support for cross building Qt for MinGW (win32-g++) on Unix

This changeset provides the basis for targetting win32-g++ on Unix using
the configure shell script:
   support added to the configure script itself
   support added to relevant config.tests
   support added to mingw makefile generator in qmake
   new makespec: unsupported/win32-g++-cross
The makespec is based on the win32-g++ makespec.

Merge-request: 2407
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>

2 files changed, 143 insertions, 0 deletions

diff --git a/mkspecs/unsupported/win32-g++-cross/qmake.conf b/mkspecs/unsupported/win32-g++-cross/qmake.conf
new file mode 100644
index 0000000..e338a22
--- /dev/null
+++ b/mkspecs/unsupported/win32-g++-cross/qmake.conf
@@ -0,0 +1,101 @@
+#
+# qmake configuration for win32-g++-cross
+#
+# Written for MinGW cross building on Unix
+#
+
+MAKEFILE_GENERATOR	= MINGW
+TEMPLATE		= app
+CONFIG			+= qt warn_on release link_prl copy_dir_files debug_and_release debug_and_release_target precompile_header
+QT			+= core gui
+DEFINES			+= UNICODE QT_LARGEFILE_SUPPORT
+QMAKE_COMPILER_DEFINES  += __GNUC__ WIN32
+
+QMAKE_EXT_OBJ           = .o
+QMAKE_EXT_RES           = _res.o
+
+QMAKE_CC		= i686-pc-mingw32-gcc
+QMAKE_LEX		= flex
+QMAKE_LEXFLAGS		=
+QMAKE_YACC		= byacc
+QMAKE_YACCFLAGS		= -d
+QMAKE_CFLAGS		= -pipe
+QMAKE_CFLAGS_DEPS	= -M
+QMAKE_CFLAGS_WARN_ON	= -Wall
+QMAKE_CFLAGS_WARN_OFF	= -w
+QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_DEBUG	= -g
+QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
+
+QMAKE_CXX		= i686-pc-mingw32-g++
+QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS
+QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
+QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
+QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
+QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
+QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
+QMAKE_CXXFLAGS_YACC	= $$QMAKE_CFLAGS_YACC
+QMAKE_CXXFLAGS_THREAD	= $$QMAKE_CFLAGS_THREAD
+QMAKE_CXXFLAGS_RTTI_ON	= -frtti
+QMAKE_CXXFLAGS_RTTI_OFF	= -fno-rtti
+QMAKE_CXXFLAGS_EXCEPTIONS_ON = -fexceptions -mthreads
+QMAKE_CXXFLAGS_EXCEPTIONS_OFF = -fno-exceptions
+
+QMAKE_INCDIR		=
+QMAKE_INCDIR_QT		= $$[QT_INSTALL_HEADERS]
+QMAKE_LIBDIR_QT		= $$[QT_INSTALL_LIBS]
+
+QMAKE_RUN_CC		= $(CC) -c $(CFLAGS) $(INCPATH) -o $obj $src
+QMAKE_RUN_CC_IMP	= $(CC) -c $(CFLAGS) $(INCPATH) -o $@ $<
+QMAKE_RUN_CXX		= $(CXX) -c $(CXXFLAGS) $(INCPATH) -o $obj $src
+QMAKE_RUN_CXX_IMP	= $(CXX) -c $(CXXFLAGS) $(INCPATH) -o $@ $<
+
+QMAKE_LINK		= i686-pc-mingw32-g++
+QMAKE_LINK_C		= i686-pc-mingw32-gcc
+QMAKE_LFLAGS		= -enable-stdcall-fixup -Wl,-enable-auto-import -Wl,-enable-runtime-pseudo-reloc
+QMAKE_LFLAGS_EXCEPTIONS_ON = -mthreads -Wl
+QMAKE_LFLAGS_EXCEPTIONS_OFF =
+QMAKE_LFLAGS_RELEASE	= -Wl,-s
+QMAKE_LFLAGS_DEBUG	=
+QMAKE_LFLAGS_CONSOLE	= -Wl,-subsystem,console
+QMAKE_LFLAGS_WINDOWS	= -Wl,-subsystem,windows
+QMAKE_LFLAGS_DLL        = -shared
+QMAKE_LINK_OBJECT_MAX	= 10
+QMAKE_LINK_OBJECT_SCRIPT= object_script
+
+
+QMAKE_LIBS		=
+QMAKE_LIBS_CORE         = -lkernel32 -luser32 -lshell32 -luuid -lole32 -ladvapi32 -lws2_32
+QMAKE_LIBS_GUI          = -lgdi32 -lcomdlg32 -loleaut32 -limm32 -lwinmm -lwinspool -lws2_32 -lole32 -luuid -luser32 -ladvapi32
+QMAKE_LIBS_NETWORK      = -lws2_32
+QMAKE_LIBS_OPENGL       = -lopengl32 -lglu32 -lgdi32 -luser32
+QMAKE_LIBS_COMPAT       = -ladvapi32 -lshell32 -lcomdlg32 -luser32 -lgdi32 -lws2_32
+QMAKE_LIBS_QT_ENTRY     = -lmingw32 -lqtmain
+
+QMAKE_SH		= bash
+
+MINGW_IN_SHELL		= 1
+QMAKE_DIR_SEP		= /
+QMAKE_COPY		= cp
+QMAKE_COPY_DIR		= cp -r
+QMAKE_MOVE		= mv
+QMAKE_DEL_FILE		= rm -f
+QMAKE_MKDIR		= mkdir -p
+QMAKE_DEL_DIR		= rmdir
+QMAKE_SYMBOLIC_LINK	= ln -s
+QMAKE_CHK_DIR_EXISTS	= test -d
+
+#QMAKE_IDC		= i686-pc-mingw32-idc
+QMAKE_MOC		= i686-pc-mingw32-moc
+QMAKE_RCC		= i686-pc-mingw32-rcc
+QMAKE_UIC		= i686-pc-mingw32-uic
+
+#QMAKE_IDL		= midl
+QMAKE_LIB		= i686-pc-mingw32-ar -ru
+QMAKE_RC		= i686-pc-mingw32-windres
+QMAKE_ZIP		= zip -r -9
+
+QMAKE_STRIP		= i686-pc-mingw32-strip
+QMAKE_STRIPFLAGS_LIB 	+= --strip-unneeded
+PKG_CONFIG		= i686-pc-mingw32-pkg-config
+load(qt_config)
diff --git a/mkspecs/unsupported/win32-g++-cross/qplatformdefs.h b/mkspecs/unsupported/win32-g++-cross/qplatformdefs.h
new file mode 100644
index 0000000..309e24a
--- /dev/null
+++ b/mkspecs/unsupported/win32-g++-cross/qplatformdefs.h
@@ -0,0 +1,42 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the qmake spec of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "../../win32-g++/qplatformdefs.h"