Fix PR5633 by making the preprocessor handle the case where we can

stat a file but where mmaping it fails.  In this case, we emit an
error like:
t.c:1:10: fatal error: error opening file '../../foo.h'

instead of "cannot find file".



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@90110 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/Frontend/FrontendActions.cpp b/lib/Frontend/FrontendActions.cpp
index 6cb3928d51..8092b715e3 100644
--- a/lib/Frontend/FrontendActions.cpp
+++ b/lib/Frontend/FrontendActions.cpp
@@ -192,7 +192,8 @@ void DumpRawTokensAction::ExecuteAction() {
   SourceManager &SM = PP.getSourceManager();
 
   // Start lexing the specified input file.
-  Lexer RawLex(SM.getMainFileID(), SM, PP.getLangOptions());
+  const llvm::MemoryBuffer *FromFile = SM.getBuffer(SM.getMainFileID());
+  Lexer RawLex(SM.getMainFileID(), FromFile, SM, PP.getLangOptions());
   RawLex.SetKeepWhitespaceMode(true);
 
   Token RawTok;