Fix a file overwrite bug in llvm-ar introduced by changes to

createTemporaryFile semantics where it doesn't create a fully unique name
if the basename doesn't exist. This functionality is now optionally
provided by the boolean reuse_current parameter to createTemporaryFile and
makeUnique. The default values differ because of the way these functions
are used in LLVM.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18961 91177308-0d34-0410-b5e6-96231b3b80d8

lib/System/Win32/Path.cpp

@@ -587,8 +587,8 @@ CopyFile(const sys::Path &Dest, const sys::Path &Src) {
 }
 
 void 
-Path::makeUnique() {
-  if (!exists())
+Path::makeUnique( bool reuse_current ) {
+  if (reuse_current && !exists())
     return; // File doesn't exist already, just use it!
 
   Path dir (*this);
@@ -602,6 +602,16 @@ Path::makeUnique() {
   path = newName;
 }
 
+bool
+Path::createTemporaryFile(bool reuse_current) {
+  // Make sure we're dealing with a file
+  if (!isFile()) 
+    return false;
+
+  // Make this into a unique file name
+  makeUnique( reuse_current );
+}
+
 }
 }