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Bug#641849: ICE: gcc-4.6: ICE on armhf with webkitgtk+

Package: g++-4.6
Version: 4.6.1-10
Severity: important

webkitgtk+_1.4.2-2 fails to build from source on armhf due to a gcc ICE:

http://buildd.debian-ports.org/status/fetch.php?pkg=webkitgtk%2B&arch=armhf&ver=1.4.2-2&stamp=1311782209

...
  CXX    Source/WebCore/bindings/js/libWebCore_la-SerializedScriptValue.lo
In file included from ../Source/JavaScriptCore/wtf/PassRefPtr.h:25:0,
                 from ../Source/JavaScriptCore/wtf/RefPtr.h:28,
                 from ../Source/JavaScriptCore/wtf/HashFunctions.h:24,
                 from ../Source/JavaScriptCore/wtf/HashTraits.h:24,
                 from ../Source/JavaScriptCore/runtime/JSValue.h:31,
                 from
../Source/JavaScriptCore/runtime/CachedTranscendentalFunction.h:29,
                 from ../Source/JavaScriptCore/runtime/JSGlobalData.h:32,
                 from ../Source/JavaScriptCore/interpreter/CallFrame.h:26,
                 from ../Source/JavaScriptCore/runtime/ArgList.h:25,
                 from ../Source/JavaScriptCore/runtime/JSObject.h:26,
                 from ../Source/JavaScriptCore/runtime/JSArray.h:24,
                 from ../Source/JavaScriptCore/runtime/JSGlobalObject.h:25,
                 from ../Source/WebCore/bindings/js/JSDOMGlobalObject.h:30,
                 from ../Source/WebCore/bindings/js/JSDOMBinding.h:25,
                 from ../Source/WebCore/bindings/js/ScriptValue.h:34,
                 from ../Source/WebCore/bindings/js/SerializedScriptValue.h:30,
                 from
../Source/WebCore/bindings/js/SerializedScriptValue.cpp:28:
../Source/JavaScriptCore/wtf/NullPtr.h:48:1: warning: identifier
'nullptr' will become a keyword in C++0x [-Wc++0x-compat]
In file included from ../Source/JavaScriptCore/runtime/JSObject.h:31:0,
                 from ../Source/JavaScriptCore/runtime/JSArray.h:24,
                 from ../Source/JavaScriptCore/runtime/JSGlobalObject.h:25,
                 from ../Source/WebCore/bindings/js/JSDOMGlobalObject.h:30,
                 from ../Source/WebCore/bindings/js/JSDOMBinding.h:25,
                 from ../Source/WebCore/bindings/js/ScriptValue.h:34,
                 from ../Source/WebCore/bindings/js/SerializedScriptValue.h:30,
                 from
../Source/WebCore/bindings/js/SerializedScriptValue.cpp:28:
../Source/JavaScriptCore/runtime/JSCell.h: In member function 'void*
JSC::MarkedBlock::allocate()':
../Source/JavaScriptCore/runtime/JSCell.h:380:78: warning: cast from
'char (*)[8]' to 'JSC::JSCell*' increases required alignment of target
type [-Wcast-align]
In file included from ../Source/JavaScriptCore/collector/handles/Handle.h:29:0,
                 from
../Source/JavaScriptCore/collector/handles/HandleHeap.h:30,
                 from ../Source/JavaScriptCore/runtime/Heap.h:25,
                 from ../Source/JavaScriptCore/runtime/JSGlobalData.h:33,
                 from ../Source/JavaScriptCore/interpreter/CallFrame.h:26,
                 from ../Source/JavaScriptCore/runtime/ArgList.h:25,
                 from ../Source/JavaScriptCore/runtime/JSObject.h:26,
                 from ../Source/JavaScriptCore/runtime/JSArray.h:24,
                 from ../Source/JavaScriptCore/runtime/JSGlobalObject.h:25,
                 from ../Source/WebCore/bindings/js/JSDOMGlobalObject.h:30,
                 from ../Source/WebCore/bindings/js/JSDOMBinding.h:25,
                 from ../Source/WebCore/bindings/js/ScriptValue.h:34,
                 from ../Source/WebCore/bindings/js/SerializedScriptValue.h:30,
                 from
../Source/WebCore/bindings/js/SerializedScriptValue.cpp:28:
../Source/JavaScriptCore/runtime/WriteBarrier.h: In member function
'T* JSC::WriteBarrierBase<T>::get() const [with T =
JSC::JSGlobalObject]':
../Source/JavaScriptCore/runtime/ScopeChain.h:76:86:   instantiated from here
../Source/JavaScriptCore/runtime/WriteBarrier.h:97:56: warning: cast
from 'JSC::JSCell*' to 'JSC::JSGlobalObject*' increases required
alignment of target type [-Wcast-align]
../Source/JavaScriptCore/runtime/WriteBarrier.h: In member function
'T* JSC::WriteBarrierBase<T>::get() const [with T =
JSC::ObjectPrototype]':
../Source/JavaScriptCore/runtime/JSGlobalObject.h:185:81:
instantiated from here
../Source/JavaScriptCore/runtime/WriteBarrier.h:97:56: warning: cast
from 'JSC::JSCell*' to 'JSC::ObjectPrototype*' increases required
alignment of target type [-Wcast-align]
../Source/JavaScriptCore/runtime/WriteBarrier.h: In member function
'T* JSC::WriteBarrierBase<T>::get() const [with T =
JSC::StringPrototype]':
../Source/JavaScriptCore/runtime/JSGlobalObject.h:189:81:
instantiated from here
../Source/JavaScriptCore/runtime/WriteBarrier.h:97:56: warning: cast
from 'JSC::JSCell*' to 'JSC::StringPrototype*' increases required
alignment of target type [-Wcast-align]
../Source/JavaScriptCore/runtime/WriteBarrier.h: In member function
'T* JSC::WriteBarrierBase<T>::get() const [with T =
JSC::NumberPrototype]':
../Source/JavaScriptCore/runtime/JSGlobalObject.h:190:81:
instantiated from here
../Source/JavaScriptCore/runtime/WriteBarrier.h:97:56: warning: cast
from 'JSC::JSCell*' to 'JSC::NumberPrototype*' increases required
alignment of target type [-Wcast-align]
In file included from
../Source/JavaScriptCore/collector/handles/HandleHeap.h:30:0,
                 from ../Source/JavaScriptCore/runtime/Heap.h:25,
                 from ../Source/JavaScriptCore/runtime/JSGlobalData.h:33,
                 from ../Source/JavaScriptCore/interpreter/CallFrame.h:26,
                 from ../Source/JavaScriptCore/runtime/ArgList.h:25,
                 from ../Source/JavaScriptCore/runtime/JSObject.h:26,
                 from ../Source/JavaScriptCore/runtime/JSArray.h:24,
                 from ../Source/JavaScriptCore/runtime/JSGlobalObject.h:25,
                 from ../Source/WebCore/bindings/js/JSDOMGlobalObject.h:30,
                 from ../Source/WebCore/bindings/js/JSDOMBinding.h:25,
                 from ../Source/WebCore/bindings/js/ScriptValue.h:34,
                 from ../Source/WebCore/bindings/js/SerializedScriptValue.h:30,
                 from
../Source/WebCore/bindings/js/SerializedScriptValue.cpp:28:
../Source/JavaScriptCore/collector/handles/Handle.h: In static member
function 'static T* JSC::HandleTypes<T>::getFromSlot(JSC::HandleSlot)
[with T = WebCore::DOMObject, JSC::HandleTypes<T>::ExternalType =
WebCore::DOMObject*, JSC::HandleSlot = JSC::JSValue*]':
../Source/JavaScriptCore/runtime/WeakGCPtr.h:59:74:   instantiated
from 'JSC::WeakGCPtr<T>::ExternalType JSC::WeakGCPtr<T>::get() const
[with T = WebCore::DOMObject, JSC::WeakGCPtr<T>::ExternalType =
WebCore::DOMObject*]'
../Source/WebCore/bindings/js/ScriptWrappable.h:47:30:   instantiated from here
../Source/JavaScriptCore/collector/handles/Handle.h:94:130: warning:
cast from 'JSC::JSCell*' to
'JSC::HandleTypes<WebCore::DOMObject>::ExternalType {aka
WebCore::DOMObject*}' increases required alignment of target type
[-Wcast-align]
../Source/WebCore/bindings/js/SerializedScriptValue.cpp: In member
function 'void WebCore::CloneSerializer::write(double)':
../Source/WebCore/bindings/js/SerializedScriptValue.cpp:499:5:
internal compiler error: in simplify_gen_subreg_concatn, at
lower-subreg.c:489
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.6/README.Bugs> for instructions.

I used the delta package to produce a minimal testcase for the ICE
which I attach.
You can reproduce the ICE with g++ -O2 -fpermissive -Wfatal-errors -w
webkit_testcase-min.i.

Thanks

Konstantinos

Attachment: webkit_testcase-min.i
Description: Binary data

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