Hi Jakub,

The last version of this patch was slightly adapted to the latest changes of the
device-specific environment variable syntax
(https://gcc.gnu.org/pipermail/gcc-patches/2022-September/601145.html), also
considering the latest related bug fixes (commits 994ea892bd02d and 7d37c7f67c1bb).

The new patch version was bootstrapped and tested on x86_64-linux with nvptx and
amdgcn offloading without regressions.

Marcel
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