Intel® DPC++ Compatibility Tool Developer Guide and Reference
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DPCT1031
Message
Memory access across peer devices is an implementation-specific feature which may not be supported by some SYCL backends and compilers. The output parameter(s) are set to 0. You can migrate the code with peer access extension if you do not specify -no-dpcpp-extensions=peer_access.
Detailed Help
Memory access across peer devices is an implementation-specific feature which may not be supported by some SYCL* backends and compilers. The output parameter(s) are set to 0. You can migrate the code with peer access extension by default without specifying -no-dpcpp-extensions=peer_access.
Visit the Migrating to SYCL forum for additional help.
Suggestions to Fix
Migrate the code with peer access extension by not specifying -no-dpcpp-extensions=peer_access.