CODEWITHSUNDEEP
c++visual-studio-2010cuda
Alatriste
Alatriste

Reputation: 567

CUDA syntax error '<'

in my test.cu file (cu file item type is CUDA C/C++)

__global__ void foo()
{
}

void CudaMain()
{

  foo<<<1,1>>>();
}

and in my test.cpp file 

#include "mycuda.cu"

int main()
{

CudaMain();
return 0;

}

and compilator send me error "error c2059 syntax error ' <' " in test.cu file

Upvotes: 16

Views: 14959

Answers (3)

marko1777
marko1777

Reputation: 111

Based on the thread here: https://forums.developer.nvidia.com/t/cuda-build-error/52615/4

Your test file extension should be .cu as well, but if you're using MSCV rename does not enough you should create a new CUDA C/C++ source module in your VS project.

Also you should put spaces between the <> operators like.

foo< < <1,1> > >();

Because C++ cannot parse the <<<>>>.

Upvotes: 6

Edd Inglis
Edd Inglis

Reputation: 1115

I know this is an old question but I was searching around and it jogged my memory for a solution that hasn't been mentioned.

The nvcc help offers:

--x {c|c++|cu}                             (-x)
        Explicitly specify the language for the input files, rather than letting
        the compiler choose a default based on the file name suffix.
        Allowed values for this option:  'c','c++','cu'.

So although it's a bit of a blunt tool, you can do:

nvcc my_source.cpp -x cu ...

and it'll compile the .cpp as if it was named .cu (ie as CUDA).

Upvotes: 2

Hristo Iliev
Hristo Iliev

Reputation: 74485

Inclusion of CUDA source files in a C++ file doesn't work because this simply makes the CUDA source part of the C++ program code and regular C++ compilers do not understand CUDA syntax extensions. If you still want to keep your CUDA code separate from the non-CUDA C++ code, then you might want to look into separate compilation. CUDA source code can be compiled to regular object files, that can then be linked with other object files to produce an executable.

Modify the C++ code to read:

extern void CudaMain(void);

int main()
{
    CudaMain();
    return 0;
}

Compile the CUDA file with nvcc, the C++ code with your C++ compiler and then link the resulting object files with nvcc (you may also need to specify the standard C++ library in the link command):

$ nvcc -c -o test_cuda.o test.cu
$ g++ -c -o test_cpp.o test.cpp
$ nvcc -o test.exe test_cuda.o test_cpp.o -lstdc++

Edit: your question is about VS2010. May be you have to create custom build steps there.

Upvotes: 4

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