diff options
Diffstat (limited to 'gnu/packages/patches/range-v3-build-with-gcc10.patch')
-rw-r--r-- | gnu/packages/patches/range-v3-build-with-gcc10.patch | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/gnu/packages/patches/range-v3-build-with-gcc10.patch b/gnu/packages/patches/range-v3-build-with-gcc10.patch new file mode 100644 index 0000000000..a5d5b33523 --- /dev/null +++ b/gnu/packages/patches/range-v3-build-with-gcc10.patch @@ -0,0 +1,122 @@ +From 0487cca29e352e8f16bbd91fda38e76e39a0ed28 Mon Sep 17 00:00:00 2001 +From: Louis Dionne <ldionne.2@gmail.com> +Date: Tue, 15 Jun 2021 14:40:01 -0400 +Subject: [PATCH] Work around broken integration with latest libc++. (#1635) + +* Work around broken integration with latest libc++. + +In newer versions of libc++, the base template of std::iterator_traits +provides a member typedef called __primary_template which is an alias +to the std::iterator_traits specialization itself. This fix works with +both the old version of libc++ and the new one. + +Fixes issue #1633. + +* Fix is_std_iterator_traits_specialized_v on MSVC + +It used to pretend that std::iterator_traits<T*> is a user-defined +specialization, which isn't the case. This is due to MSVC's +iterator_traits<T*> specialization not posing as the base template. +--- + include/std/detail/associated_types.hpp | 22 +++++++++++----- + test/CMakeLists.txt | 1 + + test/bug1633.cpp | 34 +++++++++++++++++++++++++ + 3 files changed, 51 insertions(+), 6 deletions(-) + create mode 100644 test/bug1633.cpp + +diff --git a/include/std/detail/associated_types.hpp b/include/std/detail/associated_types.hpp +index b642166d4..449a3f91c 100644 +--- a/include/std/detail/associated_types.hpp ++++ b/include/std/detail/associated_types.hpp +@@ -265,11 +265,22 @@ namespace ranges + template<typename I> + char is_std_iterator_traits_specialized_impl_(void *); + #elif defined(_LIBCPP_VERSION) +- template<typename I, bool B> +- char ( +- &is_std_iterator_traits_specialized_impl_(std::__iterator_traits<I, B> *))[2]; ++ // In older versions of libc++, the base template inherits from std::__iterator_traits<typename, bool>. ++ template<template<typename, bool> class IteratorTraitsBase, typename I, bool B> ++ char (&libcpp_iterator_traits_base_impl(IteratorTraitsBase<I, B> *))[2]; ++ template<template<typename, bool> class IteratorTraitsBase, typename I> ++ char libcpp_iterator_traits_base_impl(void *); ++ ++ // In newer versions, the base template has only one template parameter and provides the ++ // __primary_template typedef which aliases the iterator_traits specialization. ++ template<template<typename> class, typename I> ++ char (&libcpp_iterator_traits_base_impl(typename std::iterator_traits<I>::__primary_template *))[2]; ++ template<template<typename> class, typename I> ++ char libcpp_iterator_traits_base_impl(void *); ++ + template<typename I> +- char is_std_iterator_traits_specialized_impl_(void *); ++ auto is_std_iterator_traits_specialized_impl_(std::iterator_traits<I>* traits) ++ -> decltype(libcpp_iterator_traits_base_impl<std::__iterator_traits, I>(traits)); + #elif defined(_MSVC_STL_VERSION) + template<typename I> + char (&is_std_iterator_traits_specialized_impl_( +@@ -287,14 +298,13 @@ namespace ranges + RANGES_INLINE_VAR constexpr bool is_std_iterator_traits_specialized_v = + 1 == sizeof(is_std_iterator_traits_specialized_impl_<I>( + static_cast<std::iterator_traits<I> *>(nullptr))); +- ++#endif + // The standard iterator_traits<T *> specialization(s) do not count + // as user-specialized. This will no longer be necessary in C++20. + // This helps with `T volatile*` and `void *`. + template<typename T> + RANGES_INLINE_VAR constexpr bool is_std_iterator_traits_specialized_v<T *> = + false; +-#endif + } // namespace detail + /// \endcond + } // namespace ranges +diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt +index 889f314af..2c2b7c09c 100644 +--- a/test/CMakeLists.txt ++++ b/test/CMakeLists.txt +@@ -19,3 +19,4 @@ rv3_add_test(test.bug474 bug474 bug474.cpp) + rv3_add_test(test.bug566 bug566 bug566.cpp) + rv3_add_test(test.bug1322 bug1322 bug1322.cpp) + rv3_add_test(test.bug1335 bug1335 bug1335.cpp) ++rv3_add_test(test.bug1633 bug1633 bug1633.cpp) +diff --git a/test/bug1633.cpp b/test/bug1633.cpp +new file mode 100644 +index 000000000..be52420ad +--- /dev/null ++++ b/test/bug1633.cpp +@@ -0,0 +1,34 @@ ++// Range v3 library ++// ++// Use, modification and distribution is subject to the ++// Boost Software License, Version 1.0. (See accompanying ++// file LICENSE_1_0.txt or copy at ++// http://www.boost.org/LICENSE_1_0.txt) ++// ++// Project home: https://github.com/ericniebler/range-v3 ++ ++#include <cstddef> ++#include <iterator> ++#include <range/v3/iterator.hpp> ++ ++struct X { }; ++ ++namespace std { ++ template<> struct iterator_traits<X> { }; ++} ++ ++struct Y { ++ using difference_type = std::ptrdiff_t; ++ using value_type = int; ++ using pointer = int*; ++ using reference = int&; ++ using iterator_category = std::forward_iterator_tag; ++}; ++ ++static_assert(ranges::detail::is_std_iterator_traits_specialized_v<X>, ""); ++static_assert(!ranges::detail::is_std_iterator_traits_specialized_v<Y>, ""); ++static_assert(!ranges::detail::is_std_iterator_traits_specialized_v<int*>, ""); ++ ++int main() ++{ ++} |