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diff --git a/clang/test/Driver/darwin-stdlib.cpp b/clang/test/Driver/darwin-stdlib.cpp
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+// RUN: %clang -target x86_64-apple-darwin -arch arm64 -miphoneos-version-min=7.0 %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-LIBCXX
+// RUN: %clang -target x86_64-apple-darwin -mmacosx-version-min=10.8 %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-LIBSTDCXX
+// RUN: %clang -target x86_64-apple-darwin -mmacosx-version-min=10.9 %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-LIBCXX
+// RUN: %clang -target x86_64-apple-darwin -arch armv7s -miphoneos-version-min=6.1 %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-LIBSTDCXX
+// RUN: %clang -target x86_64-apple-darwin -arch armv7s -miphoneos-version-min=7.0 %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-LIBCXX
+// RUN: %clang -target x86_64-apple-darwin -arch armv7k %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-LIBCXX
+
+// The purpose of this test is that the libc++ headers should be found
+// properly. At the moment this is done by passing -stdlib=libc++ down to the
+// cc1 invocation. If and when we change to finding them in the driver this test
+// should reflect that.
+
+// CHECK-LIBCXX: -stdlib=libc++
+
+// CHECK-LIBSTDCXX-NOT: -stdlib=libc++
+// CHECK-LIBSTDCXX-NOT: -stdlib=libstdc++
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