qtbase: improve internal build system to support OE way of building qt

* add linux-oe-g++ mkspec directly with patch
* add functions to read and eval OE_QMAKE functions from mkspec and
  also export them with QMakeVar to be available also for config.tests
* add external-host-bindir parameter to skip building native tools
  even when we're in fact cross-compiling (because we have them from
  qtbase-native build already).
* use separated ${B} and ${S} and clean ${B} when reconfiguring
  stalled qmake cache can be used when configure is reexecuted
  cleaning ${B} prevents that and provide cleaner separation
* OE_QMAKE_AR cqs is added by Makefile, having it here too was causing
  issues
* isEmpty(QT_EXTERNAL_HOST_BINS) doesn't work, so lets use exist()
  even when it allows to incorrectly set wrong directory and build
  native tools again (instead of skipping them)

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/recipes-qt/qt5/qtbase/0004-qmake-is-already-built-in-qtbase-native.patch b/recipes-qt/qt5/qtbase/0004-qmake-is-already-built-in-qtbase-native.patch
new file mode 100644
index 00000000..91709741
--- /dev/null
+++ b/recipes-qt/qt5/qtbase/0004-qmake-is-already-built-in-qtbase-native.patch
@@ -0,0 +1,30 @@
+From 956195c897287787b545e570ee976d1d2917eca8 Mon Sep 17 00:00:00 2001
+From: Michael Krelin <hacker@klever.net>
+Date: Mon, 29 Oct 2012 20:07:49 -0700
+Subject: [PATCH 4/6] qmake is already built in qtbase-native
+
+Ported from OE by: Yu Ke <ke.yu@intel.com>
+Upstream-Status: Inappropriate [configuration]
+
+Signed-off-by: Mikko Levonmaa <mikko.levonmaa@gmail.com>
+Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
+---
+ configure | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/configure b/configure
+index 50f1ef2..8710c28 100755
+--- a/configure
++++ b/configure
+@@ -3641,7 +3641,7 @@ setBootstrapEvalVariable()
+ 
+ 
+ # build qmake
+-if true; then ###[ '!' -f "$outpath/bin/qmake" ];
++if false; then ###[ '!' -f "$outpath/bin/qmake" ];
+     echo "Creating qmake. Please wait..."
+ 
+     mkdir -p "$outpath/qmake" || exit
+-- 
+1.8.2.1
+