Patrick Palka d92712cdcb libstdc++: Restrict engaged -> disengaged std::optional fix [PR124910] ...

It turns out a union without an active member does not violate C++20 core
constant expression rules and r16-8748 was really just a workaround for a
front end bug.  The actual underlying problem -- that the constexpr
evaluator treated an explicitly destroyed union member as still active --
has been fixed by r16-8767 which makes this workaround unnecessary for GCC.
Rather than remove the workaround, restrict it to Clang which seems to have
a similar bug making it still needed for e.g. the r16-8748 testcase.

	PR c++/124910

libstdc++-v3/ChangeLog:

	* include/std/optional (_Optional_payload_base::_M_destroy):
	Restrict r16-8748 workaround to Clang, and adjust comment.

Reviewed-by: Jonathan Wakely <jwakely@redhat.com>

2026-04-21 09:33:50 -04:00

..

.editorconfig

libstdc++: Add .editorconfig files

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algorithm

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any

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array

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atomic

libstdc++: Adjust indentation of std::atomic<T*> wait/notify members

2026-03-03 16:11:58 +00:00

barrier

libstdc++: Fix memory leak in std::barrier destructor [PR123378]

2026-01-07 15:20:45 +00:00

bit

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bitset

libstdc++: bitset _GLIBCXX_ASSERTIONS op[] fixes

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charconv

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chrono

libstdc++: Improve Doxygen comments in <chrono>

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codecvt

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complex

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concepts

libstdc++: Use overload operator<=> when provided in relational functors [PR114153]

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contracts

libstdc++: Define __cpp_lib_replaceable_contract_violation_handler.

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coroutine

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debugging

libstdc++: Implement C++26 <debugging> features [PR119670]

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deque

libstdc++: Fix std::erase_if behavior for std::__debug containers

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execution

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expected

libstdc++: Make std::expected nodiscard [PR119197]

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filesystem

libstdc++: implement formatter for std::filesystem::path

2026-02-16 12:34:18 +01:00

flat_map

libstdc++: constexpr flat_map and flat_multimap

2026-01-10 15:08:53 +08:00

flat_set

libstdc++: Implement C++26 P3378R2 - constexpr exception types

2025-12-11 19:54:44 +01:00

format

libstdc++: Export explicit instantiations of __format::__do_vformat_to.

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forward_list

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functional

libstdc++: Fix errors in Doxygen markup

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future

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generator

libstdc++: Micro-optimization for std::generator helper concept

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inplace_vector

libstdc++: Updated inplace_vector::try_ functions per P3981R2 and P4022R0.

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limits

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list

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locale

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map

libstdc++: container heterogeneous insertion (P2363) [PR117402]

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mdspan

libstdc++: Rename std::strided_slice to std::extent_slice.

2026-04-02 09:58:44 +02:00

memory

libstdc++: Add allocate_at_least (P0401) [PR118030]

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meta

c++, libstdc++: Implement LWG4483 - Multidimensional arrays are not supported by meta::reflect_constant_array and related functions

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numbers

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numeric

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optional

libstdc++: Restrict engaged -> disengaged std::optional fix [PR124910]

2026-04-21 09:33:50 -04:00

ostream

libstdc++: Optionally define std::print functions non-inline [PR124410]

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print

libstdc++: Optionally define std::print functions non-inline [PR124410]

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queue

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random

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set

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simd

libstdc++: Implement [simd] for C++26

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source_location

libstdc++: Fix ambiguity caused by new std::source_location constructor

2026-02-05 16:48:20 +00:00

span

libstdc++: Remove span constructor from initializer_list.

2026-04-10 08:02:37 +02:00

spanstream

libstdc++: Fix some -Wsign-compare warnings in headers

2025-09-27 21:18:42 +01:00

sstream

libstdc++: Fix std::basic_stringbuf::str()&& [PR123100]

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stack

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stacktrace

libstdc++: Improve ostream output for std::stacktrace

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streambuf

libstdc++: Add #pragma to slience null-dereference warning in istreambuf_iterator::operator++ [PR105580]

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string

libstdc++: Fix std::erase_if behavior for std::__debug containers

2026-01-19 06:36:11 +01:00

string_view

libstdc++: Change comment on #endif to match #if condition [PR124363]

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thread

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tuple

libstdc++: Make CTAD ignore tuple(const Types&...) constructor [PR121771]

2026-02-13 09:06:31 +00:00

type_traits

libstdc++: Move constant_wrapper from <type_traits> to <utility>

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typeindex

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unordered_map

libstdc++: container heterogeneous insertion (P2363) [PR117402]

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unordered_set

libstdc++: container heterogeneous insertion (P2363) [PR117402]

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utility

libstdc++: Move constant_wrapper from <type_traits> to <utility>

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version

libstdc++: Add Doxygen documentation to <version>

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