Good morning! I have ported an application to GNUstep (from MacOS) and everything works very well on a ubuntu 12.04 LTS (32-bit).
However, the same port fails under 12.04 LTS (64-bit) for a simple reason: On GNUstep the NSAllocateObject function (and therefore all the alloc methods) do _not_ return 16 bytes aligned objects. On Linux, the objects are always 8 bytes aligned. I checked, and my code on Cocoa (MacOS 10.8.4) [the same call to NSAllocateObject] returns 16 bytes aligned objects. Either this is a bug, or I'm missing a macro/define somewhere to tell GNUstep I'd like to have 16 bytes aligned objects. Naturally, I can redefine a new method for the meta-class whose instances require a 16 byte alignment, but this is ad-hoc and would be required for every object susceptible of storing a structure expecting 16 bytes alignments. Note that the structure whose field require a 16 byte alignment and which is hosted in instances of that specific class is correctly tagged with a clang attribute to require that the structure start address be correctly aligned. Of course, that _assumes_ that the object itself is 16 bytes aligned which is not the case here. Is there a suitable incantation to get a 16-byte alignment on Linux64 ? Do you agree that this is a bug ? Thanks for your help, All the best, -- Laurent
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