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-rw-r--r--test/Driver/thinlto_backend.c10
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diff --git a/test/Driver/thinlto_backend.c b/test/Driver/thinlto_backend.c
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+++ b/test/Driver/thinlto_backend.c
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+// RUN: %clang -O2 %s -flto=thin -c -o %t.o
+// RUN: llvm-lto -thinlto -o %t %t.o
+
+// -fthinlto_index should be passed to cc1
+// RUN: %clang -O2 -o %t1.o -x ir %t.o -c -fthinlto-index=%t.thinlto.bc -### 2>&1 | FileCheck %s -check-prefix=CHECK-THINLTOBE-ACTION
+// CHECK-THINLTOBE-ACTION: -fthinlto-index=
+
+// Ensure clang driver gives the expected error for incorrect input type
+// RUN: not %clang -O2 -o %t1.o %s -c -fthinlto-index=%t.thinlto.bc 2>&1 | FileCheck %s -check-prefix=CHECK-WARNING
+// CHECK-WARNING: error: invalid argument '-fthinlto-index={{.*}}' only allowed with '-x ir'