3 Jan
2017
3 Jan
'17
6:59 p.m.
On Tue, Jan 03, 2017 at 09:39:36am -0800, David wrote:
I’m running Yosemite, Sierra won’t run on my
hardware.
Does the standard expect an int to be a specific size? I can’t imagine this to be the
case.
On Mac ints are 32 bits, as are longs. Unlike Linux where long defaults to 64 bits.
Depends:
$ uname -a
Darwin Old-MBA.local 14.5.0 Darwin Kernel Version 14.5.0: Sun Sep 25 22:07:15 PDT 2016;
root:xnu-2782.50.9~1/RELEASE_X86_64 x86_64
$ cat size.c
#include <stdio.h>
int main()
{
printf("sz(int) = %lu, sz(long) = %lu\n",
(unsigned long)sizeof(int),
(unsigned long)sizeof(long));
return 0;
}
$ cc -o size size.c
$ ./size
sz(int) = 4, sz(long) = 8
$ file size
size: Mach-O 64-bit executable x86_64
$ cc -m32 -o size size.c
$ ./size
sz(int) = 4, sz(long) = 4
$ file size
size: Mach-O executable i386
As I recall the same applies on linux for amd64, with the size of
logn changing depending upon if one compiles as x86 or amd64.
ILP32 vs LP64
DF