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diff --git a/clang/test/Driver/Wp-args.c b/clang/test/Driver/Wp-args.c
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+// Check that we extract -MD from '-Wp,-MD,FOO', which is used by a number of
+// major projects (e.g., FireFox and the Linux Kernel).
+
+// RUN: %clang --target i386-pc-linux-gnu -### \
+// RUN: -Wp,-MD,FOO.d -fsyntax-only %s 2> %t
+// RUN: FileCheck < %t %s
+//
+// CHECK: "-cc1"
+// CHECK-NOT: -MD
+// CHECK: "-dependency-file" "FOO.d"
+// CHECK: "-MT"
+//
+// PR4062