[clang-tools-extra] f0dc266 - [NFC] [clangd] [C++20] [Modules] Improve logging message

[Chuanqi Xu via cfe-commits]

Author: Chuanqi Xu
Date: 2025-08-28T10:55:37+08:00
New Revision: f0dc2660997e9dc1dfb017951a1124c5db2e4c23

URL: https://github.com/llvm/llvm-project/commit/f0dc2660997e9dc1dfb017951a1124c5db2e4c23
DIFF: https://github.com/llvm/llvm-project/commit/f0dc2660997e9dc1dfb017951a1124c5db2e4c23.diff

LOG: [NFC] [clangd] [C++20] [Modules] Improve logging message

Improve logging message to help users to debug the failure reasons.

Added: 
    

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

Removed: 
    


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diff  --git a/clang-tools-extra/clangd/ModulesBuilder.cpp b/clang-tools-extra/clangd/ModulesBuilder.cpp
index 23afc9fce556f..64f22b9fdf743 100644
--- a/clang-tools-extra/clangd/ModulesBuilder.cpp
+++ b/clang-tools-extra/clangd/ModulesBuilder.cpp
@@ -333,7 +333,10 @@ buildModuleFile(llvm::StringRef ModuleName, PathRef ModuleUnitFileName,
 
     return llvm::createStringError(
         llvm::formatv("Failed to compile {0}. Use '--log=verbose' to view "
-                      "detailed failure reasons.",
+                      "detailed failure reasons. It is helpful to use "
+                      "'--debug-modules-builder' flag to keep the clangd's "
+                      "built module files to reproduce the failure for "
+                      "debugging. Remember to remove them after debugging.",
                       ModuleUnitFileName));
   }