Qt fails to build on linux/sparc64 due to issues in the atomic code

Qt fails to build on linux/sparc64 with the following problem:
g++ -c -m64 -pipe -I/usr/include/freetype2 -I/usr/include/dbus-1.0 -I/usr/lib/sparc64-linux-gnu/dbus-1.0/include -O2 -fvisibility=hidden -fvisibility-inlines-hidden -Wall -W -D_REENTRANT -fPIC -DQT_SHARED -DQT_BUILD_DBUS_LIB -DDBUS_API_SUBJECT_TO_CHANGE -DQT_LINKED_LIBDBUS -DQT_NO_CAST_TO_ASCII -DQT_ASCII_CAST_WARNINGS -DQT3_SUPPORT -DQT_MOC_COMPAT -DQT_USE_FAST_OPERATOR_PLUS -DQT_USE_FAST_CONCATENATION -DQT_NO_DEBUG -DQT_XML_LIB -DQT_CORE_LIB -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I../../mkspecs/linux-g++-64 -I. -I../../include/QtCore -I../../include/QtXml -I../../include -I../../include/QtDBus -I.rcc/release-shared -I.moc/release-shared -o .obj/release-shared/qdbusabstractadaptor.o qdbusabstractadaptor.cpp
In file included from ../../include/QtCore/qatomic_sparc.h:1:0,
from ../../include/QtCore/../../src/corelib/arch/qatomic_arch.h:78,
from ../../include/QtCore/qatomic_arch.h:1,
from ../../include/QtCore/../../src/corelib/thread/qbasicatomic.h:227,
from ../../include/QtCore/qbasicatomic.h:1,
from ../../include/QtCore/../../src/corelib/thread/qatomic.h:46,
from ../../include/QtCore/qatomic.h:1,
from ../../include/QtCore/../../src/corelib/tools/qbytearray.h:45,
from ../../include/QtCore/qbytearray.h:1,
from ../../include/QtCore/../../src/corelib/tools/qstring.h:46,
from ../../include/QtCore/qstring.h:1,
from ../../include/QtCore/../../src/corelib/kernel/qobject.h:48,
from ../../include/QtCore/qobject.h:1,
from ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:45,
from ../../include/QtCore/qcoreapplication.h:1,
from qdbusintegrator.cpp:42:
../../include/QtCore/../../src/corelib/arch/qatomic_sparc.h: In member function 'bool QBasicAtomicPointer<T>::testAndSetOrdered(T*, T*) [with T = const QString]':
qdbusintegrator.cpp:74:1: instantiated from here
../../include/QtCore/../../src/corelib/arch/qatomic_sparc.h:238:85: error: invalid conversion from 'const void*' to 'void*' [-fpermissive]
../../include/QtCore/../../src/corelib/arch/qatomic_sparc.h:131:23: error: initializing argument 2 of 'int q_atomic_test_and_set_acquire_ptr(volatile void*, void*, void*)' [-fpermissive]
../../include/QtCore/../../src/corelib/arch/qatomic_sparc.h:238:85: error: invalid conversion from 'const void*' to 'void*' [-fpermissive]
../../include/QtCore/../../src/corelib/arch/qatomic_sparc.h:131:23: error: initializing argument 3 of 'int q_atomic_test_and_set_acquire_ptr(volatile void*, void*, void*)' [-fpermissive]
make[3]: *** [.obj/release-shared/qdbusintegrator.o] Error 1

The problem is that the type of some arguments in src/corelib/arch/qatomic_sparc.h are missing a const attribute. In that case the second and third arguments of q_atomic_test_and_set_acquire_ptr() are only read in the assembly code (src/corelib/arch/sparc/qatomic64.s), so it's possible to declare them const.

This is the only thing required to get Qt building on linux/sparc64, but I preferred to also change other functions with missing const attribute, so that the same kind of problem doesn't appear again in the future. You'll find the patch as an attachement