From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: John Kleinschmidt <jkleinsc@github.com>
Date: Thu, 20 Sep 2018 17:49:45 -0700
Subject: windows_cc_wrapper.patch

Allow use of cc_wrapper (eg sccache).

diff --git a/build/toolchain/win/BUILD.gn b/build/toolchain/win/BUILD.gn
index eb3e2b2b377dde31e062be46837bf509ecab0325..5c014b190e121619056aa2eb7301887d47490d57 100644
--- a/build/toolchain/win/BUILD.gn
+++ b/build/toolchain/win/BUILD.gn
@@ -6,6 +6,7 @@ import("//build/config/clang/clang.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/win/visual_studio_version.gni")
+import("//build/toolchain/cc_wrapper.gni")
 import("//build/toolchain/clang_static_analyzer.gni")
 import("//build/toolchain/goma.gni")
 import("//build/toolchain/toolchain.gni")
@@ -28,8 +29,14 @@ if (use_goma) {
   } else {
     goma_prefix = "$goma_dir/gomacc "
   }
+  clang_prefix = goma_prefix
 } else {
   goma_prefix = ""
+  if (cc_wrapper != "") {
+    clang_prefix = cc_wrapper + " "
+  } else {
+    clang_prefix = ""
+  }
 }
 
 # Copy the VS runtime DLL for the default toolchain to the root build directory
@@ -392,7 +399,7 @@ if (win_build_host_cpu != "x64") {
   msvc_toolchain("win_clang_" + win_build_host_cpu) {
     environment = "environment." + win_build_host_cpu
     prefix = rebase_path("$clang_base_path/bin", root_build_dir)
-    cl = "${goma_prefix}$prefix/${clang_cl}"
+    cl = "${clang_prefix}$prefix/${clang_cl}"
     sys_include_flags = "${build_cpu_toolchain_data.include_flags_imsvc}"
     if (host_os != "win") {
       # For win cross build.
@@ -441,7 +448,7 @@ template("win_x64_toolchains") {
   msvc_toolchain("win_clang_" + target_name) {
     environment = "environment.x64"
     prefix = rebase_path("$clang_base_path/bin", root_build_dir)
-    cl = "${goma_prefix}$prefix/${clang_cl}"
+    cl = "${clang_prefix}$prefix/${clang_cl}"
     sys_include_flags = "${x64_toolchain_data.include_flags_imsvc}"
     if (host_os != "win") {
       # For win cross build