[llvm-dev] Clang/GCC overload resolution disagreement

TellowKrinkle via llvm-dev llvm-dev at lists.llvm.org
Sun Aug 30 14:53:06 PDT 2020

Given the following code:

struct A {};
struct B: public A {
	explicit B(A a) {}
struct C: public B {};
B yay(const C& thing) {
	return B(thing);

Clang uses B’s copy constructor, while GCC refuses to compile, claiming an ambiguity between B’s copy constructor and the explicit B(A) constructor

Which compiler is correct here?

Live example: https://gcc.godbolt.org/z/3doW5d

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