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Clang accepts invalid program involving multiple inherited type members

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

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

Status: Open.

#174089 In llvm/llvm-project;

· ranaanoop opened on Dec 31, 2025

[Clang]Clang rejects <code>friend auto</code> function inside class template when a same-named global function exists (accepted by GCC/MSVC/EDG)

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

diverges-from:edgDoes the clang frontend diverge from edg compiler on this issueDoes the clang frontend diverge from edg compiler on this issue

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

Status: Open.

#163514 In llvm/llvm-project;

· Attacker23 opened on Oct 15, 2025

[clang] Implement CWG1693 to allow empty declarations in classes.

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

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

Status: Open.

#155538 In llvm/llvm-project;

· keinflue opened on Aug 27, 2025

clang accepts partial template specialization without base

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

diverges-from:edgDoes the clang frontend diverge from edg compiler on this issueDoes the clang frontend diverge from edg compiler on this issue

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

Status: Open.

#131835 In llvm/llvm-project;

· abellgithub opened on Mar 18, 2025

Various issues with using uncaptured constexpr variable in lambda

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

constexprAnything related to constant evaluationAnything related to constant evaluation

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

lambdaC++11 lambda expressionsC++11 lambda expressions

Status: Open.

#127086 In llvm/llvm-project;

· davidstone opened on Feb 13, 2025

std::variant of inner class cannot be created if inner class has initializers

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

conceptsC++20 conceptsC++20 concepts

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

libstdc++GNU libstdc++ C++ standard libraryGNU libstdc++ C++ standard library

Status: Open.

#124088 In llvm/llvm-project;

· tbleher opened on Jan 23, 2025

constexpr dynamic_cast failure

c++20

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

constexprAnything related to constant evaluationAnything related to constant evaluation

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

rejects-valid

Status: Open.

#68199 In llvm/llvm-project;

· gbMattN opened on Oct 4, 2023

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

Implement CWG 1496

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"

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

Status: Open.

#41260 In llvm/llvm-project;

· CaseyCarter opened on May 16, 2019

is_trivially_copyable_v misbehaves

ABIApplication Binary InterfaceApplication Binary Interface

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

Status: Open.

#38398 In llvm/llvm-project;

· llvmbot opened on Sep 22, 2018

Implement CWG 1780

accepts-invalid

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"

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

lambdaC++11 lambda expressionsC++11 lambda expressions

Status: Open.

#26540 In llvm/llvm-project;

· llvmbot opened on Jan 16, 2016

rejects-valid if parenthesized temporary is followed by array indexing

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"

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

objective-c++

rejects-valid

Status: Open.

#20723 In llvm/llvm-project;

· zygoloid opened on Jul 18, 2014