Re: 64bit GNUstep Was: Problem with Cenon

[Chan Maxthon]

Actually, it was 4-way: 32-bit x86, amd64, 32-bit PowerPC and to some extent 
64-bit PowerPC.

发自我的 iPad

在 2013-1-27，19:35，Ivan Vučica <address@hidden> 写道：

> On 26. 1. 2013., at 14:10, Fred Kiefer <address@hidden> wrote:
> 
>> Apple allows the code to use 32bit versions of the core bundles even on 
>> 64bit system. I don't know how they do it exactly, most likely they have two 
>> versions of the library and link in the correct one depending on the 
>> settings.
> 
> Just a bit of info here.
> 
> Same tech that was used during PowerPC transition: universal binaries. An 
> executable is checked to see if it has 32bit, 64bit or 32+64bit code. Correct 
> version is picked; that is, 64bit code if it exists and without further 
> configuration. After that, any shared library that dyld loads will load 
> appropriate version of code from the universal binary (or the single arch 
> binary), or fail if adequate version is not found in the shared library.
> 
> With Xcode 3.2.6, which I believe was the last build to ship PPC support, one 
> could ship three-arch executables, and to my knowledge Snow Leopard included 
> three-arch binaries in all frameworks: one for Rosetta, one for 32-bit and 
> one for 64-bit. Fun!
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