[clang-tools-extra] aa1ac2a - [clangd] Flush stderr after signal handlers run, so we always get the full stack/crash info

[Sam McCall via cfe-commits]

Author: Sam McCall
Date: 2021-10-26T01:08:36+02:00
New Revision: aa1ac2ae451e54dfa19dce2794800bbd034e2194

URL: https://github.com/llvm/llvm-project/commit/aa1ac2ae451e54dfa19dce2794800bbd034e2194
DIFF: https://github.com/llvm/llvm-project/commit/aa1ac2ae451e54dfa19dce2794800bbd034e2194.diff

LOG: [clangd] Flush stderr after signal handlers run, so we always get the full stack/crash info

Added: 
    

Modified: 
    clang-tools-extra/clangd/tool/ClangdMain.cpp

Removed: 
    


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diff  --git a/clang-tools-extra/clangd/tool/ClangdMain.cpp b/clang-tools-extra/clangd/tool/ClangdMain.cpp
index 2e48bfb433f0c..4f8895b5d605c 100644
--- a/clang-tools-extra/clangd/tool/ClangdMain.cpp
+++ b/clang-tools-extra/clangd/tool/ClangdMain.cpp
@@ -681,7 +681,12 @@ int main(int argc, char *argv[]) {
   llvm::InitializeAllTargetInfos();
   llvm::sys::PrintStackTraceOnErrorSignal(argv[0]);
   llvm::sys::AddSignalHandler(
-      [](void *) { ThreadCrashReporter::runCrashHandlers(); }, nullptr);
+      [](void *) {
+        ThreadCrashReporter::runCrashHandlers();
+        // Ensure ThreadCrashReporter and PrintStackTrace output is visible.
+        llvm::errs().flush();
+      },
+      nullptr);
   llvm::sys::SetInterruptFunction(&requestShutdown);
   llvm::cl::SetVersionPrinter([](llvm::raw_ostream &OS) {
     OS << versionString() << "\n"