Index: llvm/tools/sanstats/sanstats.cpp
===================================================================
--- llvm/tools/sanstats/sanstats.cpp
+++ llvm/tools/sanstats/sanstats.cpp
@@ -15,7 +15,9 @@
 #include "llvm/DebugInfo/Symbolize/Symbolize.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/ErrorOr.h"
+#include "llvm/Support/FileSystem.h"
 #include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/Path.h"
 #include "llvm/Transforms/Utils/SanitizerStats.h"
 #include <stdint.h>
 
@@ -52,7 +54,11 @@
     ++Begin;
   if (Begin == End)
     return nullptr;
-  StringRef Filename(FilenameBegin, Begin - FilenameBegin);
+  std::string Filename(FilenameBegin, Begin - FilenameBegin);
+
+  if (!llvm::sys::fs::exists(Filename))
+    Filename = std::string(llvm::sys::path::parent_path(ClInputFile)) +
+               std::string(llvm::sys::path::filename(Filename));
 
   ++Begin;
   if (Begin == End)