[llvm-dwp] Get the DWO file from relative path if the absolute path is not valid

Extend the llvm-dwp to support searching the DWOs that from relative path for the
case that build from remote building system(different comp_dir).

Reviewd By: dblaikie

Differential Revision: https://reviews.llvm.org/D133480

1 files changed, 4 insertions, 1 deletions

diff --git a/llvm/tools/llvm-dwp/llvm-dwp.cpp b/llvm/tools/llvm-dwp/llvm-dwp.cpp
index 7d1dd61..f9d1dc4 100644
--- a/llvm/tools/llvm-dwp/llvm-dwp.cpp
+++ b/llvm/tools/llvm-dwp/llvm-dwp.cpp
@@ -71,7 +71,10 @@ getDWOFilenames(StringRef ExecFilename) {
     if (!DWOCompDir.empty()) {
       SmallString<16> DWOPath(std::move(DWOName));
       sys::fs::make_absolute(DWOCompDir, DWOPath);
-      DWOPaths.emplace_back(DWOPath.data(), DWOPath.size());
+      if (!sys::fs::exists(DWOPath) && sys::fs::exists(DWOName))
+        DWOPaths.push_back(std::move(DWOName));
+      else
+        DWOPaths.emplace_back(DWOPath.data(), DWOPath.size());
     } else {
       DWOPaths.push_back(std::move(DWOName));
     }