Clang - Fix use of overloaded operator '+' is ambiguous error#8516
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alsepkow merged 1 commit intoJun 8, 2026
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Wrap the bare integer literals in the DerivativeDdx/DerivativeDdy expected-result expressions in T(...) so the arithmetic resolves cleanly under clang's stricter overload resolution. Previously: `((A + 2) - (A + 0))` — `A` is of template parameter type `T` (e.g. `HLSLHalf_t`, `HLSLMin16Float_t`). `T + int` has no unambiguous overload for those wrapper types and clang rejects it; MSVC accepted via implicit-conversion ranking. Now: `((A + T(2.0f)) - (A + T(0.0f)))` — the literal is constructed as `T` first, so `operator+` resolves to the type's own implementation. The value is bit-identical to the previous code path on MSVC. No behavior change. Affects only the 4 `DEFAULT_OP_1(OpType::DerivativeDd[xy][Fine?], ...)` rows around line 1352.
V-FEXrt
approved these changes
Jun 4, 2026
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Resolve the error that shows up when compiled with Clang version 22.1.2 and newer:
"use of overloaded operator '+' is ambiguous.".Fixed by casting each literal to T (+ T(2.0f), + T(0.0f), + T(4.0f), + T(6.0f)) so the addend has the same type as the operand. This removes the overload ambiguity without changing the values being tested.
Validated locally in the OS.2020 that all related errors dropped in Clang build.