lib/asan/lit_tests/Linux/preinit_test.cc

// RUN: %clangxx      -DFUNC=zzzz %s -shared -o %t.so -fPIC
// RUN: %clangxx_asan -DFUNC=main %s         -o %t    -Wl,-R. %t.so
// RUN: %t

// This test ensures that we call __asan_init early enough.
// We build a shared library w/o asan instrumentation
// and the binary with asan instrumentation.
// Both files include the same header (emulated by -DFUNC here)
// with C++ template magic which runs global initializer at library load time.
// The function get() is instrumented with asan, but called
// before the usual constructors are run.
// So, we must make sure that __asan_init is executed even earlier.
//
// See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56393

struct A {
  int foo() const { return 0; }
};
A get () { return A(); }
template <class> struct O {
  static A const e;
};
template <class T> A const O <T>::e = get();
int FUNC() {
  return O<int>::e.foo();
}