digitalmars.D.learn - DLL creation fails with undefined symbol error
- dokutoku (5/5) Apr 25 2019 I tried to build a DLL in a Windows 64bit environment.
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?
Apr 25 2019
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.
Apr 26 2019
On Friday, 26 April 2019 at 12:37:46 UTC, evilrat wrote:On Friday, 26 April 2019 at 05:08:32 UTC, dokutoku wrote: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. ```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.
Apr 26 2019
evilrat <evilrat666 gmail.com> 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.
Apr 26 2019
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.
May 11 2019