<details open> tests : qualify isnan and signbit with std:: (#31791) * tests : qualify isnan and signbit with std:: The unqualified calls rely on the C math.h names also being present in the global namespace, which is not the case for the NetBSD 11.99.9/x86_64 gcc 14.4.0 build reported in the issue. Prefix the calls with std:: to select the standard C++ overloads declared by <cmath>. ref: https://github.com/ggml-org/ggml/issues/1681 Assisted-by: dsh:llama.cpp/ggml-org/Qwen3.8-Flash-Next-GGUF (MacBook, M5 Max, 128GB) * tests : qualify C math calls with std:: Follow-up to the isnan / signbit fix: make the remaining math calls in test-quantize-fns.cpp consistent with the std:: isfinite / max / numeric_limits already used in the same file. The float variants are overloads in C++, not distinct names, so the mapping is fabsf -> std::fabs, copysignf -> std::copysign, nextafterf -> std::nextafter - not std::fabsf & friends, which do not exist in libstdc++ and would break the gcc build. NAN and INFINITY are macros and are left unqualified. Only behavioural difference: array_rmse() fed a double accumulator to sqrtf(), now std::sqrt() keeps the computation in double. The result is more accurate and differs from the previous value by at most 1.4e-7 relative, three orders of magnitude below the tightest tolerance in this test. 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The update qualifies calls to math functions like isnan and signbit with std:: to ensure compatibility with C++ standard library overloads, addressing issues on NetBSD 11.99.9/x86_64 with gcc 14.4.0. Additional C math function calls are standardized using std:: prefixes (e.g., std::fabs, std::copysign) instead of non-existent std::fabsf variants, improving accuracy by keeping computations in double precision. The change results in a minor behavioral difference with a relative error of at most 1.4e-7, well below test tolerances.