3 ms·

Let's not forget about the Universal Binaries (a solution for the transition to Intel) And from 68k to PPC.

• jonah 16y ago
  Weren't those called "Fat Binaries"?
  • Zev 16y ago
    A "Universal Binary" is the exact same thing as a "Fat Binary," the only difference is that marketing gave it a new name. If you look at the mach-o header of a binary that contains multiple architectures (initially, ppc/68k or now, i386/x86_64/ppc), the first 8 bytes will be either 0xcafebabe or 0xbebafeca, depending on your endianness. These values are also #define'd as FAT_MAGIC or FAT_CIGAM in <arch/fat.h>. If you're on a Mac, you can check this by typing `open -h fat.h` into a Terminal and opening up the binary of a universal app in a hex editor.
    • jonah 16y ago
      Yep. But I don't believe the 68k/PPC ones were called "Universal Binary".
      • Zev 16y ago
        If it walks like a duck and quacks like a duck... Please see the end of the first line in my previous post: ...the only difference is that marketing gave it a new name.