[build] Upgrade rules_rs to 0.0.90 and build Rust against @llvm on macOS (#17683)

rules_rs 0.0.90 bundles a newer rules_rust and pulls llvm 0.8.3, which
breaks the Selenium Manager build in three ways:

1. The cargo build-script runner now rejects libtool as the archiver
   (AR). macOS C++ toolchains (autodetected and apple_support alike) use
   libtool by default, breaking every Rust crate with a build script.
   Fix: register the hermetic @llvm toolchain for macOS exec (mirroring
   Windows) and, on macOS, disable C++ toolchain autodetection and switch
   the rules_cc archiver from libtool to llvm-ar.

2. The selenium-manager binary fails to compile because clap's
   #[clap(about)] derives the description from CARGO_PKG_DESCRIPTION,
   which rules_rust no longer sets. Fix: set it via rustc_env, kept in
   sync with rust/Cargo.toml.

3. On Windows, no Rust toolchain matches //:local_windows_gnullvm: the
   gnullvm toolchain now requires crt:msvcrt, but the crt constraint
   defaults to ucrt. Fix: select msvcrt explicitly on the platform.

Also pins llvm to 0.8.3 to match the resolved version. Linux is
unaffected.

Author: AutomatedTester

.bazelrc

@@ -90,6 +90,13 @@ build:windows --host_per_file_copt=external/protobuf\\+.*@/w
 common --enable_platform_specific_config
 common:linux --host_platform=//:local_linux_gnu
 common:windows --host_platform=//:local_windows_gnullvm
+
+# rules_rs 0.0.90 bundles a newer rules_rust whose cargo build-script runner
+# rejects libtool as the archiver (AR). macOS toolchains use libtool by default,
+# so build Rust against the hermetic @llvm toolchain (registered for macOS exec
+# in MODULE.bazel) with the rules_cc archiver switched from libtool to llvm-ar.
+common:macos --repo_env=BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN=1
+common:macos --@rules_cc//cc/toolchains/args/archiver_flags:use_libtool_on_macos=False
 build:linux --workspace_status_command=scripts/build-info.sh
 build:macos --workspace_status_command=scripts/build-info.sh
 build:windows --workspace_status_command="powershell.exe scripts/build-info.ps1"

BUILD.bazel

@@ -129,7 +129,12 @@ platform(
 platform(
     name = "local_windows_gnullvm",
     constraint_values = [
+        # alias -> @llvm//constraints/windows/abi:gnullvm
         "@rules_rs//rs/platforms/constraints:windows_gnullvm",
+        # rules_rs 0.0.90 (via llvm 0.8.3) requires the CRT to be selected
+        # explicitly; the gnullvm Rust toolchain targets msvcrt, while the crt
+        # constraint otherwise defaults to ucrt and no toolchain would match.
+        "@llvm//constraints/windows/crt:msvcrt",
     ],
     parents = ["@platforms//host"],
 )

MODULE.bazel

@@ -10,7 +10,7 @@ bazel_dep(name = "bazel_features", version = "1.47.1")
 bazel_dep(name = "bazel_skylib", version = "1.9.0")
 bazel_dep(name = "buildifier_prebuilt", version = "8.5.1.2")
 bazel_dep(name = "contrib_rules_jvm", version = "0.33.0")
-bazel_dep(name = "llvm", version = "0.7.9")
+bazel_dep(name = "llvm", version = "0.8.3")
 bazel_dep(name = "package_metadata", version = "0.0.10")
 bazel_dep(name = "platforms", version = "1.1.0")
 
@@ -39,7 +39,7 @@ bazel_dep(name = "rules_pkg", version = "1.2.0")
 bazel_dep(name = "rules_python", version = "1.9.0")
 bazel_dep(name = "rules_proto", version = "7.1.0")
 bazel_dep(name = "rules_ruby", version = "0.26.0")
-bazel_dep(name = "rules_rs", version = "0.0.61")
+bazel_dep(name = "rules_rs", version = "0.0.90")
 
 single_version_override(
     module_name = "rules_jvm_external",
@@ -399,6 +399,14 @@ llvm_toolchains.exec(
     arch = "aarch64",
     os = "windows",
 )
+llvm_toolchains.exec(
+    arch = "aarch64",
+    os = "macos",
+)
+llvm_toolchains.exec(
+    arch = "x86_64",
+    os = "macos",
+)
 use_repo(llvm_toolchains, "llvm_toolchains")
 
 register_toolchains("@llvm_toolchains//:all")

rust/BUILD.bazel

@@ -78,6 +78,12 @@ rust_binary(
     srcs = ["src/main.rs"],
     aliases = aliases(),
     edition = "2024",
+    # clap's `#[clap(about)]` derives the CLI description from
+    # CARGO_PKG_DESCRIPTION. Cargo sets this from Cargo.toml automatically, but
+    # the Bazel build must supply it explicitly. Keep in sync with rust/Cargo.toml.
+    rustc_env = {
+        "CARGO_PKG_DESCRIPTION": "Selenium Manager is a CLI tool that automatically manages the browser/driver resources required by Selenium.",
+    },
     version = "0.4.45",
     visibility = ["//visibility:public"],
     deps = [