https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65106
Bug ID: 65106
Summary: C99 intialization of struct with const member through
a non-const pointer
Product: gcc
Version: 4.9.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: andrii.riabushenko at barclays dot com
I noticed that such C99 code is valid in Clang, but not in GCC:
#include<stdlib.h>
struct A {
int x;
const int y;
}
struct A* make()
{
struct A *ptr = malloc(sizeof(struct A));
*ptr = (struct A) {10, 10};
}
I find this language construct rather useful. I quickly scanned the C standard
and I can't find the evidence that is actually prohibited. There is a
difference between assignment a const member (ptr->y = 10) that should be
prohibited and actual struct initialization through non-const pointer. For some
reason GCC does not distinguish these 2 cases.
