https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90452
Bug ID: 90452
Summary: no warning for misaligned pointer to #pragma-pack'ed
fields
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: amonakov at gcc dot gnu.org
Target Milestone: ---
GCC 9 introduced a new warning (-Waddress-of-packed-member) for situations
where the code tries to assign address of an under-aligned struct field to a
normal pointer (which should point to a properly aligned object).
However, the new warning doesn't trigger if unaligned fields appear under
#pragma pack (although funny that it works fine when -fpack-struct is given on
the command line):
#pragma pack(push,1)
struct
//__attribute__((packed))
s {
char c;
long l;
} *s;
#pragma pack(pop)
long *f()
{
return &s->l;
}
