From 3fd25c90fab85fc6aa9949311b13992c63ba7345 Mon Sep 17 00:00:00 2001
From: audiofanatic <audiofanatic@gmail.com>
Date: Mon, 15 Jun 2009 20:23:49 +0200
Subject: Force line buffering for stdout so it stays in sync better with
stderr (which is unbuffered)
Task-number: 254786
Merge-request: 610
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>
---
qmake/main.cpp | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/qmake/main.cpp b/qmake/main.cpp
index fe274c4..7da66ac 100644
--- a/qmake/main.cpp
+++ b/qmake/main.cpp
@@ -84,6 +84,13 @@ bool qmake_setpwd(const QString &p)
int runQMake(int argc, char **argv)
{
+ // stderr is unbuffered by default, but stdout buffering depends on whether
+ // there is a terminal attached. Buffering can make output from stderr and stdout
+ // appear out of sync, so force stdout to be line buffered to minimize this without
+ // hurting performance too much (if at all). This is particularly important for
+ // things like QtCreator and scripted builds.
+ setvbuf(stdout, (char *)NULL, _IOLBF, 0);
+
// parse command line
int ret = Option::init(argc, argv);
if(ret != Option::QMAKE_CMDLINE_SUCCESS) {
--
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