threadIdx undeclared identifier

Accelerated Computing CUDA CUDA Programming and Performance
1

Hi everybody!
I’m a newbie to CUDA and I have a big problem. I copy the cppIntegration project and I modify the .cu file (without modify the include headers).
The information compiler gives :

error C2065: ‘threadIdx’ undeclared identifier
error C2228: left of ‘.x’ must have class/struct/union
error C2065: ‘threadIdx’ undeclared identifier
error C2228: left of ‘.y’ must have class/struct/union
error C3861: ‘__syncthreads’: identifier not found
error C2065: ‘threadIdx’ undeclared identifier
error C2228: left of ‘.x’ must have class/struct/union
error C3861: ‘__syncthreads’: identifier not found
error C2059: sintax error: ‘<’
error C2059: sintax error: ‘<’

I don’t modify “Custom Build Rule” and “Project properties” (it sets to CUDA Build Rule v.2.3.0).
I also install CUDA vs Wizard but the result is the same.
I compile with nvcc.
Can somebody help me??
Thanks

2

if you use Visual studio, can you post compilation process information in “output” window?

If you use nvcc, then it should recognize threadIdx without including any header.

3

You may have forgotten global before the declaration

Yves

4

Hi there!
Thanks for ur attention and answers.
I fixed the problem (I don’t know how) including the follow lines in my kernel files:

#include <device_launch_parameters.h>
#include <device_functions.h>

Now I have a new problem:
When I try to compile my project on MVS 2008 I have this result:

1>------ Build started: Project: CUDAWinApp1, Configuration: Debug Win32 ------
1>Compiling…
1>nvcc fatal : Don’t know what to do with ‘SDK/C/common/lib"’
1>Compiling…
1>nvcc fatal : Don’t know what to do with ‘SDK/C/common/lib"’
1>Compiling…
1>incrocio.cpp
1>c:\cuda\include\crt/func_macro.h(50) : fatal error C1189: #error : – incorrect inclusion of a cudart header file
1>Build log was saved at “file://c:\Documents and Settings\Lapoleone\Documenti\Visual Studio 2008\Projects\CUDAWinApp1\CUDAWinApp1\Debug\BuildLog.htm”
1>CUDAWinApp1 - 1 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

with this command line:

“C:\CUDA\bin\nvcc.exe” -ccbin “C:\Programmi\Microsoft Visual Studio 9.0\VC\bin” -I"C:\CUDA\include" -I"C:\Documents and Settings\Lapoleone\Impostazioni locali\Dati applicazioni\NVIDIA Corporation\NVIDIA GPU Computing SDK\C\common\inc" -O0 -arch compute_10 -code sm_10 --host-compilation C++ -c -m 32 --library “C:\CUDA\lib” --library "C:\Documents and Settings\Lapoleone\Impostazioni locali\Dati applicazioni\NVIDIA Corporation\NVIDIA GPU Computing SDK\C\common\lib" -o “Debug\CUDAWinApp1.obj” -odir “Debug” -ext none -int real “c:\Documents and Settings\Lapoleone\Documenti\Visual Studio 2008\Projects\CUDAWinApp1\CUDAWinApp1\CUDAWinApp1.vcproj”

if i try to compile my two cuda files separately on windows prompt i get this other result:

C:\CUDA\bin>nvcc -ccbin “C:\Programmi\Microsoft Visual Studio 9.0\VC\bin” -I “C:\CUDA\include” -I “C:\Documents and
Settings\Lapoleone\Impostazioni locali\Dati applicazioni\NVIDIA Corporation\NVIDIA GPU Computing SDK\C\common\inc”
–library "C:\CUDA\lib" --library “C:\Documents and Settings\Lapoleone\Impostazioni locali\Dati applicazioni\NVID
IA Corporation\NVIDIA GPU Computing SDK\C\common\lib” -o “C:\Documents and Settings\Lapoleone\Documenti\Visual Stud
io 2008\Projects\CUDAWinApp1\CUDAWinApp1\Debug\cppIntegration.obj” -int real -c “C:\Documents and Settings\Lapoleon
e\Documenti\Visual Studio 2008\Projects\CUDAWinApp1\CUDAWinApp1\cppIntegration.cu”
nvcc fatal : Don’t know what to do with ‘Studio’

I have no idea.
I couldn’t find anything on Google.
Can you help me???

5

That is not a solution, you are just hiding your error and pusing it to appear later.

It seems for some reason the compiler is dropping quotation marks and has problems with directories containing a space? (Look at the generated errors! - what is SDK/C/common/lib ? And what is “Studio”?)

Also, why do you include func_macro.h in your incrocio.cpp file? Are you sure it shouldn’t be incrocio.cu?

6

yes i’m sure. incrocio must be .cpp. it includes a lot of useful functions for my cuda file.

That’s the problem!!! I have no idea how to resolve it. I think it’s really strange.

7

But it does not have anything cuda-specyfic? No kernels, anything?

8

i have a cuda host file and a cuda kernel file.

they call incrocio.cpp functions.