[gcc r12-10255] libstdc++: Explicitly default some copy ctors and assignments

[gcc r12-10255] libstdc++: Explicitly default some copy ctors and assignments

[Jonathan Wakely]

https://gcc.gnu.org/g:a389921f175c30e8ca0da38ccb79ed60cf744fd4

commit r12-10255-ga389921f175c30e8ca0da38ccb79ed60cf744fd4
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Aug 8 16:24:31 2023 +0100

    libstdc++: Explicitly default some copy ctors and assignments
    
    The standard says that the implicit copy assignment operator is
    deprecated for classes that have a user-provided copy constructor, and
    vice versa.
    
    libstdc++-v3/ChangeLog:
    
            * include/bits/new_allocator.h (__new_allocator): Define copy
            assignment operator as defaulted.
            * include/std/complex (complex<float>, complex<double>)
            (complex<long double>): Define copy constructor as defaulted.
    
    (cherry picked from commit 008e439f34d4b356825a6c9b70245143f00bd353)

Diff:
---
 libstdc++-v3/include/bits/new_allocator.h |  4 ++++
 libstdc++-v3/include/std/complex          | 12 ++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/libstdc++-v3/include/bits/new_allocator.h b/libstdc++-v3/include/bits/new_allocator.h
index 99f7a2ee51e..d066d015a9d 100644
--- a/libstdc++-v3/include/bits/new_allocator.h
+++ b/libstdc++-v3/include/bits/new_allocator.h
@@ -86,6 +86,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	_GLIBCXX20_CONSTEXPR
 	__new_allocator(const __new_allocator<_Tp1>&) _GLIBCXX_USE_NOEXCEPT { }
 
+#if __cplusplus >= 201103L
+      __new_allocator& operator=(const __new_allocator&) = default;
+#endif
+
 #if __cplusplus <= 201703L
       ~__new_allocator() _GLIBCXX_USE_NOEXCEPT { }
 
diff --git a/libstdc++-v3/include/std/complex b/libstdc++-v3/include/std/complex
index 8f9368fd7d0..bdc238e73b0 100644
--- a/libstdc++-v3/include/std/complex
+++ b/libstdc++-v3/include/std/complex
@@ -1098,6 +1098,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       }
 #endif
 
+#if __cplusplus >= 201103L
+      _GLIBCXX14_CONSTEXPR complex(const complex&) = default;
+#endif
+
       explicit _GLIBCXX_CONSTEXPR complex(const complex<double>&);
       explicit _GLIBCXX_CONSTEXPR complex(const complex<long double>&);
 
@@ -1244,6 +1248,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       }
 #endif
 
+#if __cplusplus >= 201103L
+      _GLIBCXX14_CONSTEXPR complex(const complex&) = default;
+#endif
+
       _GLIBCXX_CONSTEXPR complex(const complex<float>& __z)
       : _M_value(__z.__rep()) { }
 
@@ -1391,6 +1399,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       }
 #endif
 
+#if __cplusplus >= 201103L
+      _GLIBCXX14_CONSTEXPR complex(const complex&) = default;
+#endif
+
       _GLIBCXX_CONSTEXPR complex(const complex<float>& __z)
       : _M_value(__z.__rep()) { }