Hahnfeld added inline comments.

================
Comment at: test/Driver/openmp-offload-gpu.c:150
+/// bitcode library and add it to the LIBRARY_PATH.
+// RUN:   touch %T/libomptarget-nvptx-sm_60.bc
+// RUN:   env LIBRARY_PATH=%T %clang -### -fopenmp=libomp 
-fopenmp-targets=nvptx64-nvidia-cuda \
----------------
gtbercea wrote:
> gtbercea wrote:
> > Hahnfeld wrote:
> > > grokos wrote:
> > > > ABataev wrote:
> > > > > Create empty `libomptarget-nvptx-sm_60.bc` in `Driver/lib` directory 
> > > > > and use it in the test rather create|delete it dynamically.
> > > > I'm also in favour of this approach. On some systems /tmp is not 
> > > > accessible and the regression test fails.
> > > This test doesn't (and shouldn't!) use `/tmp`. The build directory and 
> > > `%T` are always writable (if not, you have different issues on your 
> > > system).
> > > 
> > > Btw you need to pay attention that the driver now finds files next to the 
> > > compiler directory. You may want to make sure that the test always passes 
> > > / doesn't fail for wrong reasons.
> > Just added this.
> @Hahnfeld I've used %S instead.
> 
> The only way in which the test can be a false positive is when the lib folder 
> contains this .bc file. But there's no way to stop this from happening since 
> we check DefaultLibPath first.
(My comment was related to @grokos, the usage of `%T` and temporarily creating 
the bc lib. The current approach with `%S/Inputs` is much cleaner, but you need 
to create a subdirectory as everbody else did.)

Then you need to find a way to stop this. There already are some flags to 
change the sysroot etc., but I don't know if the influence what you use in this 
patch. In the worst case, you need to add a new flag to disable 
`DefaultLibPath` and use it in the tests. You can't propose to commit a test 
that is known to break (although I acknowledge that 
`libomptarget-nvptx-sm_20.bc` will probably never exist).


Repository:
  rC Clang

https://reviews.llvm.org/D43197



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