1 files changed, 27 insertions, 0 deletions
diff --git a/third_party/clang_toolchain/cc_configure_clang.bzl b/third_party/clang_toolchain/cc_configure_clang.bzl
new file mode 100644
index 0000000000..1181110ea9
--- /dev/null
+++ b/third_party/clang_toolchain/cc_configure_clang.bzl
@@ -0,0 +1,27 @@
+""" Downloads clang and configures the crosstool using bazel's autoconf."""
+
+load("@bazel_tools//tools/cpp:cc_configure.bzl", "cc_autoconf_impl")
+load(":download_clang.bzl", "download_clang")
+
+_TF_DOWNLOAD_CLANG = "TF_DOWNLOAD_CLANG"
+_TF_NEED_CUDA = "TF_NEED_CUDA"
+
+def _cc_clang_autoconf(repo_ctx):
+  if repo_ctx.os.environ.get(_TF_DOWNLOAD_CLANG) != "1":
+    return
+  if repo_ctx.os.environ.get(_TF_NEED_CUDA) == "1":
+    # Clang is handled separately for CUDA configs.
+    # See cuda_configure.bzl for more details.
+    return
+
+  download_clang(repo_ctx, out_folder='extra_tools')
+  overriden_tools = {'gcc': 'extra_tools/bin/clang'}
+  cc_autoconf_impl(repo_ctx, overriden_tools)
+
+cc_download_clang_toolchain = repository_rule(
+    environ = [
+        _TF_DOWNLOAD_CLANG,
+        _TF_NEED_CUDA,
+    ],
+    implementation = _cc_clang_autoconf,
+)