Fix PR3464 by searching for headers from the predefines

buffer as if the #include happened from the main file.

llvm-svn: 63764

1 files changed, 13 insertions, 2 deletions

diff --git a/clang/lib/Lex/PPDirectives.cpp b/clang/lib/Lex/PPDirectives.cpp
index 00cb62384e3..c38310b925f 100644
--- a/clang/lib/Lex/PPDirectives.cpp
+++ b/clang/lib/Lex/PPDirectives.cpp
@@ -399,13 +399,24 @@ const FileEntry *Preprocessor::LookupFile(const char *FilenameStart,
   if (!FromDir) {
     FileID FID = getCurrentFileLexer()->getFileID();
     CurFileEnt = SourceMgr.getFileEntryForID(FID);
+    
+    // If there is no file entry associated with this file, it must be the
+    // predefines buffer.  Any other file is not lexed with a normal lexer, so
+    // it won't be scanned for preprocessor directives.   If we have the
+    // predefines buffer, resolve #include references (which come from the
+    // -include command line argument) as if they came from the main file, this
+    // affects file lookup etc.
+    if (CurFileEnt == 0) {
+      FID = SourceMgr.getMainFileID();
+      CurFileEnt = SourceMgr.getFileEntryForID(FID);
+    }
   }
   
   // Do a standard file entry lookup.
   CurDir = CurDirLookup;
   const FileEntry *FE =
-  HeaderInfo.LookupFile(FilenameStart, FilenameEnd,
-                        isAngled, FromDir, CurDir, CurFileEnt);
+    HeaderInfo.LookupFile(FilenameStart, FilenameEnd,
+                          isAngled, FromDir, CurDir, CurFileEnt);
   if (FE) return FE;
   
   // Otherwise, see if this is a subframework header.  If so, this is relative