August 2011
Intermediate to advanced
552 pages
23h 48m
English
Content preview from Advanced Mac OS X Programming: The Big Nerd Ranch GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Universally Fat Binaries
Mach-O supports “fat” files, officially called “universal” files by Apple. These let you have PowerPC, Intel, and the 32-bit and 64-bit flavors of each kind of code in the same file. This allows for a single application or a single framework to service all the computing worlds.
Fat binaries from the command line
You can use gcc on the command-line, or in makefiles, to generate object code for any of the supported architectures. You can also build the final fat binaries using these command-line tools.
gcc’s -arch flag controls which architecture(s) it should build. For Mac OS X, you can give -arch the ppc, i386, ppc64, and x86_64 flags. iOS is an ARM architecture, so you would use armv6 or armv7 if you were constructing ...
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