[Issue 18986] New: OSX/FreeBSD: allocating an instance of a C++ class fails

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18986

          Issue ID: 18986
           Summary: OSX/FreeBSD: allocating an instance of a C++ class
                    fails
           Product: D
           Version: D2
          Hardware: x86
                OS: Mac OS X
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: r.sagitario at gmx.de

When allocating a C++ class instance with the constructor defined in C++, the
wrong object address is used:

// testcpp.cpp
class Cpp
{
public:
    Cpp();
    virtual void foo() {}

    int x;
};

Cpp::Cpp()
{
    x = 42;
}

// testd.d
extern(C++)
{
    class Cpp
    {
    public:
        this();
        void foo();

        int x;
    }
}

void main()
{
    Cpp c = new Cpp;
    assert(c.x == 42);
}

The assertion fails for OSX and FreeBSD, but not on Windows and Linux. This
happens because the constructor does not return 'this' on the former platforms.

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