fix PR7953 - Windows filename are case insensitive:

#pragma once wasn't working on win32 if the header file was included
using a different case.
I tracked down  the problem to the fact that clang::FileManager was
caching files using case sensitive string (UniqueFiles) on Windows.

I changed FileManager to cache filename in lower case only.
Doesn't affect UNIX because UNIX uses Inode to uniquely identify files.

unix doesn't use this codepath.

Analysis and patch by Francois Pichet!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@111866 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Basic/FileManager.cpp b/lib/Basic/FileManager.cpp
index aa175cb1a6c3141921ac70eb4263d03948e7156a..565f8a61dee67310c3645987cff060b883757fe1 100644 (file)
--- a/lib/Basic/FileManager.cpp
+++ b/lib/Basic/FileManager.cpp
@@ -19,6 +19,7 @@
 
 #include "clang/Basic/FileManager.h"
 #include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringExtras.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/System/Path.h"
 #include "llvm/Config/config.h"
@@ -83,6 +84,9 @@ class FileManager::UniqueFileContainer {
 public:
   FileEntry &getFile(const char *Name, struct stat &StatBuf) {
     std::string FullPath(GetFullPath(Name));
+    
+    // LowercaseString because Windows filesystem is case insensitive.
+    FullPath = llvm::LowercaseString(FullPath);
     return UniqueFiles.GetOrCreateValue(
                                FullPath.c_str(),
                                FullPath.c_str() + FullPath.size()