Hi,

after some time I started again playing with D. The following example gives an error I don't understand (I'm trying dmd 2.042):

==== main.d ====
import MyMod;

void main()
{
    MyStruct!(int) s;
}

==== MyMod.d ===
module MyMod;

struct MyStruct(T) {
    this(this) {}
}
================

If I compile the above example with

dmd main.d

I get the following error:

main.o: In function
`_D5MyMod15__T8MyStructTiZ8MyStruct10__postblitMFZv':
main.d:(.text._D5MyMod15__T8MyStructTiZ8MyStruct10__postblitMFZv+0x12):
undefined reference to `_D5MyMod8__assertFiZv'
main.o: In function
`_D5MyMod15__T8MyStructTiZ8MyStruct8opAssignMFNcS5MyMod15__T8MyStructTiZ8MyStructZS5MyMod15__T8MyStructTiZ8MyStruct':
main.d:(.text._D5MyMod15__T8MyStructTiZ8MyStruct8opAssignMFNcS5MyMod15__T8MyStructTiZ8MyStructZS5MyMod15__T8MyStructTiZ8MyStruct+0x12):
undefined reference to `_D5MyMod8__assertFiZv'
collect2: ld returned 1 exit status
--- errorlevel 1

What does this mean? Note that everything works fine if MyStruct is not a template, if there's no function this(this) or if I compile the example with assertions disabled like this:

dmd -release main.d

It seems as I'm missing to implement some function, but I don't know which.

Thanks in advance
Frank

Frank Fischer wrote:
> If I compile the above example with
> 
> dmd main.d

Weird, that command line works fine for me, no errors.

> I get the following error:
> 
> main.o: In function
> `_D5MyMod15__T8MyStructTiZ8MyStruct10__postblitMFZv':
> main.d:(.text._D5MyMod15__T8MyStructTiZ8MyStruct10__postblitMFZv+0x12):
> undefined reference to `_D5MyMod8__assertFiZv'
> main.o: In function
> `_D5MyMod15__T8MyStructTiZ8MyStruct8opAssignMFNcS5MyMod15__T8MyStructTiZ8MyStructZS5MyMod15__T8MyStructTiZ8MyStruct':
> main.d:(.text._D5MyMod15__T8MyStructTiZ8MyStruct8opAssignMFNcS5MyMod15__T8MyStructTiZ8MyStructZS5MyMod15__T8MyStructTiZ8MyStruct+0x12):
> undefined reference to `_D5MyMod8__assertFiZv'
> collect2: ld returned 1 exit status
> --- errorlevel 1
> 
> What does this mean? Note that everything works fine if MyStruct is
> not a template, if there's no function this(this) or if I compile the
> example with assertions disabled like this:
> 
> dmd -release main.d
> 
> It seems as I'm missing to implement some function, but I don't know
> which.

It is either implementing a function, or not calling one - sometimes debug mode will enable extra functions, I note the above undefined reference is to a symbol called MyMod.assert being called from MyStruct.opAssign.

Was that a complete code sample?

Regan

On 3/31/10 09:26, Frank Fischer wrote:
> Hi,
>
> after some time I started again playing with D. The following example
> gives an error I don't understand (I'm trying dmd 2.042):
>
> ==== main.d ====
> import MyMod;
>
> void main()
> {
>      MyStruct!(int) s;
> }
>
> ==== MyMod.d ===
> module MyMod;
>
> struct MyStruct(T) {
>      this(this) {}
> }
> ================
>
> If I compile the above example with
>
> dmd main.d
>
> I get the following error:
>
> main.o: In function
> `_D5MyMod15__T8MyStructTiZ8MyStruct10__postblitMFZv':
> main.d:(.text._D5MyMod15__T8MyStructTiZ8MyStruct10__postblitMFZv+0x12):
> undefined reference to `_D5MyMod8__assertFiZv'
> main.o: In function
> `_D5MyMod15__T8MyStructTiZ8MyStruct8opAssignMFNcS5MyMod15__T8MyStructTiZ8MyStructZS5MyMod15__T8MyStructTiZ8MyStruct':
> main.d:(.text._D5MyMod15__T8MyStructTiZ8MyStruct8opAssignMFNcS5MyMod15__T8MyStructTiZ8MyStructZS5MyMod15__T8MyStructTiZ8MyStruct+0x12):
> undefined reference to `_D5MyMod8__assertFiZv'
> collect2: ld returned 1 exit status
> --- errorlevel 1
>
> What does this mean? Note that everything works fine if MyStruct is
> not a template, if there's no function this(this) or if I compile the
> example with assertions disabled like this:
>
> dmd -release main.d
>
> It seems as I'm missing to implement some function, but I don't know
> which.
>
> Thanks in advance
> Frank
>

I don't know if I'm missing something but don't you have to compile MyMod.d also ?

On 2010-03-31, Regan Heath <regan@netmail.co.nz> wrote:
> Frank Fischer wrote:
>> If I compile the above example with
>> 
>> dmd main.d
>
> Weird, that command line works fine for me, no errors.
>

Strange. I used the linux version 2.042, just downloaded.

> It is either implementing a function, or not calling one - sometimes debug mode will enable extra functions, I note the above undefined reference is to a symbol called MyMod.assert being called from MyStruct.opAssign.
>
> Was that a complete code sample?

Yes, exactly those two files. Nothing more, nothing less. The example also works if I put the struct in the file main.d.

Frank

On 2010-03-31, Jacob Carlborg <doob@me.com> wrote:
> I don't know if I'm missing something but don't you have to compile MyMod.d also ?

Of course, you're right. Don't know why I expected dmd to compile the other files as well, propably because it worked without the this(this) function.

I'm really happy it was only my stupidity ;)

Thanks,
Frank

Frank Fischer wrote:
> On 2010-03-31, Regan Heath <regan@netmail.co.nz> wrote:
>> Frank Fischer wrote:
>>> If I compile the above example with
>>>
>>> dmd main.d
>> Weird, that command line works fine for me, no errors.
>>
> 
> Strange. I used the linux version 2.042, just downloaded.

Ahh.. I am on Windoze.. interesting.

R