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[clang] Implement P3074R7 - trivial unions

c++26

clang:frontendLanguage frontend issues, e.g. anything involving "Sema"Language frontend issues, e.g. anything involving "Sema"

waiting-for-wg21Blocked on C++ Standards CommitteeBlocked on C++ Standards Committee

Status: Open.

#127601 In llvm/llvm-project;

· cor3ntin opened on Feb 18, 2025

Wrong codegen for overload set with aggregate designated initializers and anonymous union

clang:diagnosticsNew/improved warning or error message in Clang, but not in clang-tidy or static analyzerNew/improved warning or error message in Clang, but not in clang-tidy or static analyzer

clang:frontendLanguage frontend issues, e.g. anything involving "Sema"Language frontend issues, e.g. anything involving "Sema"

waiting-for-wg21Blocked on C++ Standards CommitteeBlocked on C++ Standards Committee

Status: Open.

#59868 In llvm/llvm-project;

· ecatmur opened on Jan 7, 2023

Explicit template instantiation of nested types

bugzillaIssues migrated from bugzillaIssues migrated from bugzilla

c++11

clang:frontendLanguage frontend issues, e.g. anything involving "Sema"Language frontend issues, e.g. anything involving "Sema"

diverges-from:edgDoes the clang frontend diverge from edg compilerDoes the clang frontend diverge from edg compiler

diverges-from:gccDoes the clang frontend diverge from gcc on this issueDoes the clang frontend diverge from gcc on this issue

diverges-from:msvcDoes the clang frontend diverge from msvc on this issueDoes the clang frontend diverge from msvc on this issue

waiting-for-wg21Blocked on C++ Standards CommitteeBlocked on C++ Standards Committee

Status: Open.

#48477 In llvm/llvm-project;

· Tomaqa opened on Feb 10, 2021

Consider forbidding non-constant expressions in <code>offsetof</code>

bugzillaIssues migrated from bugzillaIssues migrated from bugzilla

c++

clang:frontendLanguage frontend issues, e.g. anything involving "Sema"Language frontend issues, e.g. anything involving "Sema"

cwg-issueAn issue that was filed to the Core Working GroupAn issue that was filed to the Core Working Group

waiting-for-wg21Blocked on C++ Standards CommitteeBlocked on C++ Standards Committee

Status: Open.

#47751 In llvm/llvm-project;

· trofi opened on Dec 6, 2020

Aggregates containing elements with constexpr constructors are not statically initalized

bugzillaIssues migrated from bugzillaIssues migrated from bugzilla

c++20

clang:to-be-triagedShould not be used for new issuesShould not be used for new issues

waiting-for-wg21Blocked on C++ Standards CommitteeBlocked on C++ Standards Committee

Status: Open.

#44712 In llvm/llvm-project;

· BillyONeal opened on Mar 31, 2020

template type deduction handled improperly with implicit overload resolution

bugzillaIssues migrated from bugzillaIssues migrated from bugzilla

c++

clang:frontendLanguage frontend issues, e.g. anything involving "Sema"Language frontend issues, e.g. anything involving "Sema"

waiting-for-wg21Blocked on C++ Standards CommitteeBlocked on C++ Standards Committee

Status: Open.

#42632 In llvm/llvm-project;

· compnerd opened on Sep 11, 2019

Missed guaranteed copy elision during implicit conversion and constructor delegation.

bugzillaIssues migrated from bugzillaIssues migrated from bugzilla

c++17

clang:frontendLanguage frontend issues, e.g. anything involving "Sema"Language frontend issues, e.g. anything involving "Sema"

waiting-for-wg21Blocked on C++ Standards CommitteeBlocked on C++ Standards Committee

Status: Open.

#34037 In llvm/llvm-project;

· llvmbot opened on Sep 21, 2017

Regression(r274291): Missing diagnostic for return of <code>std::unique_ptr&lt;Derived&gt;</code> in C++11

bugzillaIssues migrated from bugzillaIssues migrated from bugzilla

c++11

clang:diagnosticsNew/improved warning or error message in Clang, but not in clang-tidy or static analyzerNew/improved warning or error message in Clang, but not in clang-tidy or static analyzer

libc++libc++ C++ Standard Library. Not GNU libstdc++. Not libc++abi.libc++ C++ Standard Library. Not GNU libstdc++. Not libc++abi.

waiting-for-wg21Blocked on C++ Standards CommitteeBlocked on C++ Standards Committee

Status: Open.

#30809 In llvm/llvm-project;

· llvmbot opened on Dec 23, 2016

clang accepts friend that g++/Comeau reject

accepts-invalid

bugzillaIssues migrated from bugzillaIssues migrated from bugzilla

c++

clang:frontendLanguage frontend issues, e.g. anything involving "Sema"Language frontend issues, e.g. anything involving "Sema"

confirmedVerified by a second partyVerified by a second party

diverges-from:gccDoes the clang frontend diverge from gcc on this issueDoes the clang frontend diverge from gcc on this issue

waiting-for-wg21Blocked on C++ Standards CommitteeBlocked on C++ Standards Committee

Status: Open.

#12361 In llvm/llvm-project;

· llvmbot opened on Feb 12, 2012