From dd388ba3e0b0a5f06565d0bcb6e1aebb5daac065 Mon Sep 17 00:00:00 2001
From: Zequan Wu <zequanwu@google.com>
Date: Wed, 24 Mar 2021 17:54:26 -0700
Subject: [PATCH] [llvm-cov] Check path emptyness in path-equivalence after
 removing dots.

---
 llvm/tools/llvm-cov/CodeCoverage.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/llvm/tools/llvm-cov/CodeCoverage.cpp b/llvm/tools/llvm-cov/CodeCoverage.cpp
index 712766ec9929..144f338b10ed 100644
--- a/llvm/tools/llvm-cov/CodeCoverage.cpp
+++ b/llvm/tools/llvm-cov/CodeCoverage.cpp
@@ -475,7 +475,7 @@ void CodeCoverageTool::remapPathNames(const CoverageMapping &Coverage) {
     SmallString<128> NativePath;
     sys::path::native(Path, NativePath);
     sys::path::remove_dots(NativePath, true);
-    if (!sys::path::is_separator(NativePath.back()))
+    if (!NativePath.empty() && !sys::path::is_separator(NativePath.back()))
       NativePath += sys::path::get_separator();
     return NativePath.c_str();
   };