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From: Louis Valence <lvalence@example.com>
Newsgroups: comp.lang.c
Subject: on gdb's sizeof versus gcc's sizeof
Date: Wed, 25 Sep 2019 22:03:57 -0300
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Xref: csiph.com comp.lang.c:146345

Can you explain this?  I don't get it.

%cat sizeof-long.c
#include <stdio.h>

int main() {
  printf("sizeof unsigned long: %ld\n", sizeof (unsigned long));
  printf("sizeof long: %ld\n", sizeof (long));
}

%./sizeof-long
sizeof unsigned long: 8
sizeof long: 8

%gdb
GNU gdb (Ubuntu 8.0.1-0ubuntu1) 8.0.1

[...]

(gdb) p sizeof (unsigned long)
$1 = 4
(gdb) p sizeof (long)
$2 = 4
(gdb)

%uname -a
Linux e 4.13.0-21-generic #24-Ubuntu SMP Mon Dec 18 17:29:16 UTC 2017 \
  x86_64 x86_64 x86_64 GNU/Linux

%lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 17.10
Release:        17.10
Codename:       artful
%