[SYCL][Driver][libdevice] Link libspirv in -fsycl-device-only mode
#19136
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This was referenced Jun 25, 2025
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) <!-- start git-machete generated --> # Based on PR #18956 ## Tree of downstream PRs as of 2025-06-25 * **PR #19130 (THIS ONE)** * PR #19131 * PR #19134 * PR #19135 * PR #19136 <!-- end git-machete generated --> In the next commits I'd like to refactor and fix SYCL libspirv linking. This adds a few tests to cover the current behavior. Some of it is buggy, and not consistent between NVPTX and AMDGPU, it will be improved in the next commits.
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<!-- start git-machete generated --> # Based on PR #19130 ## Chain of upstream PRs & tree of downstream PRs as of 2025-06-25 * PR #19130 * **PR #19131 (THIS ONE)** * PR #19134 * PR #19135 * PR #19136 <!-- end git-machete generated --> Move the logic for finding and linking libspirv into SYCLInstallationDetector. This code was basically duplicated between the CUDA and HIP toolchains, and was also present in the Driver sources. This is NFC, aside from the fact that the code in the HIP toolchain lacked the special handling for the `-###` driver option present in the other two places.
Previously, the `-fsycl-device-only` mode disabled linking libspirv. `-fsycl-device-only` should produce the same LLVM-IR as `-fsycl` would, but without any host actions. Libdevice is the likely reason why this was done as is, but it should not be the default. This patch changes libdevice options to disable libspirv linking there, and enables linking by default in `-fsycl-device-only` mode.
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<!-- start git-machete generated --> # Based on PR #19131 ## Chain of upstream PRs & tree of downstream PRs as of 2025-06-25 * PR #19130 * PR #19131 * **PR #19134 (THIS ONE)** * PR #19135 * PR #19136 <!-- end git-machete generated --> ... instead of the resource directory. This matches the behaviour of SYCL device libraries. The resource directory has nothing to do with libspirv, and it might be changed by the `-resource-dir` option, which would lead us to not find it.
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Based on PR #19135
Chain of upstream PRs as of 2025-06-25
PR [SYCL][Driver] Improve SYCL libspirv linking test coverage (NFC) #19130
PR [SYCL][Driver] Deduplicate libspirv logic #19131
PR [SYCL][Driver] Base libspirv path on sycl install candidates #19134
PR [SYCL][Driver] Emit unused argument warning for -fno-libspirv #19135
-fsycl-device-onlymode #19136 (THIS ONE)Previously, the
-fsycl-device-onlymode disabled linking libspirv.-fsycl-device-onlyshould produce the same LLVM-IR as-fsyclwould,but without any host actions.
Libdevice is the likely reason why this was done as is, but it should
not be the default. This patch changes libdevice options to disable
libspirv linking there, and enables linking by default in
-fsycl-device-onlymode.