// Ensure that we cannot disable strict prototypes, no matter how hard we try.

// RUN: not %clang -fno-no-knr-functions -x c++ %s 2>&1 | FileCheck --check-prefixes=NONO %s
// RUN: not %clang -fno-no-knr-functions -x c %s 2>&1 | FileCheck --check-prefixes=NONO %s
// RUN: not %clang -fno-no-knr-functions -std=c89 -x c %s 2>&1 | FileCheck --check-prefixes=NONO %s
// RUN: not %clang -fknr-functions -x c++ %s 2>&1 | FileCheck --check-prefixes=POS %s
// RUN: not %clang -fknr-functions -x c %s 2>&1 | FileCheck --check-prefixes=POS %s
// RUN: not %clang -fknr-functions -std=c89 -x c %s 2>&1 | FileCheck --check-prefixes=POS %s

// Ensure that the driver flag is actually accepted though.
// RUN: %clang -fno-knr-functions -### %s 2>&1 | FileCheck --check-prefixes=ACCEPTED %s

// NONO: error: unknown argument: '-fno-no-knr-functions'
// POS: error: unknown argument: '-fknr-functions'
// ACCEPTED-NOT: warning: argument unused during compilation: '-fno-knr-functions'