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DLL creation fails with undefined symbol error
Apr 26, 2019
dokutoku
Apr 26, 2019
evilrat
Apr 26, 2019
dokutoku
Apr 27, 2019
evilrat
Apr 29, 2019
Kagamin
May 11, 2019
kinke
April 26, 2019
Gravatar of dokutokuPosted by dokutokuReply
dokutoku
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I tried to build a DLL in a Windows 64bit environment.
It works well if the compiler is DMD, but in the case of LDC, the build fails with a large number of undefined symbol errors.

Is this a DUB or LDC bug?
Or do I have to specify some additional arguments to the command?
April 26, 2019
Gravatar of evilratPosted by evilrat
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evilrat
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On Friday, 26 April 2019 at 05:08:32 UTC, dokutoku wrote:
> I tried to build a DLL in a Windows 64bit environment.
> It works well if the compiler is DMD, but in the case of LDC, the build fails with a large number of undefined symbol errors.
>
> Is this a DUB or LDC bug?
> Or do I have to specify some additional arguments to the command?

Seems like DMD links some system and/or runtime libs for you, while LDC doesn't.

What symbols are missing? It could be just msvcrt and some of the default system libs such as system32 and the like.
April 26, 2019
Gravatar of dokutokuPosted by dokutoku
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dokutoku
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On Friday, 26 April 2019 at 12:37:46 UTC, evilrat wrote:
> On Friday, 26 April 2019 at 05:08:32 UTC, dokutoku wrote:
>> I tried to build a DLL in a Windows 64bit environment.
>> It works well if the compiler is DMD, but in the case of LDC, the build fails with a large number of undefined symbol errors.
>>
>> Is this a DUB or LDC bug?
>> Or do I have to specify some additional arguments to the command?
>
> Seems like DMD links some system and/or runtime libs for you, while LDC doesn't.
>
> What symbols are missing? It could be just msvcrt and some of the default system libs such as system32 and the like.


There was an error like this.

```
Performing "debug" build using C:\ldc\bin\ldc2.exe for x86_64.
test ~master: building configuration "library"...
lld-link: error: <root : undefined symbol: _DllMainCRTStartup
lld-link: error: undefined symbol: strlen
    referenced by druntime-ldc.lib(exception.obj):(_d_assertp)
    referenced by druntime-ldc.lib(exception.obj):(_d_unittestp)
    referenced by druntime-ldc.lib(exception.obj):(_d_arrayboundsp)

lld-link: error: undefined symbol: __acrt_iob_func
    referenced by legacy_stdio_definitions.lib(legacy_stdio_definitions.obj):($LN3)
    referenced by legacy_stdio_definitions.lib(legacy_stdio_definitions.obj):($LN3)
    referenced by legacy_stdio_definitions.lib(legacy_stdio_definitions.obj):($LN3)
    referenced by legacy_stdio_definitions.lib(legacy_stdio_definitions.obj):($LN3)
    referenced by legacy_stdio_definitions.lib(legacy_stdio_definitions.obj):($LN3)
    referenced by legacy_stdio_definitions.lib(legacy_stdio_definitions.obj):($LN3)
    referenced by legacy_stdio_definitions.lib(legacy_stdio_definitions.obj):($LN3)
    referenced by legacy_stdio_definitions.lib(legacy_stdio_definitions.obj):($LN3)

lld-link: error: undefined symbol: __stdio_common_vfwprintf
    referenced by legacy_stdio_definitions.lib(legacy_stdio_definitions.obj):($LN3)

lld-link: error: undefined symbol: __stdio_common_vfwscanf
    referenced by legacy_stdio_definitions.lib(legacy_stdio_definitions.obj):($LN3)

lld-link: error: undefined symbol: __stdio_common_vswprintf
    referenced by legacy_stdio_definitions.lib(legacy_stdio_definitions.obj):($LN5)

lld-link: error: undefined symbol: __stdio_common_vswscanf
    referenced by legacy_stdio_definitions.lib(legacy_stdio_definitions.obj):($LN3)

lld-link: error: undefined symbol: __stdio_common_vfprintf
    referenced by legacy_stdio_definitions.lib(legacy_stdio_definitions.obj):($LN3)

lld-link: error: undefined symbol: __stdio_common_vfscanf
    referenced by legacy_stdio_definitions.lib(legacy_stdio_definitions.obj):($LN3)

lld-link: error: undefined symbol: __stdio_common_vsprintf
    referenced by legacy_stdio_definitions.lib(legacy_stdio_definitions.obj):($LN5)
    referenced by legacy_stdio_definitions.lib(legacy_stdio_definitions.obj):($LN5)

lld-link: error: undefined symbol: __stdio_common_vsscanf
    referenced by legacy_stdio_definitions.lib(legacy_stdio_definitions.obj):($LN3)

lld-link: error: undefined symbol: strlen
    referenced by druntime-ldc.lib(object.obj):(_D6object10ModuleInfo4nameMxFNaNbNdNiZAya)

lld-link: error: undefined symbol: malloc
    referenced by druntime-ldc.lib(lifetime.obj):(_d_newclass)
    referenced by druntime-ldc.lib(lifetime.obj):(_D2rt8lifetime__T11_d_newclassVbi1ZQsFNbxC14TypeInfo_ClassZC6Object)
    referenced by druntime-ldc.lib(lifetime.obj):(_d_allocclass)
    referenced by druntime-ldc.lib(lifetime.obj):(_D2rt8lifetime__T11_d_newclassVbi0ZQsFNbxC14TypeInfo_ClassZC6Object)
    referenced by druntime-ldc.lib(lifetime.obj):(_D2rt8lifetime10__blkcacheFNbNdZPS4core6memory8BlkInfo_)
    referenced by druntime-ldc.lib(lifetime.obj):(_D2rt8lifetime12__getBlkInfoFNbPvZPS4core6memory8BlkInfo_)
    referenced by druntime-ldc.lib(lifetime.obj):(_D2rt8lifetime20__insertBlkInfoCacheFNbS4core6memory8BlkInfo_PQxZv)
    referenced by druntime-ldc.lib(lifetime.obj):(_d_arrayshrinkfit)
    referenced by druntime-ldc.lib(lifetime.obj):(_d_arrayshrinkfit)
    referenced by druntime-ldc.lib(lifetime.obj):(_d_arraysetcapacity)
    referenced by druntime-ldc.lib(lifetime.obj):(_d_arraysetcapacity)
    referenced by druntime-ldc.lib(lifetime.obj):(_d_delarray_t)
    referenced by druntime-ldc.lib(lifetime.obj):(_d_arraysetlengthT)
    referenced by druntime-ldc.lib(lifetime.obj):(_d_arraysetlengthT)
    referenced by druntime-ldc.lib(lifetime.obj):(_d_arraysetlengthT)
    referenced by druntime-ldc.lib(lifetime.obj):(_d_arraysetlengthT)
    referenced by druntime-ldc.lib(lifetime.obj):(_d_arraysetlengthT)
    referenced by druntime-ldc.lib(lifetime.obj):(_d_arraysetlengthT)
    referenced by druntime-ldc.lib(lifetime.obj):(_d_arraysetlengthiT)
    referenced by druntime-ldc.lib(lifetime.obj):(_d_arraysetlengthiT)
    referenced by druntime-ldc.lib(lifetime.obj):(_d_arraysetlengthiT)
    referenced by druntime-ldc.lib(lifetime.obj):(_d_arraysetlengthiT)
    referenced by druntime-ldc.lib(lifetime.obj):(_d_arraysetlengthiT)
    referenced by druntime-ldc.lib(lifetime.obj):(_d_arraysetlengthiT)
    referenced by druntime-ldc.lib(lifetime.obj):(_d_arrayappendcTX)
    referenced by druntime-ldc.lib(lifetime.obj):(_d_arrayappendcTX)
    referenced by druntime-ldc.lib(lifetime.obj):(_d_arrayappendcTX)
    referenced by druntime-ldc.lib(lifetime.obj):(_d_arrayappendcTX)
    referenced by druntime-ldc.lib(lifetime.obj):(_d_arrayappendcTX)

lld-link: error: undefined symbol: free
    referenced by druntime-ldc.lib(lifetime.obj):(_D2rt8lifetime19_staticDtor_L532_C1FZv)

lld-link: error: undefined symbol: fwrite
    referenced by druntime-ldc.lib(eh_msvc.obj):(fatalerror)

lld-link: error: undefined symbol: fputc
    referenced by druntime-ldc.lib(eh_msvc.obj):(fatalerror)

lld-link: error: undefined symbol: abort
    referenced by druntime-ldc.lib(eh_msvc.obj):(fatalerror)

lld-link: error: undefined symbol: set_terminate
    referenced by druntime-ldc.lib(eh_msvc.obj):(_d_throw_exception)

lld-link: error: undefined symbol: free
    referenced by druntime-ldc.lib(eh_msvc.obj):(_d_throw_exception)
    referenced by druntime-ldc.lib(eh_msvc.obj):(_D3ldc7eh_msvc14ExceptionStack4pushMFNbC6object9ThrowableZv)
    referenced by druntime-ldc.lib(eh_msvc.obj):(_D3ldc7eh_msvc14ExceptionStack6__dtorMFNbZv)
    referenced by druntime-ldc.lib(eh_msvc.obj):(_D3ldc7eh_msvc14ExceptionStack4growMFNbZv)
    referenced by druntime-ldc.lib(eh_msvc.obj):(_D3ldc7eh_msvc14ExceptionStack8opAssignMFNbNcNjSQBuQBtQBoZQl)
    referenced by druntime-ldc.lib(eh_msvc.obj):(_D3ldc7eh_msvc12FiberContext11__fieldDtorMFNbZv)
    referenced by druntime-ldc.lib(eh_msvc.obj):(_D3ldc7eh_msvc12FiberContext8opAssignMFNbNcNjSQBsQBrQBmZQl)
    referenced by druntime-ldc.lib(eh_msvc.obj):(_d_eh_swapContext)
    referenced by druntime-ldc.lib(eh_msvc.obj):(_D3ldc7eh_msvc19_staticDtor_L552_C1FZv)

lld-link: error: undefined symbol: malloc
    referenced by druntime-ldc.lib(threadaux.obj):(_D4core3sys7windows9threadaux10thread_aux18enumProcessThreadsFkPFkPvZbQeZb)
    referenced by druntime-ldc.lib(threadaux.obj):(_D4core3sys7windows9threadaux10thread_aux18enumProcessThreadsFkPFkPvZbQeZb)

lld-link: error: too many errors emitted, stopping now (use /errorlimit:0 to see all errors)




































































































































































Error: linking with LLD failed
C:\ldc\bin\ldc2.exe failed with exit code 1.
```
April 27, 2019
Gravatar of evilratPosted by evilrat
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On Friday, 26 April 2019 at 14:20:24 UTC, dokutoku wrote:
>
> Error: linking with LLD failed
> C:\ldc\bin\ldc2.exe failed with exit code 1.
>

Ok, I have Visual Studio and SDKs installed so it works for me without touching anything else.
In your case it is using lld linker instead, and I have no idea what libs it requires.
April 29, 2019
Gravatar of KagaminPosted by Kagamin
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Kagamin
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fwrite, fputc - that's missing C library.
May 11, 2019
Gravatar of kinkePosted by kinke
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On Friday, 26 April 2019 at 05:08:32 UTC, dokutoku wrote:
> Is this a DUB or LDC bug?

It's a combination of at least 3 small bugs in the MinGW-w64 based libraries and should be fixed by https://github.com/ldc-developers/ldc/pull/3071.