https://issues.dlang.org/show_bug.cgi?id=23723

212fahrenheit@posteo.us changed:

           What    |Removed                     |Added
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                 CC|                            |212fahrenheit@posteo.us

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https://issues.dlang.org/show_bug.cgi?id=23723

RazvanN <razvan.nitu1305@gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |razvan.nitu1305@gmail.com

--- Comment #1 from RazvanN <razvan.nitu1305@gmail.com> ---
As a workaround, templating MyStruct will yield a successful compilation.

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https://issues.dlang.org/show_bug.cgi?id=23723

--- Comment #2 from RazvanN <razvan.nitu1305@gmail.com> ---
(In reply to 212fahrenheit from comment #0)
> This will compile with dmd-2.101.2, but will produce a linking error when using dmd-2.102.0 or dmd-2.102.1
> 
> After upgrading DMD my project it will not build, reducing this was a head scratcher. this is my first time reporting on the tracker here, so hopefully I did a good job, if not, please tell what to do better next time.
> 
> I'm not sure what is going on, but I think this has something to do with attributes being inferred incorrectly, but I may be off the mark, what's also odd is that if you pass both files at once this bug will not be reproduced.
> 
> using `nm` I can see two different signatures
> 
> void std.typecons.SafeRefCounted!(test2.MyStruct, 1).SafeRefCounted.__dtor()
> pure nothrow @nogc void std.typecons.SafeRefCounted!(test2.MyStruct,
> 1).SafeRefCounted.__dtor()
> 
> 
> How to reproduce bug:
> 
> build using: dmd -c test.d && dmd -c test2.d && dmd test.o test2.o
> 
> test.d
> ```
> void main(){
> 	import test2;
> 	MyStruct.RcPtr gl_indcies = MyStruct.RcPtr(MyStruct());
> }
> ```
> 
> test2.d
> ```
> module test2;
> struct MyStruct{
> 	import std.typecons : SafeRefCounted, Unique;
> 	alias Ptr = Unique!(MyStruct);
> 	alias RcPtr = SafeRefCounted!(MyStruct);
> 	~this(){}
> }
> ```
> 
> this is the linking error produced
> ```
> /bin/ld: test.o: in function `_Dmain':
> test.d:(.text._Dmain[_Dmain]+0x2f): undefined reference to
> `_D3std8typecons__T14SafeRefCountedTS5test28MyStructVEQBzQBy24RefCountedAutoI
> nitializei1ZQCs6__dtorMFZv'
> collect2: error: ld returned 1 exit status
> ```a

Reduce to not include phobos:

//test.d

void main()
{
    import test2;
    MyStruct.Ptr a;
}

// test2.d

struct MyStruct
{
    alias Ptr = Unique!(MyStruct);
    ~this(){}
}

struct Unique(T)
{
    /// Transfer ownership from a `Unique` of a type that is convertible to our
type.
    void opAssign(U)(Unique!U u)
    if (is(u.RefT : RefT))
    {

    }

    ~this()
    {
        if (_p !is null)
        {
            destroy(*_p);
            //_p.__dtor();
        }
    }

    T* _p;
}

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https://issues.dlang.org/show_bug.cgi?id=23723

--- Comment #3 from 212fahrenheit@posteo.us ---
(In reply to RazvanN from comment #1)
> As a workaround, templating MyStruct will yield a successful compilation.

Thank you, that is very helpful, I just applied that & it works well, so at least I will not have to use an out of date compiler until the bug is resolved.

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https://issues.dlang.org/show_bug.cgi?id=23723

Iain Buclaw <ibuclaw@gdcproject.org> changed:

           What    |Removed                     |Added
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                 CC|                            |ibuclaw@gdcproject.org

--- Comment #4 from Iain Buclaw <ibuclaw@gdcproject.org> ---
Looks like this is a library regression, not compiler.

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https://issues.dlang.org/show_bug.cgi?id=23723

--- Comment #5 from Iain Buclaw <ibuclaw@gdcproject.org> ---
Introducing commit d5c10671317ca1f3de61acd8be760d1b77aed3a2

https://github.com/dlang/phobos/pull/8651

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https://issues.dlang.org/show_bug.cgi?id=23723

Iain Buclaw <ibuclaw@gdcproject.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|dmd                         |phobos
           Hardware|x86_64                      |All
                 OS|Linux                       |All

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https://issues.dlang.org/show_bug.cgi?id=23723

Paul Backus <snarwin+bugzilla@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |snarwin+bugzilla@gmail.com
          Component|phobos                      |dmd
         Resolution|---                         |DUPLICATE
           Severity|regression                  |normal

--- Comment #6 from Paul Backus <snarwin+bugzilla@gmail.com> ---
It's a compiler bug, originally reported in 2017, several years before the linked Phobos PR was merged.

*** This issue has been marked as a duplicate of issue 17541 ***

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