https://llvm.org/bugs/show_bug.cgi?id=31049
Bug ID: 31049
Summary: [MS] Clang passes small objects with implicitly
deleted copy constructors incorrectly on x64
Product: clang
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangb...@nondot.org
Reporter: r...@google.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Consider:
struct A {
A();
A(A &&o) : a(o.a) {}
int a;
};
struct B {
B();
// B(B &&o);
A a;
int val;
};
int getit(B b) { return b.val; }
B's copy ctor is implicitly deleted, but the ABI code can't figure it out
because there isn't enough information in the AST right now.
Itanium has similar bugs. Fixing this in all cases will require a big overhaul
of how we track special member triviality, but it's probably worth doing in the
long run.
For now, we can probably add a workaround to MicrosoftCXXABI.cpp.
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