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Avoid LNK2001 in c++20 when /GL (Whole program optimization) is ON with MSVC #5939

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Avoid LNK2001 in c++20 when /GL (Whole program optimization) is ON with MSVC #5939

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12 changes: 10 additions & 2 deletions include/pybind11/pybind11.h
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Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,12 @@ PYBIND11_WARNING_DISABLE_CLANG("-Wgnu-zero-variadic-macro-arguments")
# include <cxxabi.h>
#endif

#if defined(__cpp_if_constexpr) && __cpp_if_constexpr >= 201606
# define PYBIND11_MAYBE_CONSTEXPR constexpr
#else
# define PYBIND11_MAYBE_CONSTEXPR
#endif

PYBIND11_NAMESPACE_BEGIN(PYBIND11_NAMESPACE)

/* https://stackoverflow.com/questions/46798456/handling-gccs-noexcept-type-warning
Expand Down Expand Up @@ -3606,13 +3612,15 @@ function get_override(const T *this_ptr, const char *name) {
auto o = override(__VA_ARGS__); \
PYBIND11_WARNING_PUSH \
PYBIND11_WARNING_DISABLE_MSVC(4127) \
if (pybind11::detail::cast_is_temporary_value_reference<ret_type>::value \
if PYBIND11_MAYBE_CONSTEXPR ( \
pybind11::detail::cast_is_temporary_value_reference<ret_type>::value \
&& !pybind11::detail::is_same_ignoring_cvref<ret_type, PyObject *>::value) { \
static pybind11::detail::override_caster_t<ret_type> caster; \
return pybind11::detail::cast_ref<ret_type>(std::move(o), caster); \
} else { \
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@rwgk rwgk Dec 21, 2025

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Do we need the else here? The other if branch ends with a return, the else seems redundant.

I think it'd be slightly better to leave the code down here as-is, in part because the PYBIND11_WARNING_POP is then before the return below.

return pybind11::detail::cast_safe<ret_type>(std::move(o)); \
} \
PYBIND11_WARNING_POP \
return pybind11::detail::cast_safe<ret_type>(std::move(o)); \
} \
} while (false)

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