• d-bugmail puremagic.com (40/41) Apr 03 2023 https://issues.dlang.org/show_bug.cgi?id=23820

d-bugmail puremagic.com writes:

https://issues.dlang.org/show_bug.cgi?id=23820

          Issue ID: 23820
           Summary: Undefined reference to RTInfoImpl
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody puremagic.com
          Reporter: alphaglosined gmail.com

This is an issue that I've had for a while that only occurs within dmd as of
2.102.0, works in ldc.

Scenario: -betterC DLL, full D executable.

Results in missing symbols during the executable linking such as:
_D6object__T10RTInfoImplVAmA2i96i1063ZQBayG2m

From what I can tell, dmd is emitting RTInfo at the type being compiled. Which

of course may not exist. In this scenario and it would be better to initialize
the template and emit it when required instead.

The workaround for this at the user side (full D executable) is to create
stubs:

```d
version (DigitalMars) version = NeedStubs;

version (NeedStubs) {
    static foreach (Stub; [
        "_D6object__T10RTInfoImplVAmA2i96i1063ZQBayG2m",
        "_D6object__T10RTInfoImplVAmA2i136i87079ZQBcyG2m",
        "_D6object__T10RTInfoImplVAmA2i208i3560789ZQBeyG2m",
        "_D6object__T10RTInfoImplVAmA2i56i66ZQyyG2m",
        "_D6object__T10RTInfoImplVAmA2i264i6098517954ZQBhyG2m",
        "_D6object__T10RTInfoImplVAmA2i168i349524ZQBdyG2m",
        "_D6object__T10RTInfoImplVAmA2i152i305834ZQBdyG2m",
    ]) {
        mixin(() { return "extern(C) void " ~ Stub ~ "() { asm { naked; dl 0;
dl 0;}\n}\n"; }());
    }
}
```

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