[PATCH] D14370: [doc] Compile CUDA with LLVM

[Jingyue Wu via llvm-commits]

jingyue added inline comments.

================
Comment at: docs/CompileCudaWithLLVM.rst:207
@@ +206,3 @@
+
+     $ clang++ -I<CUDA install path>/include -I<CUDA install path>/samples/common/inc -L<CUDA install path>/<lib64 or lib> axpy.cc -lcudart_static -lcuda -ldl -lrt -pthread
+
----------------
tra wrote:
> You can pass device-side PTX to the host's cc1 with "-fcuda-include-gpubinary axpy.ptx"
> and clang will embed PTX into host object file and will generate code to register kernels so that kernels can be launched with <<<...>>> without any additional steps.
> 
> 
Can you clarify how to do this? I tried using `-Xclang` to set the `-fcuda-include-gpubinary` flag, but got the following. 

```
$ clang++ -Xclang -fcuda-include-gpubinary -Xclang axpy.ptx axpy.cc -I$CUDA_ROOT/include -I$CUDA_ROOT/samples/common/inc -L$CUDA_ROOT/lib64 -lcudart_static -lcuda -ldl -lrt -pthread
axpy.cc:39:3: error: use of undeclared identifier 'axpy'
  axpy<<<1, kDataLen>>>(a, device_x, device_y);
  ^
axpy.cc:39:9: error: expected expression
  axpy<<<1, kDataLen>>>(a, device_x, device_y);
        ^
axpy.cc:39:23: error: expected expression
  axpy<<<1, kDataLen>>>(a, device_x, device_y);
                      ^
axpy.cc:39:25: warning: expression result unused [-Wunused-value]
  axpy<<<1, kDataLen>>>(a, device_x, device_y);
                        ^
axpy.cc:39:28: warning: expression result unused [-Wunused-value]
  axpy<<<1, kDataLen>>>(a, device_x, device_y);
                           ^~~~~~~~
2 warnings and 3 errors generated.
```


http://reviews.llvm.org/D14370