[Bug 1878760] Re: gcc-10 is selecting amdgcn target by default

[Tobias Burnus]

Regarding "So installing gcc-10-offload-amdgcn will just make gcc build
binaries for amdgcn target which can't run on nvptx target."

GCC can compile a program for multiple GPUs at the same time. Which of
them is used (nvptx or gcn or none/host fallback) is chosen at runtime.
Hence, installing gcc-10-offload-amdgcn in addition to gcc-10-offload-
nvptx should work – you will get a binary which runs on nvptx (and gcn,
but that won't affect you).

Alternatively, you can explicitly specify:
-foffload=disable (no offloading, i.e. always uses the host fallback) and
-foffload=nvptx-none (i.e. compile for nvptx [and host fallback], only)

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https://bugs.launchpad.net/bugs/1878760

Title:
  gcc-10 is selecting amdgcn target by default

Status in gcc-10 package in Ubuntu:
  Invalid

Bug description:
  While trying to offload some programs to my laptop nvidia gpu, compilation failed because gcc-10 is selecting amdgcn target by default even my laptop has not any amd graphics.
  A workaround is to use "-foffload=nvptx-none=other-flags".

  Ubuntu 20.04 x86_64

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