[Support] Allow discarding a FileOutputBuffer without removing the memory mapping

Differential Revision: https://reviews.llvm.org/D51095

llvm-svn: 340634

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/Support/FileOutputBuffer.cpp b/llvm/lib/Support/FileOutputBuffer.cpp
index 1214b5a0ba1..b8223126227 100644
--- a/llvm/lib/Support/FileOutputBuffer.cpp
+++ b/llvm/lib/Support/FileOutputBuffer.cpp
@@ -61,6 +61,12 @@ public:
     consumeError(Temp.discard());
   }
 
+  void discard() override {
+    // Delete the temp file if it still was open, but keeping the mapping
+    // active.
+    consumeError(Temp.discard());
+  }
+
 private:
   std::unique_ptr<fs::mapped_file_region> Buffer;
   fs::TempFile Temp;