On Jul 29, 2008, at 8:44 PM, Steve Christensen wrote:
On Jul 29, 2008, at 12:56 PM, Jack Skellington wrote:
Is there a way to determine if an App is running on Intel or PPC
from within the App?
Depending on what you're trying to do, you can go at least a couple
routes at build time.
If you only care about endianness:
#ifdef __BIG_ENDIAN__
#ifdef __LITTLE_ENDIAN__
If you care about the actual architecture:
#ifdef __ppc__ // 32-bit PPC
#ifdef __ppc64__ // 64-bit PPC
#ifdef __i386__ // 32-bit Intel
#ifdef __x86_64__ // 64-bit Intel
There are also parallel ones defined in /usr/include/
TargetConditionals.h:
#if TARGET_RT_LITTLE_ENDIAN
#if TARGET_RT_BIG_ENDIAN
#if TARGET_CPU_PPC
#if TARGET_CPU_PPC64
#if TARGET_CPU_X86
#if TARGET_CPU_X86_64
Note that all of these detect the compile-time targeted architecture.
In rare case (e.g. Rosetta), this may be different than the actual
architecture of the machine at runtime. Generally, you probably don't
care. (A PPC binary running on an Intel Mac should probably not do
anything differently than it would on a real PPC Mac.)
If you do care, see this:
http://developer.apple.com/documentation/MacOSX/Conceptual/universal_binary/universal_binary_exec_a/chapter_950_section_7.html
That describes a technique using the sysctl API. That API can also be
used to determine lots of other aspects of the runtime environment, too.
Cheers,
Ken
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