Backport fix for no matching constructorkirkstone-clang12

Fixes:
   ../../chrome/common/extensions/chrome_manifest_url_handlers.cc:101:7:
   error: no matching constructor for initialization of 'std::map<const char *, std::reference_wrapper<const absl::optionalstd::string>>' (aka 'map<const char , reference_wrapper<const optional<basic_string>>>')
std::map<const char,

as seen with chromium-109:
   https://github.com/OSSystems/meta-browser/issues/674

Thanks to Raphael Kubo da Costa for finding the commit to be backported!

Signed-off-by: Randy MacLeod <Randy.MacLeod@windriver.com>

2 files changed, 380 insertions, 0 deletions

diff --git a/recipes-devtools/clang/clang/0031-libc-LWG2993-reference_wrapper-T-conversion-from-U.patch b/recipes-devtools/clang/clang/0031-libc-LWG2993-reference_wrapper-T-conversion-from-U.patch
new file mode 100644
index 0000000..aa9b2e7
--- /dev/null
+++ b/recipes-devtools/clang/clang/0031-libc-LWG2993-reference_wrapper-T-conversion-from-U.patch
@@ -0,0 +1,379 @@
+From eec04092d67b94f47439a9065b6bd4cd60165be2 Mon Sep 17 00:00:00 2001
+From: Arthur O'Dwyer <arthur.j.odwyer@gmail.com>
+Date: Sat, 5 Dec 2020 19:37:41 -0500
+Subject: [PATCH] [libc++] [LWG2993] reference_wrapper<T> conversion from U&&
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Implement the resolution of LWG2993. Replace a deleted constructor
+with a constructor that SFINAEs away in appropriate circumstances.
+Also, now that the constructor is templated, we must have an
+explicit deduction guide to make CTAD work.
+
+Some tests have been merged in from Agustín Bergé's D40259.
+
+Differential Revision: https://reviews.llvm.org/D92725
+
+Upstream-Status: Backport
+
+---
+ libcxx/docs/Cxx2aStatusIssuesStatus.csv       |  2 +-
+ libcxx/include/__functional_base              | 21 ++++-
+ libcxx/include/functional                     |  7 +-
+ .../refwrap.assign/copy_assign.pass.cpp       | 20 +++++
+ .../refwrap/refwrap.const/deduct.pass.cpp     | 31 +++++++
+ .../refwrap.const/type_conv_ctor.pass.cpp     | 81 +++++++++++++++++++
+ .../refwrap.const/type_conv_ctor2.pass.cpp    | 61 ++++++++++++++
+ .../refwrap/refwrap.const/type_ctor.pass.cpp  | 17 ++++
+ 8 files changed, 234 insertions(+), 6 deletions(-)
+ create mode 100644 libcxx/test/std/utilities/function.objects/refwrap/refwrap.const/deduct.pass.cpp
+ create mode 100644 libcxx/test/std/utilities/function.objects/refwrap/refwrap.const/type_conv_ctor.pass.cpp
+ create mode 100644 libcxx/test/std/utilities/function.objects/refwrap/refwrap.const/type_conv_ctor2.pass.cpp
+
+diff --git a/libcxx/docs/Cxx2aStatusIssuesStatus.csv b/libcxx/docs/Cxx2aStatusIssuesStatus.csv
+index d2adde69d9d2..b411f12d0ce3 100644
+--- a/libcxx/docs/Cxx2aStatusIssuesStatus.csv
++++ b/libcxx/docs/Cxx2aStatusIssuesStatus.csv
+@@ -35,7 +35,7 @@
+ "`2981 <https://wg21.link/LWG2981>`__","Remove redundant deduction guides from standard library","Albuquerque","",""
+ "`2982 <https://wg21.link/LWG2982>`__","Making size_type consistent in associative container deduction guides","Albuquerque","",""
+ "`2988 <https://wg21.link/LWG2988>`__","Clause 32 cleanup missed one typename","Albuquerque","",""
+-"`2993 <https://wg21.link/LWG2993>`__","reference_wrapper<T> conversion from T&&","Albuquerque","",""
++"`2993 <https://wg21.link/LWG2993>`__","reference_wrapper<T> conversion from T&&","Albuquerque","|Complete|","13.0"
+ "`2998 <https://wg21.link/LWG2998>`__","Requirements on function objects passed to {``forward_``,}list-specific algorithms","Albuquerque","|Nothing To Do|",""
+ "`3001 <https://wg21.link/LWG3001>`__","weak_ptr::element_type needs remove_extent_t","Albuquerque","",""
+ "`3024 <https://wg21.link/LWG3024>`__","variant's copies must be deleted instead of disabled via SFINAE","Albuquerque","|Complete|",""
+diff --git a/libcxx/include/__functional_base b/libcxx/include/__functional_base
+index 1c02e960d5f0..caa746036bf5 100644
+--- a/libcxx/include/__functional_base
++++ b/libcxx/include/__functional_base
+@@ -380,13 +380,24 @@ public:
+ private:
+     type* __f_;
+ 
++#ifndef _LIBCPP_CXX03_LANG
++    static void __fun(_Tp&) _NOEXCEPT;
++    static void __fun(_Tp&&) = delete;
++#endif
++
+ public:
+     // construct/copy/destroy
+-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
++#ifdef _LIBCPP_CXX03_LANG
++    _LIBCPP_INLINE_VISIBILITY
+     reference_wrapper(type& __f) _NOEXCEPT
+         : __f_(_VSTD::addressof(__f)) {}
+-#ifndef _LIBCPP_CXX03_LANG
+-    private: reference_wrapper(type&&); public: // = delete; // do not bind to temps
++#else
++    template <class _Up, class = _EnableIf<!__is_same_uncvref<_Up, reference_wrapper>::value, decltype(__fun(_VSTD::declval<_Up>())) >>
++    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
++    reference_wrapper(_Up&& __u) _NOEXCEPT_(noexcept(__fun(_VSTD::declval<_Up>()))) {
++        type& __f = static_cast<_Up&&>(__u);
++        __f_ = _VSTD::addressof(__f);
++    }
+ #endif
+ 
+     // access
+@@ -511,6 +522,10 @@ public:
+ #endif // _LIBCPP_CXX03_LANG
+ };
+ 
++#ifndef _LIBCPP_HAS_NO_DEDUCTION_GUIDES
++template <class _Tp>
++reference_wrapper(_Tp&) -> reference_wrapper<_Tp>;
++#endif
+ 
+ template <class _Tp>
+ inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
+diff --git a/libcxx/include/functional b/libcxx/include/functional
+index 67baa5bd4b77..f8565e7e6e67 100644
+--- a/libcxx/include/functional
++++ b/libcxx/include/functional
+@@ -42,8 +42,8 @@ public:
+     typedef see below result_type; // Not always defined
+ 
+     // construct/copy/destroy
+-    reference_wrapper(T&) noexcept;
+-    reference_wrapper(T&&) = delete; // do not bind to temps
++    template<class U>
++      reference_wrapper(U&&);
+     reference_wrapper(const reference_wrapper<T>& x) noexcept;
+ 
+     // assignment
+@@ -59,6 +59,9 @@ public:
+           operator() (ArgTypes&&...) const;
+ };
+ 
++template <class T>
++  reference_wrapper(T&) -> reference_wrapper<T>;
++
+ template <class T> reference_wrapper<T> ref(T& t) noexcept;
+ template <class T> void ref(const T&& t) = delete;
+ template <class T> reference_wrapper<T> ref(reference_wrapper<T>t) noexcept;
+diff --git a/libcxx/test/std/utilities/function.objects/refwrap/refwrap.assign/copy_assign.pass.cpp b/libcxx/test/std/utilities/function.objects/refwrap/refwrap.assign/copy_assign.pass.cpp
+index f82ee72de915..5058a7477581 100644
+--- a/libcxx/test/std/utilities/function.objects/refwrap/refwrap.assign/copy_assign.pass.cpp
++++ b/libcxx/test/std/utilities/function.objects/refwrap/refwrap.assign/copy_assign.pass.cpp
+@@ -21,6 +21,12 @@ class functor1
+ {
+ };
+ 
++struct convertible_to_int_ref {
++    int val = 0;
++    operator int&() { return val; }
++    operator int const&() const { return val; }
++};
++
+ template <class T>
+ void
+ test(T& t)
+@@ -56,5 +62,19 @@ int main(int, char**)
+     const int j = 0;
+     test(j);
+ 
++#if TEST_STD_VER >= 11
++    convertible_to_int_ref convi;
++    test(convi);
++    convertible_to_int_ref const convic;
++    test(convic);
++
++    {
++    using Ref = std::reference_wrapper<int>;
++    static_assert((std::is_assignable<Ref&, int&>::value), "");
++    static_assert((!std::is_assignable<Ref&, int>::value), "");
++    static_assert((!std::is_assignable<Ref&, int&&>::value), "");
++    }
++#endif
++
+   return 0;
+ }
+diff --git a/libcxx/test/std/utilities/function.objects/refwrap/refwrap.const/deduct.pass.cpp b/libcxx/test/std/utilities/function.objects/refwrap/refwrap.const/deduct.pass.cpp
+new file mode 100644
+index 000000000000..4e197e8fc3f3
+--- /dev/null
++++ b/libcxx/test/std/utilities/function.objects/refwrap/refwrap.const/deduct.pass.cpp
+@@ -0,0 +1,31 @@
++//===----------------------------------------------------------------------===//
++//
++// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
++// See https://llvm.org/LICENSE.txt for license information.
++// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
++//
++//===----------------------------------------------------------------------===//
++
++// UNSUPPORTED: c++03, c++11, c++14
++// UNSUPPORTED: libcpp-no-deduction-guides
++
++// <functional>
++
++// template <class T>
++//   reference_wrapper(T&) -> reference_wrapper<T>;
++
++#include <functional>
++
++int main()
++{
++    int i = 0;
++    std::reference_wrapper ri(i);
++    static_assert(std::is_same_v<decltype(ri), std::reference_wrapper<int>>);
++    std::reference_wrapper ri2(ri);
++    static_assert(std::is_same_v<decltype(ri2), std::reference_wrapper<int>>);
++    const int j = 0;
++    std::reference_wrapper rj(j);
++    static_assert(std::is_same_v<decltype(rj), std::reference_wrapper<const int>>);
++    std::reference_wrapper rj2(rj);
++    static_assert(std::is_same_v<decltype(rj2), std::reference_wrapper<const int>>);
++}
+diff --git a/libcxx/test/std/utilities/function.objects/refwrap/refwrap.const/type_conv_ctor.pass.cpp b/libcxx/test/std/utilities/function.objects/refwrap/refwrap.const/type_conv_ctor.pass.cpp
+new file mode 100644
+index 000000000000..d8ad18215fb7
+--- /dev/null
++++ b/libcxx/test/std/utilities/function.objects/refwrap/refwrap.const/type_conv_ctor.pass.cpp
+@@ -0,0 +1,81 @@
++//===----------------------------------------------------------------------===//
++//
++// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
++// See https://llvm.org/LICENSE.txt for license information.
++// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
++//
++//===----------------------------------------------------------------------===//
++
++// UNSUPPORTED: c++03
++
++// <functional>
++//
++// reference_wrapper
++//
++// template <class U>
++//   reference_wrapper(U&&) noexcept(see below);
++
++#include <functional>
++#include <cassert>
++
++struct convertible_to_int_ref {
++    int val = 0;
++    operator int&() { return val; }
++    operator int const&() const { return val; }
++};
++
++template <bool IsNothrow>
++struct nothrow_convertible {
++    int val = 0;
++    operator int&() noexcept(IsNothrow) { return val; }
++};
++
++struct convertible_from_int {
++    convertible_from_int(int) {}
++};
++
++void meow(std::reference_wrapper<int>) {}
++void meow(convertible_from_int) {}
++
++int gi;
++std::reference_wrapper<int> purr() { return gi; };
++
++template <class T>
++void
++test(T& t)
++{
++    std::reference_wrapper<T> r(t);
++    assert(&r.get() == &t);
++}
++
++void f() {}
++
++int main()
++{
++    convertible_to_int_ref convi;
++    test(convi);
++    convertible_to_int_ref const convic;
++    test(convic);
++
++    {
++    using Ref = std::reference_wrapper<int>;
++    static_assert((std::is_nothrow_constructible<Ref, nothrow_convertible<true>>::value), "");
++    static_assert((!std::is_nothrow_constructible<Ref, nothrow_convertible<false>>::value), "");
++    }
++
++    {
++    meow(0);
++    (true) ? purr() : 0;
++    }
++
++#ifdef __cpp_deduction_guides
++    {
++    int i = 0;
++    std::reference_wrapper ri(i);
++    static_assert((std::is_same<decltype(ri), std::reference_wrapper<int>>::value), "" );
++    const int j = 0;
++    std::reference_wrapper rj(j);
++    static_assert((std::is_same<decltype(rj), std::reference_wrapper<const int>>::value), "" );
++    }
++#endif
++}
+diff --git a/libcxx/test/std/utilities/function.objects/refwrap/refwrap.const/type_conv_ctor2.pass.cpp b/libcxx/test/std/utilities/function.objects/refwrap/refwrap.const/type_conv_ctor2.pass.cpp
+new file mode 100644
+index 000000000000..debdc12c8588
+--- /dev/null
++++ b/libcxx/test/std/utilities/function.objects/refwrap/refwrap.const/type_conv_ctor2.pass.cpp
+@@ -0,0 +1,61 @@
++//===----------------------------------------------------------------------===//
++//
++// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
++// See https://llvm.org/LICENSE.txt for license information.
++// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
++//
++//===----------------------------------------------------------------------===//
++
++// UNSUPPORTED: c++03
++
++// <functional>
++//
++// reference_wrapper
++//
++// template <class U>
++//   reference_wrapper(U&&);
++
++#include <functional>
++#include <cassert>
++
++struct B {} b;
++
++struct A1 {
++    operator B& () const { return b; }
++};
++struct A2 {
++    operator B& () const noexcept { return b; }
++};
++
++int main()
++{
++    {
++    std::reference_wrapper<B> b1 = A1();
++    assert(&b1.get() == &b);
++    b1 = A1();
++    assert(&b1.get() == &b);
++
++    static_assert(std::is_convertible<A1, std::reference_wrapper<B>>::value, "");
++    static_assert(!std::is_nothrow_constructible<std::reference_wrapper<B>, A1>::value, "");
++#if TEST_STD_VER >= 20
++    static_assert(!std::is_nothrow_convertible_v<A1, std::reference_wrapper<B>>);
++#endif
++    static_assert(std::is_assignable<std::reference_wrapper<B>, A1>::value, "");
++    static_assert(!std::is_nothrow_assignable<std::reference_wrapper<B>, A1>::value, "");
++    }
++
++    {
++    std::reference_wrapper<B> b2 = A2();
++    assert(&b2.get() == &b);
++    b2 = A2();
++    assert(&b2.get() == &b);
++
++    static_assert(std::is_convertible<A2, std::reference_wrapper<B>>::value, "");
++    static_assert(std::is_nothrow_constructible<std::reference_wrapper<B>, A2>::value, "");
++#if TEST_STD_VER >= 20
++    static_assert(std::is_nothrow_convertible_v<A2, std::reference_wrapper<B>>);
++#endif
++    static_assert(std::is_assignable<std::reference_wrapper<B>, A2>::value, "");
++    static_assert(std::is_nothrow_assignable<std::reference_wrapper<B>, A2>::value, "");
++    }
++}
+diff --git a/libcxx/test/std/utilities/function.objects/refwrap/refwrap.const/type_ctor.pass.cpp b/libcxx/test/std/utilities/function.objects/refwrap/refwrap.const/type_ctor.pass.cpp
+index 4d536a20411d..af2273452612 100644
+--- a/libcxx/test/std/utilities/function.objects/refwrap/refwrap.const/type_ctor.pass.cpp
++++ b/libcxx/test/std/utilities/function.objects/refwrap/refwrap.const/type_ctor.pass.cpp
+@@ -14,6 +14,7 @@
+ 
+ #include <functional>
+ #include <cassert>
++#include <type_traits>
+ 
+ #include "test_macros.h"
+ 
+@@ -43,5 +44,21 @@ int main(int, char**)
+     const int j = 0;
+     test(j);
+ 
++    {
++    using Ref = std::reference_wrapper<int>;
++    static_assert((std::is_constructible<Ref, int&>::value), "");
++    static_assert((!std::is_constructible<Ref, int>::value), "");
++    static_assert((!std::is_constructible<Ref, int&&>::value), "");
++    }
++
++#if TEST_STD_VER >= 11
++    {
++    using Ref = std::reference_wrapper<int>;
++    static_assert((std::is_nothrow_constructible<Ref, int&>::value), "");
++    static_assert((!std::is_nothrow_constructible<Ref, int>::value), "");
++    static_assert((!std::is_nothrow_constructible<Ref, int&&>::value), "");
++    }
++#endif
++
+   return 0;
+ }
+-- 
+2.34.1
+
diff --git a/recipes-devtools/clang/common.inc b/recipes-devtools/clang/common.inc
index 9de7674..75bdb19 100644
--- a/recipes-devtools/clang/common.inc
+++ b/recipes-devtools/clang/common.inc
@@ -39,6 +39,7 @@ SRC_URI = "\
     file://0028-llvm-Do-not-use-find_library-for-ncurses.patch \
     file://0029-llvm-Recognize-yoe-and-poky-as-OE-distro.patch \
     file://0030-compiler-rt-Use-mcr-based-barrier-on-armv6.patch \
+    file://0031-libc-LWG2993-reference_wrapper-T-conversion-from-U.patch \
 "
 # Fallback to no-PIE if not set
 GCCPIE ??= ""