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Generally, when no fsycl is given and a SYCL-specific option is passed by the user, we error out (e.g. as is the case with -fsycl-targets). -sycl-std is a known exception, however:

clang++ test.cpp -sycl-std=2017 -### 2>&1 | grep sycl-std

will show the option's presence in the FE call. It doesn't seem to affect the compilation, therefore is a minor issue by itself.

We should revise the list of SYCL-specific options, making sure that those affecting the compilation require -fsycl, and the less critical ones are ignored with a warning.