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
diff --git a/lib/Frontend/RewriteMacros.cpp b/lib/Frontend/RewriteMacros.cpp
index b5d59c0..0bcbd4f 100644
--- a/lib/Frontend/RewriteMacros.cpp
+++ b/lib/Frontend/RewriteMacros.cpp
@@ -65,7 +65,8 @@
// Create a lexer to lex all the tokens of the main file in raw mode. Even
// though it is in raw mode, it will not return comments.
- Lexer RawLex(SM.getMainFileID(), SM, PP.getLangOptions());
+ const llvm::MemoryBuffer *FromFile = SM.getBuffer(SM.getMainFileID());
+ Lexer RawLex(SM.getMainFileID(), FromFile, SM, PP.getLangOptions());
// Switch on comment lexing because we really do want them.
RawLex.SetCommentRetentionState(true);