https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109824
Bug ID: 109824
Summary: aligned attribute lost on first usage
Product: gcc
Version: 12.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: stsp at users dot sourceforge.net
Target Milestone: ---
Created attachment 55063
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55063&action=edit
test case
struct a {
short aa;
};
typedef struct a less_aligned_a __attribute__ ((aligned (1)));
static inline void foo(void)
{
#ifndef BUG
struct a aa __attribute__((unused));
#endif
}
class t1 {
less_aligned_a i;
public:
less_aligned_a &get_ref() {
return i;
}
} __attribute__((packed));
t1 ap;
less_aligned_a* a = &ap.get_ref();
-----
$ g++ -Wall -c a.cpp
a.cpp: In instantiation of ‘less_aligned_a& t1<T>::get_ref() [with T = int;
less_aligned_a = a]’:
a.cpp:23:32: required from here
a.cpp:18:16: error: cannot bind packed field ‘((t1<int>*)this)->t1<int>::i’ to
‘less_aligned_a&’ {aka ‘a&’}
18 | return i;
But comment out the line 9 under "ifndef BUG"
and it compiles without an error.
