Re: [GD-Windows] LNK1179: duplicate COMDAT (templates, vc2003)
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Re: [GD-Windows] LNK1179: duplicate COMDAT (templates, vc2003)
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From: Dan T. <da...@ar...> - 2007-03-23 00:46:54
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Does it go away if you turn off COMDAT folding? We had an issue where a
tutorial system was using the function pointer as a resource, and the
comdat system folded several functions into one, breaking it. Different
bug, but we had to turn off the folding for it.
Does anyone know how much gain you get from it, anyway?
-Dan
Jon Watte wrote:
> And the ACTUAL error, for those of who you need such things, is:
>
> media fatal error LNK1179: invalid or corrupt file: duplicate COMDAT
> '?Access@?$FieldArrayAccessor@USasCamera@impl_DX9@@M$GIA@A@A@@impl_DX9@@QAEPBMABUSasCamera@2@@Z'
>
>
> Cheers,
>
> / h+
>
>
> Jon Watte wrote:
>
>> We're using VC 2003 (can't upgrade to 2005 just yet, although it's on
>> the long-term map).
>>
>> When building a certain file, which uses some moderately simple
>> templates, I get a linker error about duplicate COMDAT sections for a
>> specific template instantiation. It seems as if the function in question
>> is being instantiated twice in the same obj file by the compiler.
>>
>> Googling for this turns up a bunch of errors in VC6, which have nothing
>> to do with this problem, and a few people who had problems with some bg
>> in the incremental linker. I've turned off incremental linking for this
>> library (I'm building a DLL), and the error still happens.
>>
>>
>> I'm looking for the following things:
>>
>> 1) A fix for a known problem.
>> 2) Suggestions for how to work around this problem.
>> 3) A drinking buddy who has the same problem and can relate to the sorrow.
>>
>>
>> The code looks somewhat like:
>>
>> namespace impl_DX9 {
>>
>> template<typename Container, typename Type, Type (Container::*Field)[]>
>> class FieldArrayAccessor {
>> public:
>> typedef Container ContainerType;
>> typedef Type FieldType;
>> Type const *Access(Container const &c) { return c.*Field; }
>> };
>>
>> // Match SasCamera
>> struct SasCamera {
>> Mat4Float worldtoview; // will always be the identity transform
>> Mat4Float projection;
>> float nearfarclipping[2];
>> FastTriple position; // because the camera is always the
>> center of the world view, it's always 0,0,0
>> };
>>
>>
>> I have tried making the Access() functions be inline static, and regular
>> static as well (in fact, they started life out being inline static); I
>> still get this error.
>>
>> The three uses of the template in the file look like this:
>>
>>
>> return new WholeArraySetter<FieldArrayAccessor<
>> SasCamera, float, reinterpret_cast<float
>> (SasCamera::*)[]>(&SasCamera::nearfarclipping)>
>> >(pb, cam, 2);
>>
>> setter_ = new ArrayItemSetter<FieldArrayAccessor<
>> SasCamera, float, reinterpret_cast<float
>> (SasCamera::*)[]>(&SasCamera::nearfarclipping)>
>> > (this, core_->camera_, l);
>>
>> setter_ = new WholeArraySetter<FieldArrayAccessor<
>> SasSkeleton, pit::Mat4Float, reinterpret_cast<pit::Mat4Float
>> (SasSkeleton::*)[]>(
>> &SasSkeleton::meshtojointtoworld)> >(this, core_->skeleton_,
>> &core_->skeleton_.get().numjoints);
>>
>>
>> The templates that invoke the actual instance (Access function) look
>> like (look at the Update() functions):
>>
>> template<typename Accessor>
>> class WholeArraySetter : public IValueSetter {
>> public:
>> // When the count is fixed, stuff it in a member, and point the
>> pointer at that.
>> WholeArraySetter(ParameterBinder *bind, DirtyState<typename
>> Accessor::ContainerType> const &ds, int cnt)
>> : bind_(bind), ds_(ds), cnt_(cnt) { cntptr_ = &cnt_; }
>> // When the count is variable, bind using a pointer. The 'cnt' is
>> not used.
>> WholeArraySetter(ParameterBinder *bind, DirtyState<typename
>> Accessor::ContainerType> const &ds, int const *cnt)
>> : bind_(bind), ds_(ds), cntptr_(cnt) { cnt_ = -1; }
>> virtual void Dispose() { delete this; }
>>
>> virtual HRESULT Update(ID3DXEffect *fx) {
>> if (!ds_.dirty()) {
>> return S_OK;
>> }
>> //later: handle type casting (float->int, etc).
>> return fx->SetValue(bind_->param_, Accessor().Access(ds_.get()),
>> sizeof(typename Accessor::FieldType) * *cntptr_);
>> }
>>
>> ParameterBinder *bind_;
>> DirtyState<typename Accessor::ContainerType> const &ds_;
>> int cnt_;
>> int const *cntptr_;
>> };
>>
>> template<typename Accessor>
>> class ArrayItemSetter : public IValueSetter {
>> public:
>> // When the count is fixed, stuff it in a member, and point the
>> pointer at that.
>> ArrayItemSetter(ParameterBinder *bind, DirtyState<typename
>> Accessor::ContainerType> const &ds, int cnt)
>> : bind_(bind), ds_(ds), cnt_(cnt) {}
>> virtual void Dispose() { delete this; }
>>
>> virtual HRESULT Update(ID3DXEffect *fx) {
>> if (!ds_.dirty()) {
>> return S_OK;
>> }
>> //later: handle type casting (float->int, etc).
>> return fx->SetValue(bind_->param_, Accessor().Access(ds_.get()) +
>> cnt_,
>> sizeof(typename Accessor::FieldType));
>> }
>>
>> ParameterBinder *bind_;
>> DirtyState<typename Accessor::ContainerType> const &ds_;
>> int cnt_;
>> };
>>
>>
>>
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>
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