[Driver] Clang :: Driver/sycl-device-lib.cpp fails if libdevice project is not pre-built

[bader]

Describe the bug
Clang :: Driver/sycl-device-lib.cpp has a dependency on libdevice libraries. It seems to me, that driver schedules different actions based on presence of libdevice libraries. If libraries are missing some actions are skipped, but test passes only if required libraries are present.

To Reproduce
Checkout sycl branch, configure build files and build check-clang target. It's important to not build libdevice target or any other target building libdevice (e.g. check-sycl) before building check-clang.

Environment (please complete the following information):

• OS: Linux

[bader]

@jinge90, it looks like the is not fixed. There were two commits recently breaking SYCL project build, which impacted check-clang results. Clang :: Driver/sycl-device-lib.cpp still fails if libdevice project is not built.
Could you take a look, please?
See https://github.com/intel/llvm/runs/2738419633?check_suite_focus=true and https://github.com/intel/llvm/runs/2740297660?check_suite_focus=true for details.

[jinge90]

@jinge90, it looks like the is not fixed. There were two commits recently breaking SYCL project build, which impacted check-clang results. Clang :: Driver/sycl-device-lib.cpp still fails if libdevice project is not built.
Could you take a look, please?
See https://github.com/intel/llvm/runs/2738419633?check_suite_focus=true and https://github.com/intel/llvm/runs/2740297660?check_suite_focus=true for details.

Hi, @bader
It looks weird, I just built the latest compiler and removed all libdevice binary, the sycl-device-lib.cpp can still pass with all the libdevice binary removed.
Can I log in the machine to have a look or can anyone provide the file list in compiler library folder from the failed SYCL project?
Thanks very much.

[bader]

I think this issue should be reproducible from clean state (i.e. when build directory is removed):

1. run configure.py + check-clang before building other targets.
2. or maybe make/ninja clean + check-clang will work.

Anyway the steps from post-commit will work if you checkout 70281ea.

Can I log in the machine to have a look or can anyone provide the file list in compiler library folder from the failed SYCL project?

Please, contact @tfzhu or @DoyleLi, if you won't be able to reproduce it locally.