windows link error

[kfpandayang]

I build this demo according to README， but ran into the following error:

c:\program files\nvidia gpu computing toolkit\cuda\v9.1\include\cuda_fp16.hpp(122): note: 参见“__half”的声明
C:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\VC\Tools\MSVC\14.13.26128\bin\HostX86\x64\link.exe /nologo /INCREMENTAL:NO /LTCG /DLL /MANIFEST:EMBED,ID=2 /MANIFESTUAC:NO "/LIBPATH:C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v9.1/lib/x64" "/LIBPATH:C:\Program Files\NVIDIA Corporation\NvToolsExt/lib/x64" /LIBPATH:C:\ProgramData\Anaconda3\lib\site-packages\torch\utils\ffi....\lib /LIBPATH:C:\ProgramData\Anaconda3\libs /LIBPATH:C:\ProgramData\Anaconda3\PCbuild\amd64 "/LIBPATH:C:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\VC\Tools\MSVC\14.13.26128\lib\x64" "/LIBPATH:C:\Program Files (x86)\Windows Kits\NETFXSDK\4.6.1\lib\um\x64" "/LIBPATH:C:\Program Files (x86)\Windows Kits\10\lib\10.0.16299.0\ucrt\x64" "/LIBPATH:C:\Program Files (x86)\Windows Kits\10\lib\10.0.16299.0\um\x64" /EXPORT:PyInit__my_lib .\Release_my_lib.obj .\Release\opensource\pytorch_windows\extension-ffi\script\src\my_lib.obj .\Release\opensource\pytorch_windows\extension-ffi\script\src\my_lib_cuda.obj /OUT:._my_lib.pyd /IMPLIB:.\Release_my_lib.lib
正在创建库 .\Release_my_lib.lib 和对象 .\Release_my_lib.exp
my_lib.obj : error LNK2001: 无法解析的外部符号 __imp_THFloatTensor_fill
my_lib.obj : error LNK2001: 无法解析的外部符号 __imp_THFloatTensor_resizeAs
my_lib.obj : error LNK2001: 无法解析的外部符号 __imp_THFloatTensor_isSameSizeAs
my_lib.obj : error LNK2001: 无法解析的外部符号 __imp_THFloatTensor_cadd
my_lib_cuda.obj : error LNK2001: 无法解析的外部符号 __imp_THCudaTensor_fill
my_lib_cuda.obj : error LNK2001: 无法解析的外部符号 "struct THCState * state" (?state@@3PEAUTHCState@@ea)
my_lib_cuda.obj : error LNK2001: 无法解析的外部符号 __imp_THCudaTensor_isSameSizeAs
my_lib_cuda.obj : error LNK2001: 无法解析的外部符号 __imp_THCudaTensor_resizeAs
my_lib_cuda.obj : error LNK2001: 无法解析的外部符号 __imp_THCudaTensor_cadd
._my_lib.pyd : fatal error LNK1120: 9 个无法解析的外部命令
Traceback (most recent call last):
File "C:\ProgramData\Anaconda3\lib\distutils_msvccompiler.py", line 519, in link
self.spawn([self.linker] + ld_args)
File "C:\ProgramData\Anaconda3\lib\distutils_msvccompiler.py", line 542, in spawn
return super().spawn(cmd)
File "C:\ProgramData\Anaconda3\lib\distutils\ccompiler.py", line 909, in spawn
spawn(cmd, dry_run=self.dry_run)
File "C:\ProgramData\Anaconda3\lib\distutils\spawn.py", line 38, in spawn
_spawn_nt(cmd, search_path, dry_run=dry_run)
File "C:\ProgramData\Anaconda3\lib\distutils\spawn.py", line 81, in _spawn_nt
"command %r failed with exit status %d" % (cmd, rc))
distutils.errors.DistutilsExecError: command 'C:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\VC\Tools\MSVC\14.13.26128\bin\HostX86\x64\link.exe' failed with exit status 1120

[kfpandayang]

I fixed the error with following step:

1. change src according to #5520

2. link against ATen.lib with the following modification to build.py:

sources = ['src/my_lib.cpp']
headers = ['src/my_lib.h']
defines = []
with_cuda = False

if torch.cuda.is_available():
print('Including CUDA code.')
sources += ['src/my_lib_cuda.cpp']
headers += ['src/my_lib_cuda.h']
defines += [('WITH_CUDA', None)]
with_cuda = True

ffi = create_extension(
'_ext.my_lib',
headers=headers,
sources=sources,
define_macros=defines,
relative_to=file,
with_cuda=with_cuda,
extra_compile_args=["-std=c99"],
libraries=["ATen"]
)

but python test.py crashed, i found it was caused by the cuda code my_lib.my_lib_add_forward_cuda(input1, input2, output) ,but how can I debug this, there is no information about the crash

[haha996]

hi, have you sort out this problem? i just got the same question as yours

[li91yang]

I got the same error. Is there anyone know how to fix it?

[li91yang]

When trying to compile C extension, I got error( VerificationError: CompileError: command 'C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\x86_amd64\cl.exe' failed with exit status 2), and tried all the methods mentioned, but all can't fix it. Is there anyone know how to fix it?
OS: Windows 10
PyTorch version: 0.4.1
How you installed PyTorch (conda, pip, source): conda
Python version: Python 3.5.6 |Anaconda, Inc.| (default, Aug 26 2018, 16:05:27) [MSC v.1900 64 bit (AMD64)] on win32
CUDA/cuDNN version: CUDA-9.0
GPU models and configuration: VS 2015

generating C:\Users\liyang\AppData\Local\Temp\tmp65k1yok8_my_lib.c
setting the current directory to 'C:\Users\liyang\AppData\Local\Temp\tmp65k1yok8'
running build_ext
building '_my_lib' extension
creating Release
creating Release\models
creating Release\models\ops
creating Release\models\ops\learn
creating Release\models\ops\learn\11
creating Release\models\ops\learn\11\src
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\x86_amd64\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -IC:\Users\liyang\Anaconda3\envs\pytorch41\lib\site-packages\torch\utils\ffi....\lib\include -IC:\Users\liyang\Anaconda3\envs\pytorch41\lib\site-packages\torch\utils\ffi....\lib\include\TH -IC:\Users\liyang\Anaconda3\pkgs\pytorch-cpu-0.4.1-py35_cpuhe774522_1\Lib\site-packages\torch\lib\include -IC:\Users\liyang\Anaconda3\envs\pytorch41\include -IC:\Users\liyang\Anaconda3\envs\pytorch41\include "-IC:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE" "-IC:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\ATLMFC\INCLUDE" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.10240.0\ucrt" "-IC:\Program Files (x86)\Windows Kits\NETFXSDK\4.6.1\include\um" "-IC:\Program Files (x86)\Windows Kits\8.1\include\shared" "-IC:\Program Files (x86)\Windows Kits\8.1\include\um" "-IC:\Program Files (x86)\Windows Kits\8.1\include\winrt" /Tc_my_lib.c /Fo.\Release_my_lib.obj -std=c99
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\x86_amd64\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -IC:\Users\liyang\Anaconda3\envs\pytorch41\lib\site-packages\torch\utils\ffi....\lib\include -IC:\Users\liyang\Anaconda3\envs\pytorch41\lib\site-packages\torch\utils\ffi....\lib\include\TH -IC:\Users\liyang\Anaconda3\pkgs\pytorch-cpu-0.4.1-py35_cpuhe774522_1\Lib\site-packages\torch\lib\include -IC:\Users\liyang\Anaconda3\envs\pytorch41\include -IC:\Users\liyang\Anaconda3\envs\pytorch41\include "-IC:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE" "-IC:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\ATLMFC\INCLUDE" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.10240.0\ucrt" "-IC:\Program Files (x86)\Windows Kits\NETFXSDK\4.6.1\include\um" "-IC:\Program Files (x86)\Windows Kits\8.1\include\shared" "-IC:\Program Files (x86)\Windows Kits\8.1\include\um" "-IC:\Program Files (x86)\Windows Kits\8.1\include\winrt" /EHsc /TpI:\D435\DepthCNN\models\ops\learn\11\src\my_lib.cpp /Fo.\Release\D435\DepthCNN\models\ops\learn\11\src\my_lib.obj -std=c99
Traceback (most recent call last):

File "C:\Users\liyang\Anaconda3\envs\pytorch41\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 668, in runfile
execfile(filename, namespace)

File "C:\Users\liyang\Anaconda3\envs\pytorch41\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 108, in execfile
exec(compile(f.read(), filename, 'exec'), namespace)

File "I:/models/ops/learn/11/build.py", line 38, in
ffi.build()

File "C:\Users\liyang\Anaconda3\envs\pytorch41\lib\site-packages\torch\utils\ffi_init_.py", line 189, in build
_build_extension(ffi, cffi_wrapper_name, target_dir, verbose)

File "C:\Users\liyang\Anaconda3\envs\pytorch41\lib\site-packages\torch\utils\ffi_init_.py", line 111, in _build_extension
outfile = ffi.compile(tmpdir=tmpdir, verbose=verbose, target=libname)

File "C:\Users\liyang\Anaconda3\envs\pytorch41\lib\site-packages\cffi\api.py", line 697, in compile
compiler_verbose=verbose, debug=debug, **kwds)

File "C:\Users\liyang\Anaconda3\envs\pytorch41\lib\site-packages\cffi\recompiler.py", line 1520, in recompile
compiler_verbose, debug)

File "C:\Users\liyang\Anaconda3\envs\pytorch41\lib\site-packages\cffi\ffiplatform.py", line 22, in compile
outputfilename = _build(tmpdir, ext, compiler_verbose, debug)

File "C:\Users\liyang\Anaconda3\envs\pytorch41\lib\site-packages\cffi\ffiplatform.py", line 58, in _build
raise VerificationError('%s: %s' % (e.class.name, e))

VerificationError: CompileError: command 'C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\x86_amd64\cl.exe' failed with exit status 2

[ChongJiao]

I meet this error too. who knows how to fix it?

[GreenTeaHua]

I meet this error too.
pytorch 0.41