Merge "Allow the clang version used for bindgen to be configured."

	// bindgen should specify its own Clang revision so updating Clang isn't potentially blocked on bindgen failures.

	bindgenClangVersion = "clang-r399163b"

	_ = pctx.VariableFunc("bindgenClangVersion", func(ctx android.PackageVarContext) string {

		if override := ctx.Config().Getenv("LLVM_BINDGEN_PREBUILTS_VERSION"); override != "" {

			return override

		}

		return bindgenClangVersion

	})

	//TODO(b/160803703) Use a prebuilt bindgen instead of the built bindgen.

	_ = pctx.HostBinToolVariable("bindgenCmd", "bindgen")

	_ = pctx.SourcePathVariable("bindgenClang",

		"${cc_config.ClangBase}/${config.HostPrebuiltTag}/"+bindgenClangVersion+"/bin/clang")

		"${cc_config.ClangBase}/${config.HostPrebuiltTag}/${bindgenClangVersion}/bin/clang")

	_ = pctx.SourcePathVariable("bindgenLibClang",

		"${cc_config.ClangBase}/${config.HostPrebuiltTag}/"+bindgenClangVersion+"/lib64/")

		"${cc_config.ClangBase}/${config.HostPrebuiltTag}/${bindgenClangVersion}/lib64/")

	//TODO(ivanlozano) Switch this to RuleBuilder

	bindgen = pctx.AndroidStaticRule("bindgen",