|  | /// For -fprofile-instr-generate and -fprofile-arcs, increment counters atomically | 
|  | /// if -fprofile-update={atomic,prefer-atomic} is specified. | 
|  | // RUN: %clang -### %s -c -fprofile-update=atomic 2>&1 | FileCheck %s | 
|  | // RUN: %clang -### %s -c -fprofile-update=prefer-atomic 2>&1 | FileCheck %s | 
|  |  | 
|  | // CHECK: "-fprofile-update=atomic" | 
|  |  | 
|  | // RUN: %clang -### %s -c -fprofile-update=atomic -fprofile-update=single 2>&1 | FileCheck %s --check-prefix=SINGLE | 
|  |  | 
|  | // SINGLE-NOT: "-fprofile-update=atomic" | 
|  |  | 
|  | // RUN: not %clang %s -c -fprofile-update=unknown 2>&1 | FileCheck %s --check-prefix=ERROR | 
|  |  | 
|  | // ERROR: error: unsupported argument 'unknown' to option '-fprofile-update=' | 
|  |  | 
|  | // AIX specific tests | 
|  | // RUN: %clang -### %s --target=powerpc-unknown-aix -fprofile-generate -fprofile-update=atomic 2>&1 | FileCheck %s --check-prefix=AIX | 
|  | // RUN: %clang -### %s --target=powerpc-unknown-aix -fprofile-generate -fprofile-update=prefer-atomic 2>&1 | FileCheck %s --check-prefix=AIX | 
|  | // RUN: %clang -### %s --target=powerpc-unknown-aix -fprofile-generate 2>&1 | FileCheck %s --check-prefix=AIX-NOATOMIC | 
|  | // RUN: %clang -### %s --target=powerpc-unknown-aix -fprofile-generate -fprofile-update=single 2>&1 | FileCheck %s --check-prefix=AIX-NOATOMIC | 
|  | // AIX: "-latomic" | 
|  | // AIX-NOATOMIC-NOT: "-latomic" |