topic Re: Finding 32 bit or 64 in Operating System - HP-UX

Finding 32 bit or 64

yatin — Fri, 02 Apr 2004 04:44:16 GMT

I am writing ver simple helloworld like program .How can i detect whether i am compiling it for 32bit or 64 bit i tried LP64 bu it dint work here is the code

include

#ifdef LP64
#define var 64
#endif

#ifndef LP64
#define var 32
#endif

void main()
{
printf("%d",var);
}

Re: Finding 32 bit or 64

H.Merijn Brand (procura — Fri, 02 Apr 2004 05:26:25 GMT

if (sizeof (int *) == 8) {
printf ("64 bit\n");
}
else {
print "32bit\n";
}

cpp symbols you could look for are

_FILE_OFFSET_BITS
_ILP32
_LFS64_LARGEFILE

And as long as you don't state which compiler you use, it's pretty hard to guess what cpp symbols are defined. gcc has a different set of symbols as HP's C-ANSI-C

Enjoy, Have FUN! H.Merijn

Re: Finding 32 bit or 64

yatin — Fri, 02 Apr 2004 05:28:23 GMT

I got it it should be __LP64__ and not LP64