[Issue 6348] New: Returning a struct from a C library function doesn't work correctly in 64 bit binaries

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=6348

           Summary: Returning a struct from a C library function doesn't
                    work correctly in 64 bit binaries
           Product: D
           Version: D1 & D2
          Platform: x86_64
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: siegelords_abode at yahoo.com


--- Comment #0 from siegelords_abode at yahoo.com 2011-07-19 11:52:32 PDT ---
Create two files with these contents.

File: test.c

typedef struct
{
    float r,g,b,a;
} COLOR;

COLOR makecol(float r, float g, float b, float a)
{
    COLOR ret;
    ret.r = r;
    ret.g = g;
    ret.b = b;
    ret.a = a;
    return ret;
}

File: test.d

import std.stdio;

struct COLOR
{
    float r,g,b,a;
}

extern (C) COLOR makecol(float r, float g, float b, float a);

void main()
{
    auto col = makecol(1, 0.5, 1, 0.5);
    writefln("%s, %s, %s, %s", col.r, col.g, col.b, col.a);
}

Now compile the whole mess and test:

gcc -c test.c && ar -r test.a test.o
dmd test.d test.a
./test

The expected output is "1, 0.5, 1, 0.5" but actually it output something
completely different ("0, 0, 0, 0" on my system). This happens with both dmd
2.054 and 1.069.

Perhaps this bug is related to 5570?

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