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Workaround for incompatibility between libstdc++ consteval-based std::is_constant_evaluated() implementation and clang-14 #3281

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Jan 22, 2023
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Workaround for incompatibility between libstdc++ consteval-based std::is_constant_evaluated() implementation and clang-14 #3281

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10 changes: 9 additions & 1 deletion include/fmt/core.h
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Original file line number Diff line number Diff line change
Expand Up @@ -329,7 +329,15 @@ template <typename... T> FMT_CONSTEXPR void ignore_unused(const T&...) {}

constexpr FMT_INLINE auto is_constant_evaluated(
bool default_value = false) noexcept -> bool {
#ifdef __cpp_lib_is_constant_evaluated
// Workaround for incompatibility between libstdc++ consteval-based
// std::is_constant_evaluated() implementation and clang-14.
// https://github.com/fmtlib/fmt/issues/3247
#if FMT_CPLUSPLUS >= 202002L && defined(_GLIBCXX_RELEASE) && \
_GLIBCXX_RELEASE >= 12 && \
(FMT_CLANG_VERSION >= 1400 && FMT_CLANG_VERSION < 1500)
ignore_unused(default_value);
return __builtin_is_constant_evaluated();
#elif defined(__cpp_lib_is_constant_evaluated)
ignore_unused(default_value);
return std::is_constant_evaluated();
#else
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