https://llvm.org/bugs/show_bug.cgi?id=23764
Bug ID: 23764
Summary: Clang and GCC disagree about triviality of type with
defaulted non-const copy constructor (breaks ABI!)
Product: clang
Version: 3.6
Hardware: PC
OS: Linux
Status: NEW
Severity: release blocker
Priority: P
Component: C++11
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
The program below outputs 0 when compiled with Clang and 1 when compiled with
G++.
Unfortunately, this disagreement means that Clang and G++ implement different
argument-passing conventions for functions which take an argument with such a
type, and therefore libraries which use such types in their API (like Cap'n
Proto) cannot be used unless the library and caller are built with the same
compiler.
#include <iostream>
class C {
public:
C(C&) = default;
};
int main() {
std::cout << __has_trivial_copy(C) << std::endl;
return 0;
}
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