https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100370
Bug ID: 100370
Summary: [11.1.0 regression] Incorrect warning for placement
new
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: foldy at rmki dot kfki.hu
Target Milestone: ---
With g++ 11.1.0:
tmp> cat test.cc
#include <new>
int main()
{
struct s1 { int iv[4]; };
struct s2 { union { char* cp; int* ip; }; };
s2 b;
b.ip=new int[8];
new (b.ip+4) s1;
}
tmp> g++ -c test.cc
test.cc: In function 'int main()':
test.cc:10:12: warning: placement new constructing an object of type
'main()::s1' and size '16' in a region of type 'main()::s2' and size '0'
[-Wplacement-new=]
10 | new (b.ip+4) s1;
| ~~~~^~
test.cc:8:6: note: at offset 16 from 'b' declared here
8 | s2 b;
| ^
g++ 10.2.1 is OK.
