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How to fix this union size/alignment requirement under DMD 2.060

A D2 source code containing the following snippet can be compiled under DMD 2.059

union Prefix {
  char[9] data;
  align(1) struct { uint fileno; uint lineno; char delim; };
}
static assert(Prefix.sizeof == 9);

and unfortunately fails under DMD 2.060 (Prefix.sizeof becomes equal to 12).

How can it be fixed?

Solution

  • This seems to do what you want:

    align(1) union Prefix
{
    ubyte[9] data;

    struct
    {
        uint fileno;
        uint lineno;
        char delim;
    }
}

static assert(Prefix.sizeof == 9);