• d-bugmail puremagic.com (41/41) Dec 22 2021 https://issues.dlang.org/show_bug.cgi?id=22624

d-bugmail puremagic.com writes:

https://issues.dlang.org/show_bug.cgi?id=22624

          Issue ID: 22624
           Summary: importC: bit field misaligns following members in D
                    struct .init
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody puremagic.com
          Reporter: duser airmail.cc

mod.c:

---
struct cstruct {
        unsigned int bit : 1;
};
---

main.d:

---
import std.stdio;
import mod;
struct dstruct
{
        cstruct x;
        ubyte[8] msg = [1, 2, 3, 4, 5, 6, 7, 8];
}
void main()
{
        dstruct v;
        writeln(v.msg);
        assert(dstruct.init.msg == [1, 2, 3, 4, 5, 6, 7, 8]); // ok
        assert(v.msg == [1, 2, 3, 4, 5, 6, 7, 8]); // error
}
---

it should print the array as written in the source, but instead it prints [0,
0, 0, 0, 1, 2, 3, 4]

version: DMD64 D Compiler v2.098.0-361-g415e58e6d (current git master)

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