llvm-project/clang/test/SemaCXX/offsetof-0x.cpp

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C++

// RUN: %clang_cc1 -triple x86_64-apple-darwin10.0.0 -fsyntax-only -std=c++11 -verify %s -Winvalid-offsetof
struct NonPOD {
virtual void f();
int m;
};
struct P {
NonPOD fieldThatPointsToANonPODType;
};
void f() {
int i = __builtin_offsetof(P, fieldThatPointsToANonPODType.m); // expected-warning{{offset of on non-standard-layout type 'P'}}
}
struct StandardLayout {
int x;
StandardLayout() {}
};
int o = __builtin_offsetof(StandardLayout, x); // no-warning