 @@ pub fn compile_ws<'a>(
         ref filter,
         ref target_rustdoc_args,
         ref target_rustc_args,
+        ref local_rustdoc_args,
         ref export_dir,
     } = *options;
 
@@ -265,8 +269,6 @@ pub fn compile_ws<'a>(
     let profiles = ws.profiles();
     profiles.validate_packages(&mut config.shell(), &packages)?;
 
-    let mut extra_compiler_args = None;
-
     let units = generate_targets(
         ws,
         profiles,
@@ -277,6 +279,7 @@ pub fn compile_ws<'a>(
         build_config,
     )?;
 
+    let mut extra_compiler_args = HashMap::new();
     if let Some(args) = extra_args {
         if units.len() != 1 {
             bail!(
@@ -286,7 +289,14 @@ pub fn compile_ws<'a>(
                 extra_args_name
             );
         }
-        extra_compiler_args = Some((units[0], args));
+        extra_compiler_args.insert(units[0], args);
+    }
+    if let Some(args) = local_rustdoc_args {
+        for unit in &units {
+            if unit.mode.is_doc() {
+                extra_compiler_args.insert(*unit, args.clone());
+            }
+        }
     }
 
     let ret = {

src/cargo/ops/cargo_package.rs

@@ -444,6 +444,7 @@ fn run_verify(ws: &Workspace, tar: &FileLock, opts: &PackageOpts) -> CargoResult
             },
             target_rustdoc_args: None,
             target_rustc_args: None,
+            local_rustdoc_args: None,
             export_dir: None,
         },
         &exec,

tests/testsuite/doc.rs

@@ -1206,6 +1206,31 @@ fn doc_private_items() {
     );
 }
 
+#[test]
+fn doc_private_ws() {
+    let p = project()
+        .file(
+            "Cargo.toml",
+            r#"
+            [workspace]
+            members = ["a", "b"]
+        "#,
+        ).file("a/Cargo.toml", &basic_manifest("a", "0.0.1"))
+        .file("a/src/lib.rs", "fn p() {}")
+        .file("b/Cargo.toml", &basic_manifest("b", "0.0.1"))
+        .file("b/src/lib.rs", "fn p2() {}")
+        .file("b/src/main.rs", "fn main() {}")
+        .build();
+    p.cargo("doc --all --bins --lib --document-private-items -v")
+        .with_stderr_contains(
+            "[RUNNING] `rustdoc [..] a/src/lib.rs [..]--document-private-items[..]",
+        ).with_stderr_contains(
+            "[RUNNING] `rustdoc [..] b/src/lib.rs [..]--document-private-items[..]",
+        ).with_stderr_contains(
+            "[RUNNING] `rustdoc [..] b/src/main.rs [..]--document-private-items[..]",
+        ).run();
+}
+
 const BAD_INTRA_LINK_LIB: &str = r#"
 #![deny(intra_doc_link_resolution_failure)]