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 <[email protected]> 写道： > On 26. 1. 2013., at 14:10, Fred Kiefer <[email protected]> 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! > _______________________________________________ > Gnustep-dev mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/gnustep-dev _______________________________________________ Gnustep-dev mailing list [email protected] https://lists.gnu.org/mailman/listinfo/gnustep-dev
