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add support for withnvptx easyconfig parameter, to enable GPU offloading, in GCC easyblock #2235

Merged
merged 2 commits into from
Nov 17, 2020
Merged

add support for withnvptx easyconfig parameter, to enable GPU offloading, in GCC easyblock #2235

merged 2 commits into from
Nov 17, 2020

Commits on Nov 15, 2020

  1. Enable withnvptx parameter: enables GPU offloading 

    GCC supports offloading to NVidia GPUs via OpenMP and OpenACC.
To allow this via the easyblock the following strategy is used:
an iterative build with 3 steps:
0. build and install GCC as usual except adding --without-cuda-driver
   --enable-offload-targets=nvptx-none to configopts.
1. build nvptx-tools with this GCC, install in the same location
2. build and install GCC with target nvptx-none so it can compile
   NVPTX code.

Thanks to
https://gist.github.com/matthiasdiener/e318e7ed8815872e9d29feb3b9c8413f
https://sources.debian.org/src/gcc-10/10.2.0-17/debian/rules2/
https://github.com/eth-cscs/production/blob/master/easybuild/easyconfigs/g/GCCcore/GCCcore-7.3.0-cuda-9.1-offload.eb
for inspiration.

Closes easybuilders#2232
    @bartoldeman
    bartoldeman committed Nov 15, 2020
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  2. Appease the Hound

    @bartoldeman
    bartoldeman committed Nov 15, 2020
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