See:

http://www.qnx.com/developers/docs/6.3.0SP3/neutrino/lib_ref/c/confstr.h
tml 

and use _CS_ARCHITECTURE

On Wed, Apr 01, 2009 at 09:23:59AM -0400, Michael Cranston wrote:
> I am developing on two architectures, x86 and arm.
> Is there a system variable I can read at runtime to determine the platform (ARM vs x86)?


// For compile time selection....
main() {
#if defined(__X86__)
	printf("I'm an X86!\n");
#elif defined(__ARM__)
	printf("I'm an ARM!\n");
#else
	printf("I'm something else!\n");
#endif
}

// For run time selection....
#include <sys/syspage.h>
main() {
	switch(_syspage_ptr->type) {
	case SYSPAGE_X86:
		printf("I'm an X86!\n");
		break;
	case SYSPAGE_ARM:
		printf("I'm an ARM!\n");
		break;
	default:
		printf("I'm something else!\n");
		break;
	}
}
		
-- 
Brian Stecher (bstecher@qnx.com)        QNX Software Systems
phone: +1 (613) 591-0931 (voice)        175 Terence Matthews Cr.
       +1 (613) 591-3579 (fax)          Kanata, Ontario, Canada K2M 1W8

On Wed, Apr 01, 2009 at 09:24:02AM -0400, Michael Cranston wrote:
> Hello, 
> 
> I am developing on two architectures, x86 and arm.
> Is there a system variable I can read at runtime to determine the platform (ARM vs x86)?

At compile time you can do something like:

enum arch_enum {
	ARCH_X86,
	ARCH_ARM;
};

#if defined(__X86__)
	architecture = ARCH_X86;
#elif defined(__ARM__)
	architecture = ARCH_ARM;
#else
#error unknown arch
#endif

-seanb