https://llvm.org/bugs/show_bug.cgi?id=26343
Bug ID: 26343
Summary: Cuda: Relocatable device code doesn't work
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: crtr...@sandia.gov
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 15733
--> https://llvm.org/bugs/attachment.cgi?id=15733&action=edit
Reproduction code
With nvcc one can use the option "-rdc true", to allow device (or device host)
functions to be declared "extern". This means device functions can be compiled
in one compilation unit and called from others. This doesn't work here:
Error:
[crtrott@apollo test_relocatable_device_code]$ ./build_clang
ptxas fatal : Unresolved extern function '_Z4calcv'
fatal error: cannot open file '/tmp/main-b2a94f.fatbin': No such file or
directory
1 error generated.
clang-3.9: error: ptxas command failed with exit code 255 (use -v to see
invocation)
clang-3.9: error: no such file or directory: 'main.o'
Code:
extern int __device__ calc();
__global__ void foo(int* a) {
a[blockIdx.x*blockDim.x+threadIdx.x] = calc();
}
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