[clang-tools-extra] e442c67 - [clangd] Fix C++20 build failure

[Haojian Wu via cfe-commits]

Author: Haojian Wu
Date: 2025-11-24T17:22:04+01:00
New Revision: e442c67a2c98a3e1e3bfcf90aaa82ba70fb92760

URL: https://github.com/llvm/llvm-project/commit/e442c67a2c98a3e1e3bfcf90aaa82ba70fb92760
DIFF: https://github.com/llvm/llvm-project/commit/e442c67a2c98a3e1e3bfcf90aaa82ba70fb92760.diff

LOG: [clangd] Fix C++20 build failure

Added: 
    

Modified: 
    clang-tools-extra/clangd/SemanticSelection.cpp

Removed: 
    


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diff  --git a/clang-tools-extra/clangd/SemanticSelection.cpp b/clang-tools-extra/clangd/SemanticSelection.cpp
index c2dad53bcec6b..dc61a40d733f8 100644
--- a/clang-tools-extra/clangd/SemanticSelection.cpp
+++ b/clang-tools-extra/clangd/SemanticSelection.cpp
@@ -222,6 +222,9 @@ class PragmaRegionFinder {
   }
 
   void operator()(const DirectiveTree::Conditional &C) {
+    // C.Branches needs to see the DirectiveTree definition, otherwise build
+    // fails in C++20.
+    [[maybe_unused]] DirectiveTree Dummy;
     for (const auto &[_, SubTree] : C.Branches)
       walk(SubTree);
   }