https://issues.dlang.org/show_bug.cgi?id=20208

--- Comment #1 from Eduard Staniloiu <edi33416@gmail.com> ---
Forgot to mention.

I also tested with gdc-9 and everything works as expected (same result as with
ldc).

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https://issues.dlang.org/show_bug.cgi?id=20208

RazvanN <razvan.nitu1305@gmail.com> changed:

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                 CC|                            |razvan.nitu1305@gmail.com

--- Comment #2 from RazvanN <razvan.nitu1305@gmail.com> ---
It seems that this is the cause of your problems: https://github.com/dlang/dmd/pull/9806

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https://issues.dlang.org/show_bug.cgi?id=20208

kinke <kinke@gmx.net> changed:

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                 CC|                            |kinke@gmx.net

--- Comment #3 from kinke <kinke@gmx.net> ---
We probably have to emit extern(C++) copy ctors as 2 symbols for non-Windows,
both the C1 ('complete object ctor') and the C2 ('base object constructor')
variant. There's even a third one, C3 ('complete object allocating
constructor'). A similar mess as for the C++ dtors.

The testcase in https://github.com/dlang/dmd/pull/9806 needed the C2 one, so I assumed it would suffice, but it clearly doesn't: https://godbolt.org/z/qD5Tta

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https://issues.dlang.org/show_bug.cgi?id=20208

Tim <tim.dlang@t-online.de> changed:

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           See Also|                            |https://issues.dlang.org/sh
                   |                            |ow_bug.cgi?id=22636

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https://issues.dlang.org/show_bug.cgi?id=20208

Iain Buclaw <ibuclaw@gdcproject.org> changed:

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           Priority|P1                          |P4

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https://issues.dlang.org/show_bug.cgi?id=20208

Paul Backus <snarwin+bugzilla@gmail.com> changed:

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           Keywords|                            |C++
                 CC|                            |snarwin+bugzilla@gmail.com

--- Comment #4 from Paul Backus <snarwin+bugzilla@gmail.com> ---
Someone just ran into this in the community Discord. I was able to reproduce using both DMD 2.104.0 and LDC 1.33.0 as the D compiler, with the following example program:

--- test.d
extern(C++)
struct Test
{
        this(const ref Test other) {}
}
--- main.cpp
struct Test
{
        Test() = default;
        Test(const Test &other);
};

int main()
{
        Test a;
        Test b = a;
        return 0;
}
---

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