[clang-tools-extra] [clang-tidy][use-internal-linkage] fix false positive for consteval function (PR #122141)

[via cfe-commits]

https://github.com/maflcko created https://github.com/llvm/llvm-project/pull/122141

Fixes https://github.com/llvm/llvm-project/issues/122096

>From 92e175391c150d53f887e24125a7f80c26fc630e Mon Sep 17 00:00:00 2001
From: MarcoFalke <*~=`'#}+{/-|&$^_ at 721217.xyz>
Date: Wed, 8 Jan 2025 17:46:47 +0100
Subject: [PATCH] [clang-tidy][use-internal-linkage] fix false positive for
 consteval function

---
 .../clang-tidy/misc/UseInternalLinkageCheck.cpp             | 2 +-
 clang-tools-extra/docs/ReleaseNotes.rst                     | 6 +++---
 .../checkers/misc/use-internal-linkage-consteval.cpp        | 3 +++
 3 files changed, 7 insertions(+), 4 deletions(-)
 create mode 100644 clang-tools-extra/test/clang-tidy/checkers/misc/use-internal-linkage-consteval.cpp

diff --git a/clang-tools-extra/clang-tidy/misc/UseInternalLinkageCheck.cpp b/clang-tools-extra/clang-tidy/misc/UseInternalLinkageCheck.cpp
index 1e0f398a4a560b..4778182944abda 100644
--- a/clang-tools-extra/clang-tidy/misc/UseInternalLinkageCheck.cpp
+++ b/clang-tools-extra/clang-tidy/misc/UseInternalLinkageCheck.cpp
@@ -125,7 +125,7 @@ void UseInternalLinkageCheck::registerMatchers(MatchFinder *Finder) {
                     exportDecl()))))));
   Finder->addMatcher(
       functionDecl(Common, hasBody(),
-                   unless(anyOf(cxxMethodDecl(),
+                   unless(anyOf(cxxMethodDecl(), isConsteval(),
                                 isAllocationOrDeallocationOverloadedFunction(),
                                 isMain())))
           .bind("fn"),
diff --git a/clang-tools-extra/docs/ReleaseNotes.rst b/clang-tools-extra/docs/ReleaseNotes.rst
index 94e15639c4a92e..8bea7e89d94173 100644
--- a/clang-tools-extra/docs/ReleaseNotes.rst
+++ b/clang-tools-extra/docs/ReleaseNotes.rst
@@ -286,9 +286,9 @@ Changes in existing checks
 
 - Improved :doc:`misc-use-internal-linkage
   <clang-tidy/checks/misc/use-internal-linkage>` check to insert ``static``
-  keyword before type qualifiers such as ``const`` and ``volatile`` and fix
-  false positives for function declaration without body and fix false positives
-  for C++20 export declarations and fix false positives for global scoped
+  keyword before type qualifiers such as ``const`` and ``volatile``. Also, fix
+  false positives for function declaration without body, C++20 consteval
+  functions, C++20 export declarations, and global scoped
   overloaded ``operator new`` and ``operator delete``.
 
 - Improved :doc:`modernize-avoid-c-arrays
diff --git a/clang-tools-extra/test/clang-tidy/checkers/misc/use-internal-linkage-consteval.cpp b/clang-tools-extra/test/clang-tidy/checkers/misc/use-internal-linkage-consteval.cpp
new file mode 100644
index 00000000000000..25674a2be4c918
--- /dev/null
+++ b/clang-tools-extra/test/clang-tidy/checkers/misc/use-internal-linkage-consteval.cpp
@@ -0,0 +1,3 @@
+// RUN: %check_clang_tidy -std=c++20 %s misc-use-internal-linkage %t -- -- -I%S/Inputs/use-internal-linkage
+
+consteval void gh122096() {}