[PATCH] D51349: [clangd] Use buffered llvm::errs() in the clangd binary.

[Eric Liu via Phabricator via cfe-commits]

This revision was automatically updated to reflect the committed changes.
ioeric marked an inline comment as done.
Closed by commit rCTE340822: [clangd] Use buffered llvm::errs() in the clangd binary. (authored by ioeric, committed by ).

Changed prior to commit:
  https://reviews.llvm.org/D51349?vs=162832&id=162839#toc

Repository:
  rCTE Clang Tools Extra

https://reviews.llvm.org/D51349

Files:
  clangd/tool/ClangdMain.cpp


Index: clangd/tool/ClangdMain.cpp
===================================================================
--- clangd/tool/ClangdMain.cpp
+++ clangd/tool/ClangdMain.cpp
@@ -259,6 +259,9 @@
   if (Tracer)
     TracingSession.emplace(*Tracer);
 
+  // Use buffered stream to stderr (we still flush each log message). Unbuffered
+  // stream can cause significant (non-deterministic) latency for the logger.
+  llvm::errs().SetBuffered();
   JSONOutput Out(llvm::outs(), llvm::errs(), LogLevel,
                  InputMirrorStream ? InputMirrorStream.getPointer() : nullptr,
                  PrettyPrint);


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