diff --git a/cc/builder.go b/cc/builder.go
index de85d6e..db4cb4f 100644
--- a/cc/builder.go
+++ b/cc/builder.go
@@ -508,8 +508,11 @@
 		return
 	}
 
-	arCmd := gccCmd(flags.toolchain, "ar")
-	arFlags := "crsPD"
+	arCmd := "${config.ClangBin}/llvm-ar"
+	arFlags := "crsD"
+	if !ctx.Darwin() {
+		arFlags += " -format=gnu"
+	}
 	if flags.arFlags != "" {
 		arFlags += " " + flags.arFlags
 	}