• d-bugmail puremagic.com (56/56) Jun 01 https://issues.dlang.org/show_bug.cgi?id=24577

d-bugmail puremagic.com writes:

https://issues.dlang.org/show_bug.cgi?id=24577

          Issue ID: 24577
           Summary: Struct with constructor returned from C++ wrong
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody puremagic.com
          Reporter: tim.dlang t-online.de

//////////////// testcpp.cpp //////////////
struct S
{
    int i;
    S();
    S(int i);
};

S::S() : i(0)
{
}

S::S(int i) : i(i)
{
}

S f()
{
    S r;
    r.i = 5;
    return r;
}
//////////////// test.d ////////////////////
import std.stdio;

extern(C++) struct S
{
    int i;
    this(int i);
}

extern(C++) S f();

void main()
{
    S s = f();
    writeln("test ", s);
    stdout.flush();
    assert(s.i == 5);
}
////////////////////////////////////////////

The above example can be compiled on Windows with:
cl /c testcpp.cpp
dmd -g -w -m64 test.d testcpp.obj

When running it will print a wrong random number:
test S(-246417088)

It only fails for DMD on Windows with -m64. It works correctly with -m32mscoff
or on Linux or OSX.

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