[clang-tools-extra] bd74186 - [clangd] Avoid passing -xobjective-c++-header to the system include extractor

[Nathan Ridge via cfe-commits]

Author: Nathan Ridge
Date: 2023-08-18T00:40:11-04:00
New Revision: bd74186f1a0831b2c596e87ea056419379a223c1

URL: https://github.com/llvm/llvm-project/commit/bd74186f1a0831b2c596e87ea056419379a223c1
DIFF: https://github.com/llvm/llvm-project/commit/bd74186f1a0831b2c596e87ea056419379a223c1.diff

LOG: [clangd] Avoid passing -xobjective-c++-header to the system include extractor

Fixes https://github.com/clangd/clangd/issues/1568

Differential Revision: https://reviews.llvm.org/D147905

Added: 
    

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

Removed: 
    


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diff  --git a/clang-tools-extra/clangd/SystemIncludeExtractor.cpp b/clang-tools-extra/clangd/SystemIncludeExtractor.cpp
index 6cce28f53b5771..ac99b220f6bd3f 100644
--- a/clang-tools-extra/clangd/SystemIncludeExtractor.cpp
+++ b/clang-tools-extra/clangd/SystemIncludeExtractor.cpp
@@ -133,6 +133,16 @@ struct DriverArgs {
       }
     }
 
+    // Downgrade objective-c++-header (used in clangd's fallback flags for .h
+    // files) to c++-header, as some drivers may fail to run the extraction
+    // command if it contains `-xobjective-c++-header` and objective-c++ support
+    // is not installed.
+    // In practice, we don't see 
diff erent include paths for the two on
+    // clang+mac, which is the most common objectve-c compiler.
+    if (Lang == "objective-c++-header") {
+      Lang = "c++-header";
+    }
+
     // If language is not explicit in the flags, infer from the file.
     // This is important as we want to cache each language separately.
     if (Lang.empty()) {