Backport broken scatter/gather Signatures

Bug #1865091 reported by Axel Huebl on 2020-02-27
This bug affects 1 person
Affects Status Importance Assigned to Milestone
gcc-5 (Ubuntu)
nvidia-cuda-toolkit (Ubuntu)

Bug Description

Ubuntu 18.04 LTS ships CUDA 9.1.85 which is broken with provided GCC compilers in a slightly complex way.

By default, the g++ compiler version is 7.4.0, which is not supported by CUDA/NVCC 9.1.85.
Next, CUDA/NVCC 9.1.85 should have provided support for g++ 6. But the release overlooked an incompatibility with std::tuple which renders this compiler combination not useful either:

Consequently, users that want to use mature C++11/14 features can still switch to install a g++-5 package on Ubuntu 18.04 but this compiler has another set of bugs in signatures of gather/scatter intrinsics which were fixed in later GCC releases. This fix was unfortunately not backported to GCC 5.5 .

In order to make NVCC+GCC work together on Ubuntu 18.04, I would recommend to backport the small patches of three intrinsic files with broken signatures to the g++-5 (specifically the libgcc-5-dev) packages:

Thanks a lot for considering,

Axel Huebl (axel-huebl) on 2020-02-27
description: updated
description: updated
description: updated
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