Auto merge of #64510 - Centril:rollup-m03zsq8, r=Centril

Rollup of 10 pull requests

Successful merges:

 - #63955 (Make sure interned constants are immutable)
 - #64028 (Stabilize `Vec::new` and `String::new` as `const fn`s)
 - #64119 (ci: ensure all tool maintainers are assignable on issues)
 - #64444 (fix building libstd without backtrace feature)
 - #64446 (Fix build script sanitizer check.)
 - #64451 (when Miri tests are not passing, do not add Miri component)
 - #64467 (Hide diagnostics emitted during --cfg parsing)
 - #64497 (Don't print the "total" `-Ztime-passes` output if `--prints=...` is also given)
 - #64499 (Use `Symbol` in two more functions.)
 - #64504 (use println!() instead of println!(""))

Failed merges:

r? @ghost

Cargo.lock

@@ -201,7 +201,9 @@ dependencies = [
 name = "build-manifest"
 version = "0.1.0"
 dependencies = [
+ "reqwest",
  "serde",
+ "serde_json",
  "toml",
 ]
 

src/bootstrap/dist.rs

@@ -2000,6 +2000,8 @@ impl Step for HashSign {
     }
 
     fn run(self, builder: &Builder<'_>) {
+        // This gets called by `promote-release`
+        // (https://github.com/rust-lang/rust-central-station/tree/master/promote-release).
         let mut cmd = builder.tool_cmd(Tool::BuildManifest);
         if builder.config.dry_run {
             return;
@@ -2010,10 +2012,14 @@ impl Step for HashSign {
         let addr = builder.config.dist_upload_addr.as_ref().unwrap_or_else(|| {
             panic!("\n\nfailed to specify `dist.upload-addr` in `config.toml`\n\n")
         });
-        let file = builder.config.dist_gpg_password_file.as_ref().unwrap_or_else(|| {
-            panic!("\n\nfailed to specify `dist.gpg-password-file` in `config.toml`\n\n")
-        });
-        let pass = t!(fs::read_to_string(&file));
+        let pass = if env::var("BUILD_MANIFEST_DISABLE_SIGNING").is_err() {
+            let file = builder.config.dist_gpg_password_file.as_ref().unwrap_or_else(|| {
+                panic!("\n\nfailed to specify `dist.gpg-password-file` in `config.toml`\n\n")
+            });
+            t!(fs::read_to_string(&file))
+        } else {
+            String::new()
+        };
 
         let today = output(Command::new("date").arg("+%Y-%m-%d"));
 

src/ci/azure-pipelines/steps/run.yml

@@ -147,8 +147,15 @@ steps:
     git clone --depth=1 https://github.com/rust-lang-nursery/rust-toolstate.git
     cd rust-toolstate
     python2.7 "$BUILD_SOURCESDIRECTORY/src/tools/publish_toolstate.py" "$(git rev-parse HEAD)" "$(git log --format=%s -n1 HEAD)" "" ""
+    # Only check maintainers if this build is supposed to publish toolstate.
+    # Builds that are not supposed to publish don't have the access token.
+    if [ -n "${TOOLSTATE_PUBLISH+is_set}" ]; then
+      TOOLSTATE_VALIDATE_MAINTAINERS_REPO=rust-lang/rust python2.7 "${BUILD_SOURCESDIRECTORY}/src/tools/publish_toolstate.py"
+    fi
     cd ..
     rm -rf rust-toolstate
+  env:
+    TOOLSTATE_REPO_ACCESS_TOKEN: $(TOOLSTATE_REPO_ACCESS_TOKEN)
   condition: and(succeeded(), not(variables.SKIP_JOB), eq(variables['IMAGE'], 'mingw-check'))
   displayName: Verify the publish_toolstate script works
 

src/liballoc/lib.rs

@@ -117,7 +117,7 @@
 #![feature(allocator_internals)]
 #![feature(on_unimplemented)]
 #![feature(rustc_const_unstable)]
-#![feature(const_vec_new)]
+#![cfg_attr(bootstrap, feature(const_vec_new))]
 #![feature(slice_partition_dedup)]
 #![feature(maybe_uninit_extra, maybe_uninit_slice)]
 #![feature(alloc_layout_extra)]

src/liballoc/raw_vec.rs

@@ -113,13 +113,38 @@ impl<T, A: Alloc> RawVec<T, A> {
 }
 
 impl<T> RawVec<T, Global> {
+    /// HACK(Centril): This exists because `#[unstable]` `const fn`s needn't conform
+    /// to `min_const_fn` and so they cannot be called in `min_const_fn`s either.
+    ///
+    /// If you change `RawVec<T>::new` or dependencies, please take care to not
+    /// introduce anything that would truly violate `min_const_fn`.
+    ///
+    /// NOTE: We could avoid this hack and check conformance with some
+    /// `#[rustc_force_min_const_fn]` attribute which requires conformance
+    /// with `min_const_fn` but does not necessarily allow calling it in
+    /// `stable(...) const fn` / user code not enabling `foo` when
+    /// `#[rustc_const_unstable(feature = "foo", ..)]` is present.
+    pub const NEW: Self = Self::new();
+
     /// Creates the biggest possible `RawVec` (on the system heap)
     /// without allocating. If `T` has positive size, then this makes a
     /// `RawVec` with capacity `0`. If `T` is zero-sized, then it makes a
     /// `RawVec` with capacity `usize::MAX`. Useful for implementing
     /// delayed allocation.
     pub const fn new() -> Self {
-        Self::new_in(Global)
+        // FIXME(Centril): Reintegrate this with `fn new_in` when we can.
+
+        // `!0` is `usize::MAX`. This branch should be stripped at compile time.
+        // FIXME(mark-i-m): use this line when `if`s are allowed in `const`:
+        //let cap = if mem::size_of::<T>() == 0 { !0 } else { 0 };
+
+        // `Unique::empty()` doubles as "unallocated" and "zero-sized allocation".
+        RawVec {
+            ptr: Unique::empty(),
+            // FIXME(mark-i-m): use `cap` when ifs are allowed in const
+            cap: [0, !0][(mem::size_of::<T>() == 0) as usize],
+            a: Global,
+        }
     }
 
     /// Creates a `RawVec` (on the system heap) with exactly the

src/liballoc/string.rs

@@ -369,7 +369,7 @@ impl String {
     /// ```
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
-    #[rustc_const_unstable(feature = "const_string_new")]
+    #[cfg_attr(bootstrap, rustc_const_unstable(feature = "const_string_new"))]
     pub const fn new() -> String {
         String { vec: Vec::new() }
     }

src/liballoc/vec.rs

@@ -314,10 +314,10 @@ impl<T> Vec<T> {
     /// ```
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
-    #[rustc_const_unstable(feature = "const_vec_new")]
+    #[cfg_attr(bootstrap, rustc_const_unstable(feature = "const_vec_new"))]
     pub const fn new() -> Vec<T> {
         Vec {
-            buf: RawVec::new(),
+            buf: RawVec::NEW,
             len: 0,
         }
     }

src/librustc/session/config.rs

@@ -7,6 +7,7 @@ use crate::session::{early_error, early_warn, Session};
 use crate::session::search_paths::SearchPath;
 
 use rustc_data_structures::fx::FxHashSet;
+use rustc_data_structures::sync::Lrc;
 
 use rustc_target::spec::{LinkerFlavor, MergeFunctions, PanicStrategy, RelroLevel};
 use rustc_target::spec::{Target, TargetTriple};
@@ -19,6 +20,7 @@ use syntax::parse::{ParseSess, new_parser_from_source_str};
 use syntax::parse::token;
 use syntax::symbol::{sym, Symbol};
 use syntax::feature_gate::UnstableFeatures;
+use syntax::source_map::SourceMap;
 
 use errors::emitter::HumanReadableErrorType;
 use errors::{ColorConfig, FatalError, Handler};
@@ -1850,11 +1852,20 @@ pub fn rustc_optgroups() -> Vec<RustcOptGroup> {
     opts
 }
 
+struct NullEmitter;
+
+impl errors::emitter::Emitter for NullEmitter {
+    fn emit_diagnostic(&mut self, _: &errors::DiagnosticBuilder<'_>) {}
+}
+
 // Converts strings provided as `--cfg [cfgspec]` into a `crate_cfg`.
 pub fn parse_cfgspecs(cfgspecs: Vec<String>) -> FxHashSet<(String, Option<String>)> {
     syntax::with_default_globals(move || {
         let cfg = cfgspecs.into_iter().map(|s| {
-            let sess = ParseSess::new(FilePathMapping::empty());
+
+            let cm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
+            let handler = Handler::with_emitter(false, None, Box::new(NullEmitter));
+            let sess = ParseSess::with_span_handler(handler, cm);
             let filename = FileName::cfg_spec_source_code(&s);
             let mut parser = new_parser_from_source_str(&sess, filename, s.to_string());
 

src/librustc_asan/build.rs

@@ -4,6 +4,7 @@ use build_helper::sanitizer_lib_boilerplate;
 use cmake::Config;
 
 fn main() {
+    println!("cargo:rerun-if-env-changed=RUSTC_BUILD_SANITIZERS");
     if env::var("RUSTC_BUILD_SANITIZERS") != Ok("1".to_string()) {
         return;
     }

src/librustc_codegen_llvm/lib.rs

@@ -226,21 +226,21 @@ impl CodegenBackend for LlvmCodegenBackend {
                 for &(name, _) in back::write::RELOC_MODEL_ARGS.iter() {
                     println!("    {}", name);
                 }
-                println!("");
+                println!();
             }
             PrintRequest::CodeModels => {
                 println!("Available code models:");
                 for &(name, _) in back::write::CODE_GEN_MODEL_ARGS.iter(){
                     println!("    {}", name);
                 }
-                println!("");
+                println!();
             }
             PrintRequest::TlsModels => {
                 println!("Available TLS models:");
                 for &(name, _) in back::write::TLS_MODEL_ARGS.iter(){
                     println!("    {}", name);
                 }
-                println!("");
+                println!();
             }
             req => llvm_util::print(req, sess),
         }

src/librustc_driver/lib.rs

@@ -134,8 +134,11 @@ pub struct TimePassesCallbacks {
 
 impl Callbacks for TimePassesCallbacks {
     fn config(&mut self, config: &mut interface::Config) {
+        // If a --prints=... option has been given, we don't print the "total"
+        // time because it will mess up the --prints output. See #64339.
         self.time_passes =
-            config.opts.debugging_opts.time_passes || config.opts.debugging_opts.time;
+            config.opts.prints.is_empty() &&
+            (config.opts.debugging_opts.time_passes || config.opts.debugging_opts.time);
     }
 }
 

src/librustc_lsan/build.rs

@@ -4,6 +4,7 @@ use build_helper::sanitizer_lib_boilerplate;
 use cmake::Config;
 
 fn main() {
+    println!("cargo:rerun-if-env-changed=RUSTC_BUILD_SANITIZERS");
     if env::var("RUSTC_BUILD_SANITIZERS") != Ok("1".to_string()) {
         return;
     }

src/librustc_mir/const_eval.rs

@@ -134,9 +134,8 @@ fn eval_body_using_ecx<'mir, 'tcx>(
     ecx: &mut CompileTimeEvalContext<'mir, 'tcx>,
     cid: GlobalId<'tcx>,
     body: &'mir mir::Body<'tcx>,
-    param_env: ty::ParamEnv<'tcx>,
 ) -> InterpResult<'tcx, MPlaceTy<'tcx>> {
-    debug!("eval_body_using_ecx: {:?}, {:?}", cid, param_env);
+    debug!("eval_body_using_ecx: {:?}, {:?}", cid, ecx.param_env);
     let tcx = ecx.tcx.tcx;
     let layout = ecx.layout_of(body.return_ty().subst(tcx, cid.instance.substs))?;
     assert!(!layout.is_unsized());
@@ -162,7 +161,6 @@ fn eval_body_using_ecx<'mir, 'tcx>(
         ecx,
         cid.instance.def_id(),
         ret,
-        param_env,
     )?;
 
     debug!("eval_body_using_ecx done: {:?}", *ret);
@@ -658,7 +656,7 @@ pub fn const_eval_raw_provider<'tcx>(
 
     let res = ecx.load_mir(cid.instance.def, cid.promoted);
     res.and_then(
-        |body| eval_body_using_ecx(&mut ecx, cid, body, key.param_env)
+        |body| eval_body_using_ecx(&mut ecx, cid, body)
     ).and_then(|place| {
         Ok(RawConst {
             alloc_id: place.ptr.assert_ptr().alloc_id,