Re: [eigen] Alignment issues

[Christoph Hertzberg <chtz@xxxxxxxxxxxxxxxxxxxxxxxx>]

On 13.02.2014 15:01, Christoph Hertzberg wrote:
> On 13.02.2014 14:42, Nicola Gigante wrote:
> > In fact, code that you warn the user about in the documentation seems
> > to actually work in the same way:
> > class B {
> >      char c;
> >      Vector4f a;
> > };
>
> With the above, could you try:
>
> #include <vector>
> #include <iostream>
>
> int main() {
>      B* b = new B;
>      B* b_arr = new B[10];
>      std::vector<B> b_vec(10);
>
>      std::cout << b << "\n" << b_arr << "\n" << b_vec.data() << std::endl;
> }
>
> These are basically the things that used to get wrong. Maybe those have
> been fixed by now, but they all fail on my gcc4.7 and clang3.1 on 32bit
> Linux.
> gcc does not even like the alignas(16) syntax (clang accepts it, but it
> does not influence the outcome).

Addendum:
Gael reported a bug related to that here:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53900
The conclusion was that this is rather a bug in libstdc++ (still we need 
to work-around it)

Christoph




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Dipl.-Inf., Dipl.-Math. Christoph Hertzberg
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