https://bugs.llvm.org/show_bug.cgi?id=49555
Bug ID: 49555
Summary: CUDA separable compilation support
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: CUDA
Assignee: unassignedclangb...@nondot.org
Reporter: carlosgalv...@gmail.com
CC: llvm-bugs@lists.llvm.org
Hi!
Since long time ago CUDA supports separable compilation:
https://developer.nvidia.com/blog/separate-compilation-linking-cuda-device-code/
Is this expected to be supported in Clang? The following example doesn't work:
// lib.h
__device__ int foo();
// lib.cu
#include "lib.h"
__device__ int foo()
{
return 123;
}
// main.cu
#include "lib.h"
#include <cstdio>
__global__ kernel()
{
printf("%d\n", foo());
}
int main()
{
kernel<<<1,10>>>();
cudaDeviceSynchronize();
}
Compiling with:
clang++ ... lib.cu main.cu
Gives a linker error: cannot find reference to extern function "foo".
If this is not supported out of the box, would the following procedure be
reasonable?
1) Compile object files with clang, adding -fgpu-rdc.
2) Device link them using "nvcc -dlink *.o -o device_link.o"
3) Link everything with clang: "clang *.o device_link.o"
Thanks!
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