Fix test module for Bazel 8 (#410)

Clean up canonical label usages and fix runfiles references for
`--nolegacy_external_runfiles`.

.bazelignore

@@ -0,0 +1 @@
+tests

.github/workflows/tests.yml

@@ -28,6 +28,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [macos-latest, ubuntu-latest]
+        # TODO: Test with Bazel 8 after https://github.com/bazelbuild/bazel/pull/24154 has been released.
         bazel_version: [7.0.0, latest] # Minimum supported Bazel version is 7.0.0.
         bzlmod: [true, false]
     runs-on: ${{ matrix.os }}

tests/.bazelrc

@@ -1,2 +1,3 @@
 common --incompatible_disallow_empty_glob
+common --nolegacy_external_runfiles
 build --features=layering_check

tests/BUILD.bazel

@@ -120,7 +120,7 @@ sh_test(
     name = "file_dependency_test",
     srcs = ["file_dependency_test.sh"],
     args = [
-        "$(execpath @llvm_toolchain_llvm//:bin/clang-format)",
+        "$(rootpath @llvm_toolchain_llvm//:bin/clang-format)",
         "$(rootpaths @llvm_toolchain_llvm//:lib)",
     ],
     data = [
@@ -136,7 +136,7 @@ toolchain(
         "@platforms//cpu:arm64",
         "@platforms//os:macos",
     ],
-    toolchain = "@@rules_foreign_cc~~tools~ninja_1.11.1_mac//:ninja_tool",
+    toolchain = "@ninja_mac//:ninja_tool",
     toolchain_type = "@rules_foreign_cc//toolchains:ninja_toolchain",
 )
 

tests/MODULE.bazel

@@ -29,6 +29,8 @@ bazel_dep(name = "rules_foreign_cc", version = "0.12.0")
 bazel_dep(name = "abseil-cpp", version = "20240722.0", repo_name = "com_google_absl")
 
 # As a workaround for https://github.com/bazelbuild/rules_foreign_cc/issues/1018.
+rules_foreign_cc_tools = use_extension("@rules_foreign_cc//foreign_cc:extensions.bzl", "tools")
+use_repo(rules_foreign_cc_tools, ninja_mac = "ninja_1.12.1_mac")
 register_toolchains(
     "//:ninja_mac_arm64_toolchain",
 )
@@ -162,7 +164,7 @@ llvm.toolchain_root(
 llvm.sysroot(
     name = "llvm_toolchain_with_sysroot",
     targets = ["linux-x86_64"],
-    label = "@@org_chromium_sysroot_linux_x64//:sysroot",
+    label = "@org_chromium_sysroot_linux_x64//:sysroot",
 )
 use_repo(llvm, "llvm_toolchain_with_sysroot")
 
@@ -216,3 +218,18 @@ wasi_sdk_sysroots(name = "wasi_sdk_sysroots")
 
 libclang_rt_wasm32 = use_repo_rule("//wasm:wasi_sdk.bzl", "libclang_rt_wasm32")
 libclang_rt_wasm32(name = "libclang_rt_wasm32")
+
+http_archive = use_repo_rule("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+# This sysroot is used by github.com/vsco/bazel-toolchains.
+http_archive(
+    name = "org_chromium_sysroot_linux_x64",
+    build_file_content = """
+filegroup(
+  name = "sysroot",
+  srcs = glob(["*/**"]),
+  visibility = ["//visibility:public"],
+)
+""",
+    sha256 = "84656a6df544ecef62169cfe3ab6e41bb4346a62d3ba2a045dc5a0a2ecea94a3",
+    urls = ["https://commondatastorage.googleapis.com/chrome-linux-sysroot/toolchain/2202c161310ffde63729f29d27fe7bb24a0bc540/debian_stretch_amd64_sysroot.tar.xz"],
+)

tests/WORKSPACE.bzlmod

@@ -2,20 +2,6 @@ workspace(name = "toolchains_llvm_tests")
 
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 
-# This sysroot is used by github.com/vsco/bazel-toolchains.
-http_archive(
-    name = "org_chromium_sysroot_linux_x64",
-    build_file_content = """
-filegroup(
-  name = "sysroot",
-  srcs = glob(["*/**"]),
-  visibility = ["//visibility:public"],
-)
-""",
-    sha256 = "84656a6df544ecef62169cfe3ab6e41bb4346a62d3ba2a045dc5a0a2ecea94a3",
-    urls = ["https://commondatastorage.googleapis.com/chrome-linux-sysroot/toolchain/2202c161310ffde63729f29d27fe7bb24a0bc540/debian_stretch_amd64_sysroot.tar.xz"],
-)
-
 # Well known repos; present here only for testing.
 
 http_archive(

tests/file_dependency_test.sh

@@ -21,10 +21,10 @@ fail() {
 clang_format_path=$1
 libcpp_path=$2
 
-[[ -e ${clang_format_path} ]] || fail "bin/clang-format not found"
+[[ -e ${clang_format_path} ]] || fail "bin/clang-format not found at ${clang_format_path}"
 
 [[ -e ${libcpp_path} ]] ||
   compgen -G "${libcpp_path}" >/dev/null ||
-  fail "libc++.a not found"
+  fail "libc++.a not found at ${libcpp_path}"
 
 echo "SUCCESS!"