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How can I identify the processor that is running the application so I could execute a fragment of code only if it’s running on a G4? –Angel Puerto

Do you want to know if it is Altivec enabled?

#include <sys/sysctl.h>

boolean_t IsG4() { host_basic_info_data_t hostInfo; mach_msg_type_number_t infoCount;

kern_return_t ret = host_info(mach_host_self(), HOST_BASIC_INFO, (host_info_t)&hostInfo, &infoCount);

return (KERN_SUCCESS == ret && (hostInfo.cpu_type == CPU_TYPE_POWERPC) && (hostInfo.cpu_subtype == CPU_SUBTYPE_POWERPC_7400 || hostInfo.cpu_subtype == CPU_SUBTYPE_POWERPC_7450)); }                                       

boolean_t IsAltiVecAvailable() { int name[2] = { CTL_HW, HW_VECTORUNIT }; int hasVectorUnit = 0;

size_t length = sizeof(hasVectorUnit);
int err = sysctl(name, 2, &hasVectorUnit, &length, NULL, 0);

return (0 == err && 0 != hasVectorUnit); }

Or, you could simply send gestaltNativeCPUType to Gestalt(). It will return gestaltCPUG3, gestaltCPUG4, gestaltCPUG5, yada yada yada…

ADC recommends the sysctl method for mach-o executables, Gestalt for Classic or CFM Carbon.

That makes sense. The sysctl interface should be more stable than Gestalt. Only depend on it if you are already.

type sysctl -A in the terminal to see what else you can find out.