Date: Tue, 19 Feb 2013 14:11:39 +0100 From: Borja Marcos <borjam@sarenet.es> To: freebsd-hackers@freebsd.org Subject: Stupid question about integer sizes Message-ID: <77B93E04-9254-4EF1-8BDB-ED9214CEC2BC@sarenet.es>
next in thread | raw e-mail | index | archive | help
Hello,
I'm really sorry if this is a stupid question, but as far as I know, =
u_int64_t defined in /usr/include/sys/types.h should *always* be
a 64 bit unsigned integer, right?=20
Seems there's a bug (or I need more and stronger coffee). Compiling a =
program on a 64 bit system with -m32 gets the 64 bit integer types =
wrong.
% cat tachin.c=20
#include <sys/types.h>
#include <stdio.h>
main()
{
printf("sizeof uint64_t =3D %d\n", sizeof(uint64_t));
printf("sizeof u_int64_t =3D %d\n", sizeof(u_int64_t));
}
uname -a
FreeBSD splunk 9.1-RELEASE FreeBSD 9.1-RELEASE #14: Wed Jan 23 17:24:05 =
CET 2013 root@splunk:/usr/obj/usr/src/sys/SPLUNK amd64
% gcc -o tachin tachin.c
% ./tachin
sizeof uint64_t =3D 8
sizeof u_int64_t =3D 8
% ./tachin
sizeof uint64_t =3D 4 <=3D=3D=3D=3D=3D=3D=3D =
WRONG!!
sizeof u_int64_t =3D 4 <=3D=3D=3D=3D=3D=3D=3D WRONG!!
The same happens with clang.
% clang -m32 -o tachin tachin.c
tachin.c:5:1: warning: type specifier missing, defaults to 'int' =
[-Wimplicit-int]
main()
^~~~
1 warning generated.
% ./tachin
sizeof uint64_t =3D 4 <=3D=3D=3D=3D=3D=3D=3D WRONG!!
sizeof u_int64_t =3D 4 <=3D=3D=3D=3D=3D=3D=3D WRONG!!
if I do the same on a i386 system (8.2-RELEASE, but it should be =
irrelevant) the u_int64 types have the correct size.
%gcc -o tachin tachin.c
%./tachin
sizeof uint64_t =3D 8
sizeof u_int64_t =3D 8
Am I missing anything? Seems like a too stupid problem to be a real bug. =
Sorry if I am wrong.
Borja.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?77B93E04-9254-4EF1-8BDB-ED9214CEC2BC>