| // Check that -E -M -MF does not cause an "argument unused" error, by adding | 
 | // -Werror to the clang invocation.  Also check the dependency output, if any. | 
 | // RUN: %clang -Werror -E -M -MF %t-M.d %s | 
 | // RUN: FileCheck --input-file=%t-M.d %s | 
 | // CHECK: pr13851.o: | 
 | // CHECK: pr13851.c | 
 |  | 
 | // Check that -E -MM -MF does not cause an "argument unused" error, by adding | 
 | // -Werror to the clang invocation.  Also check the dependency output, if any. | 
 | // RUN: %clang -Werror -E -MM -MF %t-MM.d %s | 
 | // RUN: FileCheck --input-file=%t-MM.d %s |