https://gcc.gnu.org/bugzilla/show_bug.cgi?id=41809
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |msebor at gcc dot gnu.org
--- Comment #7 from Martin Sebor <msebor at gcc dot gnu.org> ---
Starting with version 9 GCC diagnoses both calls in the test case in comment #0
(the test case with #pragma pack in comment #3 is not diagnosed):
$ cat pr41809.c && gcc -O2 -S -Wall pr41809.c
void f(int *);
struct s {
int x;
char c;
} __attribute__((__packed__));
struct s A[10];
int main(void)
{
for (int i = 0; i != sizeof(A)/sizeof(A[0]); ++i) {
f(&A[i].x);
f((int*)(char*)&A[i].x);
}
}
pr41809.c: In function ‘main’:
pr41809.c:13:11: warning: taking address of packed member of ‘struct s’ may
result in an unaligned pointer value [-Waddress-of-packed-member]
13 | f(&A[i].x);
| ^~~~~~~
pr41809.c:14:11: warning: taking address of packed member of ‘struct s’ may
result in an unaligned pointer value [-Waddress-of-packed-member]
14 | f((int*)(char*)&A[i].x);
| ^~~~~~~~~~~~~~~~~~~~
