Android: Enable the java feature on Windows.

There is a bug in dx.bat in the Google Android SDK tool where
relative paths do not work correctly. We need to use our own
version of this tool until:
https://android-review.googlesource.com/#/c/52680/
..is merged.

Change-Id: I451a3239590919d014a673f3e8e17244e96676ab
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>

mkspecs/features/data/android/dx.bat

@@ -0,0 +1,102 @@
+@echo off
+REM Copyright (C) 2007 The Android Open Source Project
+REM
+REM Licensed under the Apache License, Version 2.0 (the "License");
+REM you may not use this file except in compliance with the License.
+REM You may obtain a copy of the License at
+REM
+REM     http://www.apache.org/licenses/LICENSE-2.0
+REM
+REM Unless required by applicable law or agreed to in writing, software
+REM distributed under the License is distributed on an "AS IS" BASIS,
+REM WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+REM See the License for the specific language governing permissions and
+REM limitations under the License.
+
+REM If/when Google merge:
+REM https://android-review.googlesource.com/#/c/52680/
+REM this file will become redundant.
+
+REM don't modify the caller's environment
+setlocal
+
+REM Locate dx.jar in the directory where dx.bat was found and start it.
+
+REM Set up prog to be the path of this script, including following symlinks,
+REM and set up progdir to be the fully-qualified pathname of its directory.
+set prog=%~f0
+
+if [%1]==[] goto badArgs
+set "androidsdk=%1"
+shift /1
+
+if [%1]==[] goto badArgs
+
+rem Check we have a valid Java.exe in the path.
+set java_exe=
+call "%androidsdk%\tools\lib\find_java.bat"
+if not defined java_exe goto :EOF
+
+set jarfile=dx.jar
+set "frameworkdir=%androidsdk%\platform-tools"
+
+if exist "%frameworkdir%\%jarfile%" goto JarFileOk
+    set "frameworkdir=%androidsdk%\lib"
+
+if exist "%frameworkdir%\%jarfile%" goto JarFileOk
+    set "frameworkdir=%androidsdk%\framework"
+
+:JarFileOk
+
+set jarpath=%frameworkdir%\%jarfile%
+
+set javaOpts=
+set args=
+
+REM By default, give dx a max heap size of 1 gig and a stack size of 1meg.
+rem This can be overridden by using "-JXmx..." and "-JXss..." options below.
+set defaultXmx=-Xmx1024M
+set defaultXss=-Xss1m
+
+REM Capture all arguments that are not -J options.
+REM Note that when reading the input arguments with %1, the cmd.exe
+REM automagically converts --name=value arguments into 2 arguments "--name"
+REM followed by "value". Dx has been changed to know how to deal with that.
+set params=
+
+:firstArg
+if [%1]==[] goto endArgs
+set a=%~1
+
+    if [%defaultXmx%]==[] goto notXmx
+    if %a:~0,5% NEQ -JXmx goto notXmx
+        set defaultXmx=
+    :notXmx
+
+    if [%defaultXss%]==[] goto notXss
+    if %a:~0,5% NEQ -JXss goto notXss
+        set defaultXss=
+    :notXss
+
+    if %a:~0,2% NEQ -J goto notJ
+        set javaOpts=%javaOpts% -%a:~2%
+        shift /1
+        goto firstArg
+
+    :notJ
+    set params=%params% %1
+    shift /1
+    goto firstArg
+
+:endArgs
+
+set javaOpts=%javaOpts% %defaultXmx% %defaultXss%
+
+call "%java_exe%" %javaOpts% -Djava.ext.dirs="%frameworkdir%" -jar "%jarpath%" %params%
+
+goto :EOF
+
+:badArgs
+echo Usage:   dx (for Qt) <android_sdk_path> <dx_arguments>
+echo Example: dx (for Qt) C:\android-sdk --dex --output=target.jar .classes
+

mkspecs/features/java.prf

@@ -50,7 +50,11 @@ QMAKE_EXTENSION_SHLIB = jar
 # Override linker with dex (for Android) or jar (for other java builds)
 android {
     QMAKE_LINK_O_FLAG = --output=
+    contains(QMAKE_HOST.os, Windows) {
+        QMAKE_LINK = $$PWD/data/android/dx $$SDK_ROOT --dex
+    } else {
         QMAKE_LINK = $$SDK_ROOT/platform-tools/dx --dex
+    }
 } else {
     QMAKE_LINK_O_FLAG = "cf "
     QMAKE_LINK = jar