ThinLTOCodeGenerator: handle cases where temporary files can't be renamed

For instance when they're on different filesystem.

From: Mehdi Amini <mehdi.amini@apple.com>
llvm-svn: 269544

1 files changed, 6 insertions, 2 deletions

diff --git a/llvm/lib/LTO/ThinLTOCodeGenerator.cpp b/llvm/lib/LTO/ThinLTOCodeGenerator.cpp
index b57166d..33d0a0c 100644
--- a/llvm/lib/LTO/ThinLTOCodeGenerator.cpp
+++ b/llvm/lib/LTO/ThinLTOCodeGenerator.cpp
@@ -504,8 +504,12 @@ public:
     // Rename to final destination (hopefully race condition won't matter here)
     EC = sys::fs::rename(TempFilename, EntryPath);
     if (EC) {
-      errs() << "Error: " << EC.message() << "\n";
-      report_fatal_error("ThinLTO: Can't rename temporary file " + TempFilename + " to " + EntryPath);
+      sys::fs::remove(TempFilename);
+      raw_fd_ostream OS(EntryPath, EC, sys::fs::F_None);
+      if (EC)
+        report_fatal_error(Twine("Failed to open ") + EntryPath +
+                           " to save cached entry\n");
+      OS << OutputBuffer.getBuffer();
     }
   }
 };