tests with sysroot

WORKSPACE

@@ -19,12 +19,41 @@ bazel_toolchain_dependencies()
 
 load("@com_grail_bazel_toolchain//toolchain:rules.bzl", "llvm_toolchain")
 
+
+LLVM_VERSION = "14.0.0"
+
 llvm_toolchain(
     name = "llvm_toolchain",
-    llvm_version = "14.0.0",
+    llvm_version = LLVM_VERSION,
 )
 
-load("@llvm_toolchain//:toolchains.bzl", "llvm_register_toolchains")
+# 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"],
+)
+
+llvm_toolchain(
+    name = "llvm_toolchain_with_sysroot",
+    llvm_version = LLVM_VERSION,
+    sysroot = {
+        "linux-x86_64": "@org_chromium_sysroot_linux_x64//:sysroot",
+    },
+    # We can share the downloaded LLVM distribution with the first configuration.
+    toolchain_roots = {
+        "": "@llvm_toolchain_llvm//",
+    },
+)
+
+load("@llvm_toolchain_with_sysroot//:toolchains.bzl", "llvm_register_toolchains")
 
 #llvm_register_toolchains()