Index: llvm/trunk/utils/gn/build/toolchain/BUILD.gn
===================================================================
--- llvm/trunk/utils/gn/build/toolchain/BUILD.gn
+++ llvm/trunk/utils/gn/build/toolchain/BUILD.gn
@@ -175,6 +175,7 @@
   toolchain_args = {
     current_os = host_os
     current_cpu = host_cpu
+    is_clang = true
     use_lld = host_os != "mac"
   }
 }
@@ -184,6 +185,7 @@
     toolchain_args = {
       current_os = "android"
       current_cpu = "arm64"
+      is_clang = true
       use_lld = true
     }
   }