File: main.cpp

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llvm-toolchain-13 1%3A13.0.1-6~deb10u4
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volatile int x;

void __attribute__((noinline)) sink() {
  x++; /* break here */
}

void __attribute__((noinline)) func3() { sink(); /* tail */ }

void __attribute__((disable_tail_calls, noinline)) func2() { func3(); /* regular */ }

void __attribute__((noinline)) func1() { func2(); /* tail */ }

int __attribute__((disable_tail_calls)) main() {
  func1(); /* regular */
  return 0;
}