Added the --temps-dir option.

compiler/rustc_driver/src/lib.rs

@@ -215,6 +215,7 @@ fn run_compiler(
 
     let cfg = interface::parse_cfgspecs(matches.opt_strs("cfg"));
     let (odir, ofile) = make_output(&matches);
+    let temps_dir = make_temps_dir(&matches);
     let mut config = interface::Config {
         opts: sopts,
         crate_cfg: cfg,
@@ -222,6 +223,7 @@ fn run_compiler(
         input_path: None,
         output_file: ofile,
         output_dir: odir,
+        temps_dir,
         file_loader,
         diagnostic_output,
         stderr: None,
@@ -267,6 +269,7 @@ fn run_compiler(
                         None,
                         compiler.output_dir(),
                         compiler.output_file(),
+                        compiler.temps_dir(),
                     );
 
                     if should_stop == Compilation::Stop {
@@ -295,6 +298,7 @@ fn run_compiler(
             Some(compiler.input()),
             compiler.output_dir(),
             compiler.output_file(),
+            compiler.temps_dir(),
         )
         .and_then(|| {
             RustcDefaultCalls::list_metadata(
@@ -454,6 +458,11 @@ fn make_output(matches: &getopts::Matches) -> (Option<PathBuf>, Option<PathBuf>)
     (odir, ofile)
 }
 
+// Extract temporary directory from matches.
+fn make_temps_dir(matches: &getopts::Matches) -> Option<PathBuf> {
+    matches.opt_str("temps-dir").map(|o| PathBuf::from(&o))
+}
+
 // Extract input (string or file and optional path) from matches.
 fn make_input(
     error_format: ErrorOutputType,
@@ -647,6 +656,7 @@ impl RustcDefaultCalls {
         input: Option<&Input>,
         odir: &Option<PathBuf>,
         ofile: &Option<PathBuf>,
+        temps_dir: &Option<PathBuf>,
     ) -> Compilation {
         use rustc_session::config::PrintRequest::*;
         // PrintRequest::NativeStaticLibs is special - printed during linking
@@ -685,7 +695,7 @@ impl RustcDefaultCalls {
                     });
                     let attrs = attrs.as_ref().unwrap();
                     let t_outputs = rustc_interface::util::build_output_filenames(
-                        input, odir, ofile, attrs, sess,
+                        input, odir, ofile, temps_dir, attrs, sess,
                     );
                     let id = rustc_session::output::find_crate_name(sess, attrs, input);
                     if *req == PrintRequest::CrateName {

compiler/rustc_interface/src/interface.rs

@@ -36,6 +36,7 @@ pub struct Compiler {
     pub(crate) input_path: Option<PathBuf>,
     pub(crate) output_dir: Option<PathBuf>,
     pub(crate) output_file: Option<PathBuf>,
+    pub(crate) temps_dir: Option<PathBuf>,
     pub(crate) register_lints: Option<Box<dyn Fn(&Session, &mut LintStore) + Send + Sync>>,
     pub(crate) override_queries:
         Option<fn(&Session, &mut ty::query::Providers, &mut ty::query::ExternProviders)>,
@@ -57,6 +58,9 @@ impl Compiler {
     pub fn output_file(&self) -> &Option<PathBuf> {
         &self.output_file
     }
+    pub fn temps_dir(&self) -> &Option<PathBuf> {
+        &self.temps_dir
+    }
     pub fn register_lints(&self) -> &Option<Box<dyn Fn(&Session, &mut LintStore) + Send + Sync>> {
         &self.register_lints
     }
@@ -65,7 +69,14 @@ impl Compiler {
         sess: &Session,
         attrs: &[ast::Attribute],
     ) -> OutputFilenames {
-        util::build_output_filenames(&self.input, &self.output_dir, &self.output_file, attrs, sess)
+        util::build_output_filenames(
+            &self.input,
+            &self.output_dir,
+            &self.output_file,
+            &self.temps_dir,
+            attrs,
+            sess,
+        )
     }
 }
 
@@ -132,6 +143,7 @@ pub struct Config {
     pub input_path: Option<PathBuf>,
     pub output_dir: Option<PathBuf>,
     pub output_file: Option<PathBuf>,
+    pub temps_dir: Option<PathBuf>,
     pub file_loader: Option<Box<dyn FileLoader + Send + Sync>>,
     pub diagnostic_output: DiagnosticOutput,
 
@@ -193,6 +205,7 @@ pub fn create_compiler_and_run<R>(config: Config, f: impl FnOnce(&Compiler) -> R
         input_path: config.input_path,
         output_dir: config.output_dir,
         output_file: config.output_file,
+        temps_dir: config.temps_dir,
         register_lints: config.register_lints,
         override_queries: config.override_queries,
     };

compiler/rustc_interface/src/passes.rs

@@ -692,6 +692,7 @@ pub fn prepare_outputs(
         &compiler.input,
         &compiler.output_dir,
         &compiler.output_file,
+        &compiler.temps_dir,
         &krate.attrs,
         sess,
     );
@@ -734,6 +735,12 @@ pub fn prepare_outputs(
                 return Err(ErrorReported);
             }
         }
+        if let Some(ref dir) = compiler.temps_dir {
+            if fs::create_dir_all(dir).is_err() {
+                sess.err("failed to find or create the directory specified by `--temps-dir`");
+                return Err(ErrorReported);
+            }
+        }
     }
 
     Ok(outputs)

compiler/rustc_interface/src/util.rs

@@ -604,6 +604,7 @@ pub fn build_output_filenames(
     input: &Input,
     odir: &Option<PathBuf>,
     ofile: &Option<PathBuf>,
+    temps_dir: &Option<PathBuf>,
     attrs: &[ast::Attribute],
     sess: &Session,
 ) -> OutputFilenames {
@@ -626,6 +627,7 @@ pub fn build_output_filenames(
                 dirpath,
                 stem,
                 None,
+                temps_dir.clone(),
                 sess.opts.cg.extra_filename.clone(),
                 sess.opts.output_types.clone(),
             )
@@ -654,6 +656,7 @@ pub fn build_output_filenames(
                 out_file.parent().unwrap_or_else(|| Path::new("")).to_path_buf(),
                 out_file.file_stem().unwrap_or_default().to_str().unwrap().to_string(),
                 ofile,
+                temps_dir.clone(),
                 sess.opts.cg.extra_filename.clone(),
                 sess.opts.output_types.clone(),
             )

compiler/rustc_session/src/config.rs

@@ -578,6 +578,7 @@ pub struct OutputFilenames {
     pub out_directory: PathBuf,
     filestem: String,
     pub single_output_file: Option<PathBuf>,
+    pub temps_directory: Option<PathBuf>,
     pub outputs: OutputTypes,
 }
 
@@ -592,12 +593,14 @@ impl OutputFilenames {
         out_directory: PathBuf,
         out_filestem: String,
         single_output_file: Option<PathBuf>,
+        temps_directory: Option<PathBuf>,
         extra: String,
         outputs: OutputTypes,
     ) -> Self {
         OutputFilenames {
             out_directory,
             single_output_file,
+            temps_directory,
             outputs,
             filestem: format!("{}{}", out_filestem, extra),
         }
@@ -643,11 +646,17 @@ impl OutputFilenames {
             extension.push_str(ext);
         }
 
-        self.with_extension(&extension)
+        let temps_directory = self.temps_directory.as_ref().unwrap_or(&self.out_directory);
+
+        self.with_directory_and_extension(&temps_directory, &extension)
     }
 
     pub fn with_extension(&self, extension: &str) -> PathBuf {
-        let mut path = self.out_directory.join(&self.filestem);
+        self.with_directory_and_extension(&self.out_directory, extension)
+    }
+
+    fn with_directory_and_extension(&self, directory: &PathBuf, extension: &str) -> PathBuf {
+        let mut path = directory.join(&self.filestem);
         path.set_extension(extension);
         path
     }
@@ -1094,6 +1103,7 @@ pub fn rustc_short_optgroups() -> Vec<RustcOptGroup> {
              in <dir>",
             "DIR",
         ),
+        opt::opt_s("", "temps-dir", "Write temporary output files to <dir>", "DIR"),
         opt::opt_s(
             "",
             "explain",

src/librustdoc/core.rs

@@ -259,6 +259,7 @@ crate fn create_config(
         input_path: cpath,
         output_file: None,
         output_dir: None,
+        temps_dir: None,
         file_loader: None,
         diagnostic_output: DiagnosticOutput::Default,
         stderr: None,

src/librustdoc/doctest.rs

@@ -94,6 +94,7 @@ crate fn run(options: Options) -> Result<(), ErrorReported> {
         input_path: None,
         output_file: None,
         output_dir: None,
+        temps_dir: None,
         file_loader: None,
         diagnostic_output: DiagnosticOutput::Default,
         stderr: None,