http://llvm.org/bugs/show_bug.cgi?id=19668
Bug ID: 19668
Summary: GCC ABI incompatibility when passing object with
trivial copy ctor, trivial dtor, and non-trivial move
ctor
Product: clang
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Consider:
$ cat t.cpp
#include <assert.h>
struct A {
A() : x(42) {}
A(A &&o) : x(o.x) {}
// no dtor, no copy ctor
int x;
};
void foo(A a);
#ifdef CONFIG_1
void foo(A a) {
assert(a.x == 42);
}
#else
int main() {
foo(A());
}
#endif
$ clang++ -c -DCONFIG_1 -std=c++0x t.cpp -o t1.o && g++ -c -std=c++0x t.cpp -o
t2.o && g++ t1.o t2.o -o t && ./t
t: t.cpp:11: void foo(A): Assertion `a.x == 42' failed.
Aborted (core dumped)
This looks like it's been present since Clang added support for C++11. I doubt
anyone ever hits it because if you have a non-trivial move ctor, you probably
have a dtor.
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