Allow disabling LLVM assertions in rustc (fixes #15548)

README.md

@@ -149,7 +149,7 @@ Servo's build system automatically downloads a Rust compiler to build itself.
 This is normally a specific revision of Rust upstream, but sometimes has a
 backported patch or two.
 If you'd like to know which nightly build of Rust we use, see
-[`rust-nightly-date`](https://github.com/servo/servo/blob/master/rust-nightly-date).
+[`rust-commit-hash`](https://github.com/servo/servo/blob/master/rust-commit-hash).
 
 ## Building
 

appveyor.yml

@@ -37,8 +37,8 @@ branches:
     - master
 
 cache:
-  - .servo -> rust-nightly-date, cargo-commit-hash
-  - .cargo -> rust-nightly-date, cargo-commit-hash
+  - .servo -> rust-commit-hash, cargo-commit-hash
+  - .cargo -> rust-commit-hash, cargo-commit-hash
   - .ccache
 
 install:

python/servo/bootstrap_commands.py

@@ -70,6 +70,8 @@ def bootstrap_rustc(self, force=False, target=[], stable=False):
         rust_path = self.rust_path()
         rust_dir = path.join(self.context.sharedir, "rust", rust_path)
         install_dir = path.join(self.context.sharedir, "rust", version)
+        if not self.config["build"]["llvm-assertions"]:
+            install_dir += "-alt"
 
         if not force and path.exists(path.join(rust_dir, "rustc", "bin", "rustc" + BIN_SUFFIX)):
             print("Rust compiler already downloaded.", end=" ")
@@ -86,9 +88,13 @@ def bootstrap_rustc(self, force=False, target=[], stable=False):
             # in that directory).
             if stable:
                 tarball = "rustc-%s-%s.tar.gz" % (version, host_triple())
+                rustc_url = "https://static-rust-lang-org.s3.amazonaws.com/dist/" + tarball
             else:
                 tarball = "%s/rustc-nightly-%s.tar.gz" % (version, host_triple())
-            rustc_url = "https://static-rust-lang-org.s3.amazonaws.com/dist/" + tarball
+                base_url = "https://s3.amazonaws.com/rust-lang-ci/rustc-builds"
+                if not self.config["build"]["llvm-assertions"]:
+                    base_url += "-alt"
+                rustc_url = base_url + "/" + tarball
             tgz_file = rust_dir + '-rustc.tar.gz'
 
             download_file("Rust compiler", rustc_url, tgz_file)
@@ -126,7 +132,7 @@ def bootstrap_rustc(self, force=False, target=[], stable=False):
                            % (version, target_triple))
                 tgz_file = install_dir + ('rust-std-%s-%s.tar.gz' % (version, target_triple))
             else:
-                std_url = ("https://static-rust-lang-org.s3.amazonaws.com/dist/%s/rust-std-nightly-%s.tar.gz"
+                std_url = ("https://s3.amazonaws.com/rust-lang-ci/rustc-builds/%s/rust-std-nightly-%s.tar.gz"
                            % (version, target_triple))
                 tgz_file = install_dir + ('rust-std-nightly-%s.tar.gz' % target_triple)
 

python/servo/command_base.py

@@ -258,7 +258,6 @@ def resolverelative(category, key):
         self.config["tools"].setdefault("system-cargo", False)
         self.config["tools"].setdefault("rust-root", "")
         self.config["tools"].setdefault("cargo-root", "")
-        self.set_use_stable_rust(False)
         if not self.config["tools"]["system-cargo"]:
             self.config["tools"]["cargo-root"] = path.join(
                 context.sharedir, "cargo", self.cargo_build_id())
@@ -267,6 +266,7 @@ def resolverelative(category, key):
         self.config.setdefault("build", {})
         self.config["build"].setdefault("android", False)
         self.config["build"].setdefault("mode", "")
+        self.config["build"].setdefault("llvm-assertions", True)
         self.config["build"].setdefault("debug-mozjs", False)
         self.config["build"].setdefault("ccache", "")
         self.config["build"].setdefault("rustflags", "")
@@ -279,6 +279,8 @@ def resolverelative(category, key):
         self.config["android"].setdefault("platform", "android-18")
         self.config["android"].setdefault("target", "arm-linux-androideabi")
 
+        self.set_use_stable_rust(False)
+
     _use_stable_rust = False
     _rust_version = None
     _rust_version_is_stable = False
@@ -297,13 +299,14 @@ def rust_path(self):
         version = self.rust_version()
         if self._use_stable_rust:
             return os.path.join(version, "rustc-%s-%s" % (version, host_triple()))
-        else:
-            return os.path.join(version, "rustc-nightly-%s" % (host_triple()))
+        if not self.config["build"]["llvm-assertions"]:
+            version += "-alt"
+        return os.path.join(version, "rustc-nightly-%s" % (host_triple()))
 
     def rust_version(self):
         if self._rust_version is None or self._use_stable_rust != self._rust_version_is_stable:
             filename = path.join(self.context.topdir,
-                                 "rust-stable-version" if self._use_stable_rust else "rust-nightly-date")
+                                 "rust-stable-version" if self._use_stable_rust else "rust-commit-hash")
             with open(filename) as f:
                 self._rust_version = f.read().strip()
         return self._rust_version

rust-commit-hash

@@ -0,0 +1 @@
+025c328bf5ab336ff708e62a59292298dc1bc089

servobuild.example

@@ -39,6 +39,9 @@ rustc-with-gold = true
 # Defaults to prompting before building
 #mode = "dev"
 
+# Whether to enable LLVM assertions in rustc.
+#llvm-assertions = true
+
 # Set "android = true" or use `mach build --android` to build the Android app.
 android = false
 

tests/compiletest/plugin/compile-fail/ban-domrefcell.rs

@@ -13,7 +13,7 @@ use script::test::Node;
 
 struct Foo {
     bar: DOMRefCell<JS<Node>>
-    //~^ ERROR Banned type DOMRefCell<JS<T>> detected. Use MutJS<JS<T>> instead,
+    //~^ ERROR Banned type DOMRefCell<JS<T>> detected. Use MutJS<JS<T>> instead
 }
 
 fn main() {}

tests/compiletest/plugin/compile-fail/ban.rs

@@ -12,7 +12,7 @@ use std::cell::Cell;
 
 struct Foo {
     bar: Cell<JSVal>
-    //~^ ERROR Banned type Cell<JSVal> detected. Use MutJS<JSVal> instead,
+    //~^ ERROR Banned type Cell<JSVal> detected. Use MutJS<JSVal> instead
 }
 
 fn main() {}

tests/compiletest/plugin/compile-fail/privatize.rs

@@ -8,7 +8,7 @@
 extern crate deny_public_fields;
 
 #[derive(DenyPublicFields)]
-//~^ ERROR custom derive attribute panicked
+//~^ ERROR proc-macro derive panicked
 struct Foo {
     pub v1: i32,
     v2: i32