1// RUN: cp %s %t-duplicate.modulemap
2// RUN: not %clang_cc1 -fmodules -fmodules-cache-path=%t -fmodule-map-file=%s -fmodule-map-file=%t-duplicate.modulemap -fsyntax-only -x c++ /dev/null 2>&1 | FileCheck --check-prefix=CHECK-DUPLICATE %s
3
4// PR22299: Ensure we can produce diagnostics for duplicate modules from -fmodule-map-file=.
5//
6// CHECK-DUPLICATE: duplicate.modulemap:[[@LINE+2]]:8: error: redefinition of module 'foo'
7// CHECK-DUPLICATE: diagnostics.modulemap:[[@LINE+1]]:8: note: previously defined here
8module foo {}
9