[roll] Roll fuchsia [roll] Roll llvm-project/libc [libc] Skip targets with unavailable __ONLY flags (#196637) When SKIP_FLAG_EXPANSION strips a flag that has the __ONLY modifier, remove_duplicated_flags drops the flag from the list. This leaves expand_flags_for_target with an empty flag list, causing it to create a plain (non-flag) target. The __ONLY semantics, "only build this target with the flag active", are silently violated. On x86-64 CI runners without FMA, this results in cosf_float_test and sinf_float_test being built and linked without FMA. The sincosf algorithm was tuned assuming fused multiply-add precision, so the unfused x*y+z fallback exceeds the 3.5 ULP tolerance (57 ULP for cosf, 12 ULP for sinf). Added an early return in add_target_with_flags: if any flag with the __ONLY modifier would be skipped, the target is not generated. Assisted-by: Automated tooling, human reviewed. GitOrigin-RevId: 7748bf56c178a11dc2c705d94be8a9951da62e19 Original-Revision: 0153e9e2adc7df9947039d5ff2c7e03af1a214ce Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1604217 Original-Revision: 23296343344254d4142c926f13c6437dc5f405ee GitOrigin-RevId: 4e773655937bf367aca194ac22d57d4ed3a7ff26 Change-Id: I03f91c1aadf630d79f8d2dc5ae07079a39bd5a5f
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