From f02bb058bddd6240f1bda49a11f5224af92e466c Mon Sep 17 00:00:00 2001
From: Jeremy White <jwhite@codeweavers.com>
Date: Fri, 27 Oct 2017 02:46:56 -0500
Subject: [PATCH] Set the llvm standard output stream to be unbuffered. (#678)

This is particularly useful for the simulation when invokved
inside Eclipse.  Otherwise, you won't see the robot starting
message.
---
 hal/src/main/native/athena/HAL.cpp | 1 +
 hal/src/main/native/sim/HAL.cpp    | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/hal/src/main/native/athena/HAL.cpp b/hal/src/main/native/athena/HAL.cpp
index ac84792f81..798c99639b 100644
--- a/hal/src/main/native/athena/HAL.cpp
+++ b/hal/src/main/native/athena/HAL.cpp
@@ -342,6 +342,7 @@ HAL_Bool HAL_Initialize(int32_t timeout, int32_t mode) {
 
   setlinebuf(stdin);
   setlinebuf(stdout);
+  llvm::outs().SetUnbuffered();
 
   prctl(PR_SET_PDEATHSIG, SIGTERM);
 
diff --git a/hal/src/main/native/sim/HAL.cpp b/hal/src/main/native/sim/HAL.cpp
index a9f08a1d83..b69455a4ef 100644
--- a/hal/src/main/native/sim/HAL.cpp
+++ b/hal/src/main/native/sim/HAL.cpp
@@ -7,6 +7,8 @@
 
 #include "HAL/HAL.h"
 
+#include <llvm/raw_ostream.h>
+
 #include "ErrorsInternal.h"
 #include "HAL/DriverStation.h"
 #include "HAL/Errors.h"
@@ -204,6 +206,7 @@ HAL_Bool HAL_Initialize(int32_t timeout, int32_t mode) {
   // Second check in case another thread was waiting
   if (initialized) return true;
 
+  llvm::outs().SetUnbuffered();
   if (HAL_LoadExtensions() < 0) return false;
   hal::RestartTiming();
   HAL_InitializeDriverStation();