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Disable std::exception_ptr and nested_exception formatters when exceptions are disabled. (#4904)

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Fixes building with Clang 20 and older with -fno-exceptions, which treats
try/catch usage as an error.
This commit is contained in:
Jacek Caban 2026-09-07 16:13:51 +02:00 committed by GitHub
parent 2d4d8a13c2
commit c07e2aa4b1
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GPG Key ID: B5690EEEBB952194
1 changed files with 6 additions and 2 deletions
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8
include/fmt/std.h
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@ -665,7 +665,7 @@ struct formatter<
}
#endif // FMT_USE_RTTI
out = detail::write_bytes<char>(out, string_view(ex.what()));
#if FMT_USE_RTTI
#if FMT_USE_RTTI && FMT_USE_EXCEPTIONS
// If the exception carries a nested exception (e.g. via
// std::throw_with_nested), format the whole chain.
if (auto* nested = dynamic_cast<const std::nested_exception*>(&ex)) {
@ -680,7 +680,7 @@ struct formatter<
}
}
}
#endif // FMT_USE_RTTI
#endif // FMT_USE_RTTI && FMT_USE_EXCEPTIONS
return out;
}
};
@ -690,6 +690,7 @@ template <> struct formatter<std::exception_ptr> : formatter<std::exception> {
auto format(const std::exception_ptr& ep, FormatContext& ctx) const
-> decltype(ctx.out()) {
if (!ep) return this->write_padded(ctx, string_view("none"));
#if FMT_USE_EXCEPTIONS
try {
std::rethrow_exception(ep);
} catch (const std::exception& e) {
@ -697,6 +698,9 @@ template <> struct formatter<std::exception_ptr> : formatter<std::exception> {
} catch (...) {
return this->write_padded(ctx, string_view("unknown exception"));
}
#else
return this->write_padded(ctx, string_view("unknown exception"));
#endif // FMT_USE_EXCEPTIONS
}
};