tra added inline comments.
================
Comment at: lib/Driver/ToolChains/Cuda.cpp:170-182
- // This code prevents IsValid from being set when
- // no libdevice has been found.
- bool allEmpty = true;
- std::string LibDeviceFile;
- for (auto key : LibDeviceMap.keys()) {
- LibDeviceFile = LibDeviceMap.lookup(key);
- if (!LibDeviceFile.empty())
----------------
I'd keep this code. It appears to serve useful purpose as it requires CUDA
installation to have at least some libdevice library in it. It gives us a
change to find a valid installation, instead of ailing some time later when we
ask for a libdevice file and fail because there are none.
================
Comment at: lib/Driver/ToolChains/Cuda.cpp:556
+ DAL->AddJoinedArg(nullptr, Opts.getOption(options::OPT_march_EQ),
+ CLANG_OPENMP_NVPTX_DEFAULT_ARCH);
}
----------------
This sets default GPU arch for *everyone* based on OPENMP requirements. Perhaps
this should be predicated on this being openmp compilation.
IMO to avoid unnecessary surprises, the default for CUDA compilation should
follow defaults of nvcc. sm_30 becomes default only in CUDA-9.
https://reviews.llvm.org/D38883
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