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[clangd] Disable new errs()-tie behavior, it's racy.

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Reviewers: hokein

Subscribers: ilya-biryukov, MaskRay, jkorous, arphaman, kadircet, usaxena95, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D81538
This commit is contained in:
Sam McCall 2020-06-10 09:36:58 +02:00
parent 904f91db5f
commit 4e3a44d42e
1 changed files with 2 additions and 0 deletions
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clang-tools-extra/clangd/tool/ClangdMain.cpp
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@ -585,6 +585,8 @@ clangd accepts flags on the commandline, and in the CLANGD_FLAGS environment var
// 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();
// Don't flush stdout when logging, this would be both slow and racy!
llvm::errs().tie(nullptr);
StreamLogger Logger(llvm::errs(), LogLevel);
LoggingSession LoggingSession(Logger);
// Write some initial logs before we start doing any real work.