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# Motivation This PR aims to maintain backward compatibility when building PyTorch XPU with the old and new compilers. # Additional Context The details are described here. The new compiler (2025.0.0) has some breaking changes compared with the old compiler(2024.1), for examples: 1. On Windows, sycl library is named `sycl7.lib` in the old compiler but is named `sycl.lib` in the new compiler. 2. On Linux, in order to support ABI=0, we have to link `libsycl-preview.so` in the old compiler but we could link `libsycl.so` in the new compiler to have the same ABI compatibility. 3. We added a macro `SYCL_COMPILER_VERSION` to support our new code has good backward compatibility with the old compiler. Now the new feature(Event elapsed_time, memory summary, and device architecture property) introduced by the new compiler will be controlled within the macro `SYCL_COMPILER_VERSION`. Pull Request resolved: https://github.com/pytorch/pytorch/pull/139258 Approved by: https://github.com/EikanWang, https://github.com/atalman, https://github.com/gujinghui