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IntelLLVM falls through to GCC-only flags, breaking the build and selecting unsupported Spectre mitigations. Signed-off-by: NLeeson <94591016+NLeeson@users.noreply.github.com>
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IntelLLVM was treated as GCC, causing a build failure on unsupported warning
options and selecting unsupported Spectre mitigations. Use the Clang-compatible
options for IntelLLVM while keeping vendor-specific workarounds scoped correctly.
Validated with a successful full driver build on Linux x86-64 using IntelLLVM
2026.1.1. The full ULT suite and Windows validation were not run locally.
Closes #1007