[clang][FileManager] fillRealPathName even if we aren't opening the file

The pathname wasn't previously filled when the getFile() method was called with openFile = false.
We are caching FileEntry-s in ParsedAST::Includes in clangd and this caused the problem.

This fixes an internal test failure in clangd - ClangdTests.GoToInclude.All

rdar://47536127

Differential Revision: https://reviews.llvm.org/D58213

llvm-svn: 354075

1 files changed, 3 insertions, 0 deletions

diff --git a/clang/lib/Basic/FileManager.cpp b/clang/lib/Basic/FileManager.cpp
index 75caff95559..41026763377 100644
--- a/clang/lib/Basic/FileManager.cpp
+++ b/clang/lib/Basic/FileManager.cpp
@@ -267,6 +267,9 @@ const FileEntry *FileManager::getFile(StringRef Filename, bool openFile,
   if (UFE.File) {
     if (auto PathName = UFE.File->getName())
       fillRealPathName(&UFE, *PathName);
+  } else if (!openFile) {
+    // We should still fill the path even if we aren't opening the file.
+    fillRealPathName(&UFE, InterndFileName);
   }
   return &UFE;
 }