4 Jun
2021
4 Jun
'21
8:26 a.m.
On Fri, 2021-06-04 at 08:13 +0000, David Laight wrote:
From: Alex Elder
Sent: 03 June 2021 22:55
...
Not necessarily, sizeof(bool) is implementation defined. And I thought you didn't think the size of the structure was very important...
It is 'implementation defined' but will be 32 bits on everything except an old 32bit ARM ABI.
Really? (x86-64)
$ gcc -x c - #include <stdio.h> #include <stdlib.h>
struct foo { _Bool b; };
int main(int argc, char **argv) { printf("sizeof _Bool: %zu\n", sizeof(_Bool)); printf("sizeof struct foo: %zu\n", sizeof(struct foo)); return 0; } $ ./a.out sizeof _Bool: 1 sizeof struct foo: 1