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Fix compilation with gcc < 5 (#2956)

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When the user defines _GLIBCXX_USE_CXX11_ABI=0 to force the pre-c++11 ABI, numpy.h assumes that is_trivially_copyable is available.
It is not necessarily the case. This patch uses clang's feature detection instead.
The workaround is for certain libstdc++ versions, so the test should target these particular versions.
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mvoelkle-cern 2021-04-19 19:53:57 +02:00 committed by GitHub
parent 114be7f4ad
commit e08a58111d
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1 changed files with 5 additions and 6 deletions
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include/pybind11/numpy.h
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@ -319,14 +319,13 @@ template <typename T> using remove_all_extents_t = typename array_info<T>::type;
template <typename T> using is_pod_struct = all_of<
std::is_standard_layout<T>, // since we're accessing directly in memory we need a standard layout type
#if !defined(__GNUG__) || defined(_LIBCPP_VERSION) || defined(_GLIBCXX_USE_CXX11_ABI)
// _GLIBCXX_USE_CXX11_ABI indicates that we're using libstdc++ from GCC 5 or newer, independent
// of the actual compiler (Clang can also use libstdc++, but it always defines __GNUC__ == 4).
std::is_trivially_copyable<T>,
#else
// GCC 4 doesn't implement is_trivially_copyable, so approximate it
#if defined(__GLIBCXX__) && (__GLIBCXX__ < 20150422 || __GLIBCXX__ == 20150623 || __GLIBCXX__ == 20150626 || __GLIBCXX__ == 20160803)
// libstdc++ < 5 (including versions 4.8.5, 4.9.3 and 4.9.4 which were released after 5)
// don't implement is_trivially_copyable, so approximate it
std::is_trivially_destructible<T>,
satisfies_any_of<T, std::has_trivial_copy_constructor, std::has_trivial_copy_assign>,
#else
std::is_trivially_copyable<T>,
#endif
satisfies_none_of<T, std::is_reference, std::is_array, is_std_array, std::is_arithmetic, is_complex, std::is_enum>
>;