[Bug libgomp/105042] [libgomp, GOMP_NVPTX_JIT=-O0] Openacc testsuite failures when X runs on nvidia driver

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105042

--- Comment #5 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #1)
> Doesn't whatever driver/library API we use from libgomp to invoke workloads
> report actual errors?  Maybe we need to improve there.

This:
...
libgomp: cuStreamSynchronize error: the launch timed out and was terminated
...
seems to be the string for cudaErrorLaunchTimeout, which AFAICT is dedicated to
this situation, so we could treat that error code specially in cuda_error in
plugin-nvptx.c and emit a custom message.

Say:
...
libgomp: cuStreamSynchronize error: the launch timed out and was terminated (5
second time-out caused by launching on a device running a display manager)
...

Alternatively, we could detect cudaDeviceProp::kernelExecTimeoutEnabled and
emit a warning when initializing or before launching the first kernel.