[PATCH] D147905: [clangd] Avoid passing -xobjective-c++-header to the system include extractor

[Nathan Ridge via Phabricator via cfe-commits]

nridge created this revision.
nridge added a reviewer: kadircet.
Herald added a subscriber: arphaman.
Herald added a project: All.
nridge requested review of this revision.
Herald added subscribers: cfe-commits, MaskRay, ilya-biryukov.
Herald added a project: clang-tools-extra.

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


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D147905

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


Index: clang-tools-extra/clangd/SystemIncludeExtractor.cpp
===================================================================
--- clang-tools-extra/clangd/SystemIncludeExtractor.cpp
+++ clang-tools-extra/clangd/SystemIncludeExtractor.cpp
@@ -333,6 +333,13 @@
       else if (Arg.startswith("-x"))
         Lang = Arg.drop_front(2).trim();
     }
+    // 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.
+    if (Lang == "objective-c++-header") {
+      Lang = "c++-header";
+    }
     if (Lang.empty()) {
       llvm::StringRef Ext = llvm::sys::path::extension(File).trim('.');
       auto Type = driver::types::lookupTypeForExtension(Ext);


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